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Make Crystal Earphone/Earpiece for Crystal Radio - Homemade
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Күн бұрынHow to make a homemade crystal radio earphone (earpiece) for a crystal radio, starting from a microwave oven piezoelectric crystal speaker. This goes step-by-step, from taking it out of the microwave oven, desoldering it from the circuit board, gluing the end of a pen as a hearing tube to direct the sound into your ear, hot gluing on a back piece to capture sound from the piezoelectric crystal, and even cleaning the tube with rubbing alcohol before use. I also show how to test it using a voltmeter while tapping on the piezo crystal. Lastly, I demonstrate it in use with a homemade crystal radio.
To see how to make the homemade crystal radio used in this video, watch "How to Make/Build a Crystal Radio":
• How to Make/Build a Cr...
For crystal radio earphone tips, watch "Crystal Radio Troubleshooting and Tips":
• Crystal Radio Troubles...
And for the "Make Solar Cell Transistor Powered Calculator using 2N3055" video, see:
• Make Solar Cell Transi...
For more about crystal earphones, visit:
rimstar.org/equ...
For more about crystal radios, visit:
rimstar.org/equ...
The crystal earpiece (piezoelectric earphone) and/or 1N34 germanium diode can be orders from these sources:
www.scitoyscat...
www.maplin.co.u...
To follow me on Twitter:
#!...
rimstar.org
Music used throughout:
The Path of the Goblin King Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
creativecommons...
ISRC: USUAN1100873
@MrBrew4321 7 жыл бұрын
I had that idea for the first crystal radio I tried to make. When it failed to produce any sound I assumed the microwave piezo speaker crystal was to big or something. Now that I've made some more advanced crystal radios and seen this, I'll probably dig those old microwave parts out of a box and give it a go again. Thanks for sharing!
@RimstarOrg 11 жыл бұрын
Yes. In fact I used one of those greeting card crystals in my "Piezoelectric generator LED lit by rain water" video. But I think more and more these days the greeting cards contain electromagnetic speakers. It's a little difficult but if you go to the card store looking for them and want to know which type is in the card without tearing it apart, the electromagnetic speaker ones have a Neodymium magnet in them, so test the cards with something ferromagnetic, some keys for example.
@RimstarOrg 11 жыл бұрын
Yeah, I keep finding new things in this microwave oven. It really is a treasure trove. Took from capacitors from the board too while I was at it. Glad to hear you enjoyed the video.
@jecosad5955 5 жыл бұрын
im here because of Dr. Stone manga. You will survive the stone age, sir
@OdisseuBR 5 ай бұрын
Great reference!
@RimstarOrg 9 жыл бұрын
+Avichai Marcovitch I give two links in the video description to where you can buy crystal earpieces (piezoelectric speakers) online. PS There's no Reply button under your comment because of your Google+ settings. - go to your Google+ page, - in the top, right corner click on your thumbnail icon, - in the popup that appears, click on "Settings". - for the 2nd question down "Who can comment on your public posts?" set it to "Anyone".
@avimarc 9 жыл бұрын
RimstarOrg Thanks for the quick reply ,fixed the reply ability as well. I've been having some difficulty finding a site that can ship a crystal earphone to my country without insane costs, so i wanted to make one from a piezoelectric buzzer like in your video therefore it would be greatly appreciated if you could recommend a buzzer to use (im assuming those would be more common and easier to find a site that delivers to Israel :)
@RimstarOrg 9 жыл бұрын
Avichai Marcovitch I don't have any specific recommendation. This is the one I have and that works www.thesource.ca/estore/product.aspx?language=en-CA&catalog=Online&category=CLRBatteries_Cables&product=2730060 Probably a lot of others work too. You should be able to find one in an electronics or hardware store in Israel.
@TheKingofRandom 11 жыл бұрын
That's safer than the way I usually do it :) I think I also saw you do that in one of your previous videos? Cool Steve!
@mnpd3 5 жыл бұрын
Hey, try this.... use a resistor and short out the piezo's terminals. The value varies, but 10k to 12K seems to work best. Easiest way to determine the correct resistance is to use a low-step resistance substitution box, or a variable resistor to find the best value. Depending on your method, you may then want to read the resistance you use with the VOM. Bet you'll be surprised by the improved audio.
@TheKingofRandom 11 жыл бұрын
Cool! Thanks for the tip!
@fidel6012 4 жыл бұрын
never thought i would find tkor here but okay
@juntendo6104 4 жыл бұрын
lol only 2 likes
@hinbikie4704 10 ай бұрын
Surprising
@RimstarOrg 11 жыл бұрын
Thanks. And yup, been there done that. Of course you need something to tap or flex the crystal in order to get it to light the LED. I've even used water drops, dropping from a 4 foot height to tap on the crystal.
@matthamblin2180 Ай бұрын
I love how you re-use found objects. Especially since Radio Shacks are harder to find these days. I'd love to see a video on where and how to collect electronic components from found objects. Also a video on how to make a morse code practicing sound generator. Thanks
@alasdairwardle8427 6 жыл бұрын
Great explanation. Just found an old microwave oven at the side of the road here in Australia. Found the piezoelectric 'beeper' and removed it. I am now going to get the other bits and pieces and see if I can mke my own crystal set! I might need help from grandchildren. Thank you.
@TheKingofRandom 11 жыл бұрын
That's very creative Steve :) I built a radio just like that about 3 years ago and had great success hooking the antenna to my drain pipe on the side of the house. Would a longer antenna make the signal stronger for you?
@Cumjr 4 жыл бұрын
RIP Grant Thompson
@taherpatrawala_ 3 жыл бұрын
@@Cumjr wtf why rip?
@electronicguy4550 3 жыл бұрын
He died
@randomnotes4258 Жыл бұрын
Only 14 likes from verified
@TheKingofRandom 11 жыл бұрын
Awesome that this works isn't it! What did you use for ground? Did you run it through the ground in your wall socket?
@-p5251 3 жыл бұрын
I've found ur old days comments, :yay: Nothing much :v
@RimstarOrg 11 жыл бұрын
It was a pleasure meeting you guys too! It's rare that I meet filmmakers in person. Too bad I'm here for only a month and back to Ottawa in January otherwise we could have done some movies together if you were so inclined.
@paulocavutto3601 8 ай бұрын
This is the most difficult part to find to assemble a galena radio. Thank you so much for the tip.
@RimstarOrg 11 жыл бұрын
There are some links in the description below this video to where you can buy them online.
@bobsimmons5274 Жыл бұрын
Those elements ( unmounted ) are called "piezo benders", you can buy them separately lots of places, including digikey, quite cheap. They are used for all sorts of things including ignition generators in trigger operated barbecue starters, stove top igniters, butane cigarette lighters, air humidifiers ( they are used to boil the water with explosive sound waves ) and the Webb telescope where they are used to "nudge" the individual mirrors just a tiny fraction of an inch, to align them all perfectly.
@RimstarOrg 11 жыл бұрын
Thanks! That's yet another source of piezo crystals. Good to know. And I'm glad you like my videos! Thanks for the feedback.
@billblakovich4301 8 жыл бұрын
I watched another video of yours before and it was about the headphone speakers and the transformers, I just wanted to let you know next time you take the small transformer off a circuit board the solder side on the bottom of the board tells you which coil is which where it solders in most mocrowaves
@RimstarOrg 11 жыл бұрын
I bought a standalone plug, ones for making your own chords, and hooked up only the ground prong. Basically a one-wire extension chord. I plug that into the wall socket.
@helraiser666painkil 2 жыл бұрын
Thank you for the great tip I've thrown loads of microwaves out through the years and I have never taken one apart before like yourself and that is very clever the way you made that crystal ear piece just with a part out of a microwave and then you hot glued everything together which was very smart so the next time my microwave goes I'll definitely give that a go and I will try it out on my amateur radio equipment and see what it's like so again thanks for the tip. Stephen M3SNV 73's.
@RimstarOrg 2 жыл бұрын
Just be careful when you start digging into the side of the microwave oven area where electronics are. In most ovens, you'll see a largish electrolytic capacitor (usually at the bottom near the rear of that side) and it may still have some charge meaning it may give you a shock. Be sure to discharge the two terminals of the capacitor without touching it yourself, for example with the metal of a screwdriver or something. Having said that, none of the one's I've opened ever gave any spark when discharging it but it's best to be careful.
@Slider2732 11 жыл бұрын
Just spent ages looking for the board from the microwave I took apart...but got tons of regular piezo's. Always wondered about a casing and here it is ! lol. Could do with finding that board though. Enjoyed that, completely practical and useful as always :)
@researchandbuild1751 6 жыл бұрын
By the way if you put a choke across Diode input to ground , something like 25mH, it will also greatly increase the performance of the crystal set. It gives a DC return path for the diode while blocking the RF frequencies and forcing them to go through the diode. So what I mean is you put a choke just before the diode, across to ground, a nice high value one that has a high impedance at AM frequencies. 25mH should do fine. To the RF it looks like a giant resistor so it doesn't load things down. But for the diode it's like a DC path to "complete the circuit" that doesn't have to go through the earphone - you will get much better signal with less distortion
@RimstarOrg 11 жыл бұрын
Yup, I showed it in my "Crystal Radio Troubleshooting and Tips" video. Of course the other issue is, is the ground hole in the wall socket connected to ground? It is in only one socket in my whole apartment. To check, I use my voltmeter on the AC scale to test voltage between neutral (the taller of the two) and ground holes. In North America there should be close to 0 volts between them.
@SleepyMars-fz9bu 22 күн бұрын
Thanks! I have made a crystal earphone with the buzzer of a multimeter
@RimstarOrg 11 жыл бұрын
Glad you like it.
@RimstarOrg 11 жыл бұрын
My pleasure.
@RimstarOrg 11 жыл бұрын
Cool! Have fun making it and let us know how it goes. And if your Ma is talking only about the capacitor then I guess she just volunteered to make that part of it! :)
@vivetu 2 ай бұрын
Great idea!!! Thanks from Spain.
@CaptWindShear 10 жыл бұрын
Thanks man! I am restarting a hobby of crystal radios after nearly 40 years to find almost everything involved is scarce, now. The video is pure gold and like made for my case; I have a junked microwave in the basement. I was wondering if those tiny diodes on the PCB might be useful, too, even if a bias current might be needed, and there is a useful looking transformer there. Have not had the time to look at all your videos, but nice channel. Subscribed!
@RimstarOrg 10 жыл бұрын
Welcome to my channel! I'm glad you're finding it useful. Sounds like you're going to have some fun, biasing a diode in a radio is something I haven't done yet. In case you haven't seen it, and in case it helps, there's a Crystal Radio playlist on my main channel page that has all the related videos. Thanks for watching!
@PSKResearch 2 жыл бұрын
Try using those small cheap piezoelectric tweeters. Although they're used with 8 ohm speakers, their impedance is actually in the kilo-ohms (and highest below 15khz).... they're just really efficient.
@RimstarOrg 11 жыл бұрын
A timer that you spin/dial. That does sound like an old design. As you say, it's probably a mechanical bell. There's no harm in opening it up and checking for the fun of it. Just be careful not to touch the high voltage capacitor. I'd say the capacitor is usually in the bottom, rear on the side with the electronics but with your microwave oven it may not be.
@RimstarOrg 11 жыл бұрын
I tried that. The crystal radio didn't put out enough power to make it work. I did get that to work with a clock radio though, but that has an amplifier. If you're curious, see my video "How to Make Piezoelectric Crystal Speaker" (you can find it on my channel page.)
@jolovesvlad 11 жыл бұрын
Thanks for these great videos! I was looking for a cheap source of piezo speakers and found the easiest for me was to buy a window alarm from Dollar Tree. This works great because it also provides the housing.
@RimstarOrg 11 жыл бұрын
Thanks! Glad you liked it.
@OFP857BR549 11 жыл бұрын
Nifty! Me and pa are gonna make a similar radio like you showed. My ma ain't listnin to me 'bout how to make it. She just talks about the capacitor! Still, thanks for the step by step jazz. It was real helpful!
@RimstarOrg 11 жыл бұрын
Thanks Grant. Drain pipe? I'll have to try that. A longer antenna should help. I use three 15' wires in parallel and have tried one 50' length but I guess they were equivalent since there was no improvement.
@RimstarOrg 11 жыл бұрын
That would have been cheating. It's not homemade. But you're right, it didn't even cross my mind. I have that big a mental separation between homemade things and commercially manufactured things.
@RimstarOrg 11 жыл бұрын
Oh cool. Just had a look at their website... things that make all sorts of sounds.
@MrUbiquitousTech 7 жыл бұрын
Nicely done, thanks for sharing!
@RimstarOrg 11 жыл бұрын
Yeah, it's pretty time consuming to do subtitles so only a few of my videos have them so far. Meanwhile, the automatically generated ones are good if you ever need a laugh. :)
@f.kharrasi4333 8 жыл бұрын
Hello and thanks for your very informative video, the phone can be used capsules? Amir from Ahwaz, Iran
@RimstarOrg 11 жыл бұрын
You're welcome. Thanks for letting me know.
@makerj101 11 жыл бұрын
Very ingenues! You can power a LED with most piezoelectric crystals. The bigger the better.
@barrykelly2722 5 жыл бұрын
I wanna know how. Please tell me...please.
@MarcusTheHeard19 11 жыл бұрын
Interesting solution ill have to try it. Glad I met you while we were shooting that movie
@mimoslavija 4 жыл бұрын
Omg thanks i always put that in trashcan because I don't know what was that, but is very useful thing!
@mnpd3 8 жыл бұрын
I've used piezoelectric elements too for crystal radio work, but I always have to wire a resistor of 10k-12k across the piezo leads to get any volume. Dunno, maybe the radio or the piezo has a resistance built in. It's a good cheap way you describe, but in case you don't have an old microwave sitting in the corner, an even louder piezo is the Mallory FT-417 --- a very large device. You can use a single one with the resistor wired across the red and black leads. Or, for true headphones use two elements ---- simply tie the red wire of one piezo to the black wire of the other. You are left then with one red and one black lead. Wire the above mentioned resistor across the remaining leads, then apply the crystal radio's audio to the red lead with the black one going to ground. I've found these elements rival the old military sound-powered elements even when they are well adjusted. Many hobbyists mount the elements inside a pair of soundproof earmuffs after removing the foam.
@RimstarOrg 8 жыл бұрын
+mnpd3 My understanding is that at least one reason a resistor across the piezo leads helps is if your diode doesn't have enough leakage for each reverse cycle. It hasn't made a noticeable difference for me in the past, probably because my diodes have enough leakage. A google search for Mallory FT-417 and variations didn't turn up anything relevant. Is that a speaker or just the piezo crystal? I've always wanted to try making headphones. Just a question of too much on the todo list. :)
@RimstarOrg 8 жыл бұрын
+mnpd3 Nevermind re the Mallory FT-417. I saw your other comment about it below.
@youssefmoawfy9545 5 ай бұрын
What about a piezoelectric disk or piezo buzzer? I was working on a wireless telegraph project for physics class and then I realized that we can transmit sound just by changing the resistance/voltage. I've tried making a microphone by changing the length of the circuit using the force of a sound wave (like a phonograph) but it only makes noise. I gusse it can work as a speaker as well
@RimstarOrg 5 ай бұрын
Yes, a piezoelectric disk will for it too. That's what's inside this one from the microwave oven and that's what's in the regular piezo earpieces. As for a piezo buzzer, it depends on if there's any other circuitry in the buzzer that might interfere. I've used one as a speaker in this other video kzfaq.info/get/bejne/mJqmpZSSqpbeqqs.html
@ernie4886 6 жыл бұрын
Warning. Discharge big capacitor with a high insulation screwdriver before touching inside the electronic side of a microwave owen. Even if the plug is not conected to the wall. Voltages about 3000 volts can be present before discharging.
@RimstarOrg 6 жыл бұрын
Definitely. Thanks.
@RimstarOrg 9 жыл бұрын
+Dev TheHam What does your plain old piezo element look like? Can you be more specific? PS There's no Reply button under your comment because of your Google+ settings. - go to your Google+ page, - in the top, right corner click on your thumbnail icon, - in the popup that appears, click on "Settings". - for the 2nd question down "Who can comment on your public posts?" set it to "Anyone".
@RimstarOrg 11 жыл бұрын
I don't know the substance. It looks like the same type of material as in piezo disks you find in commercially available crystal earpieces, gift card speakers and piezo buzzers, in case that helps you find out. The use in a microwave oven is for the speaker that beeps when something is cooked.
@walgato1956 Жыл бұрын
Excellent!!! Good job. Thanks.
@marieomagpie 11 жыл бұрын
really I thought you had two. what where you using to listen to your crystal radio earlier? I think it is very much the same thing.
@devtheham9175 9 жыл бұрын
Would a plain old piezo element work for it? Have a couple lying around from a previous project
@Maccreeperslayer 9 жыл бұрын
I believe you can find these types of speakers on old motherboards sometimes
@RimstarOrg 11 жыл бұрын
What are "imtes"? I assume a typo but for 0.12$, I'd really like to know. That's a lot cheaper than a regular crystal earpiece.
@Oinikis 11 жыл бұрын
ye, i saw that. do you know what substance is used in these things, and why does the microwave needs a piezoelectric crystal?
@avimarc 9 жыл бұрын
Could you recommend a piezoelectric speaker to purchase for this project? (or at least recommended technical data like operating voltage)
@RimstarOrg 11 жыл бұрын
Thanks.
@letsfightdeepstate4880 2 жыл бұрын
Very nice. I was thinking about buying very cheap 100 piezo elements from aliexpress. But i just wonder how much impact does the impedance have? though they moastly are arround 300 ohm on this elements, and a crystal earpiece use to have 20k impedance. Any idea about that?. Would be very easy to make perfect earpieces with a 3d printer and blender i think.
@RimstarOrg 2 жыл бұрын
With a normal crystal radio, you need high impedance, as you say 20k. For low impedance you can add a transformer. For example, normal earbuds are low impedance, tens of ohms, but with a transformer, they work, though there are more losses. I did that here in this video kzfaq.info/get/bejne/famYZa-HrbvFpoU.html . And great idea about using a 3D printer to make the case! I didn't have a 3D printer back then but that should work well.
@letsfightdeepstate4880 2 жыл бұрын
@@RimstarOrg Thanks for response. Yes i tried to find these elements with higher impedance, but no luck so far. But same time in this video it seems like it works well to use this traditional piezo elements for a crystal receiver. Very nice idea to use a transformer then to get higher impedance. Will make some experiments with this and buy the one labeled 300 ohms impedance to check it. I can not use a crystal receiver here in Sweden then, though to far from a transmitter, but i have small low voltage receivers i have made that needs these crystal earpieces to. Yeah same with me, i had my first printer 2 weeks ago.
@letsfightdeepstate4880 2 жыл бұрын
@@RimstarOrg tried post a link to a 3d model for earpiece i made, but it was deleted. No idea why?
@RimstarOrg 2 жыл бұрын
I guess youtube's algorithm wrongly decided it was spam. I don't see it in my list of comments for review so the algorithm must have rejected it completely.
@letsfightdeepstate4880 2 жыл бұрын
@@RimstarOrg yeah i guess so to.
@RealationGames 11 жыл бұрын
Back in the days people did this a lot, but nowadays most hobbyists, including me, just order ready imtes on Ebay for 0.12$ or something. I liked it this old way though, of harvesting electronics. I'd figure it would be piece of cake to use some opamps to amplify it to speaker level...
@bassamali7738 4 жыл бұрын
Thanks alot, your explanation is very clear.
@hili467 9 жыл бұрын
I don't understand what I'm looking at when you show the crystal side. is there a wire soldered directly onto the face of the crystal and the other one soldered closer to the side?
@RimstarOrg 9 жыл бұрын
hi li The whole thing is what looks like a brass disk onto which is coated the whitish crystal. One wire is soldered to the brass disk (the connection that's closer to the side), so it electrically makes contact with the side of the whitish crystal that we can't see. The other wire is somehow soldered to the side of the whitish crystal that we can see but I don't know how that's done. I just looked at another one I have and it does appear to be soldered directly to the crystal, though maybe it's soldered through it (?).In commercially made crystal earpieces the brass disk is instead a flexible foil material that's held under tension by the earpiece's plastic case. I think that's what makes them far more sensitive and produce a louder sound.
@hili467 9 жыл бұрын
fascinating. Thank you for your excellent reply.
@fidelcatsro6948 4 жыл бұрын
This helped me in 2020!!!
@RimstarOrg 11 жыл бұрын
It's surprising they don't make the fuse more easily accessible and put in microwave oven manuals that it should be checked the the microwave stops working.
@HarleyFXS 7 жыл бұрын
Back in the 1960's, those were only around $1.00 and now I see they are $6-$12 on eBay
@tu-95turbopropstrategicbom55 6 жыл бұрын
Paul Crissman One dollar in 1960 would be $8.42 today. Also supply and demand, with transistor radios just emerging, the the supply kept up with the demand. Now with decreased production they have become commodities since less people value them and vice versa.
@ysvsny7 Жыл бұрын
great video!thank you!
@soonersciencenerd383 8 жыл бұрын
i almost forgot- i wound the tiny wire from a twist-tie, onto a large, leather needle, connected that coil to my crystal radio setup, and got FM stations! 1-2, but, FM radio!try it!
@donniewatson9120 4 ай бұрын
I found out that one can use a flame as the detector for a crystal radio.
@soonersciencenerd383 8 жыл бұрын
the plastic ink pen tube can be used for a coil form for a crystal radio. ive used a small, ink pen tube(that holds the ink), cleaned it, made holes, and wound 90-100 turns of wire, and I can get SW signals.another ink pen tube (like yours), I did the same, and can get AM signals, sometimes SW (on a clear nite).good video! I have several piezo speakers, and will try them!
@mnpd3 8 жыл бұрын
+Sooner Science Nerd I've always found that the larger the coil form; the more sensitivity and selectivity is had. Smaller coils work, but tend to be excessively long and if tuned with a strap slide a very long range of movement is necessary. It's why most small coils use a powdered iron/ferrite core which may or may not be adjustable for tuning depending on the range of the variable capacitor --- if one is even used. The coil itself can handle the tuning job if made adjustable, even if selectivity and sensitivity is reduced.
@soonersciencenerd383 8 жыл бұрын
+mnpd3 I get the best reception from a small pill bottle with 100 turns on it. I can get 2 local stations, CBSsports,ESPNRadio, and WorldHarvestRadio. not bad at all.I connected a piezo speaker to my amp, and it acted like a microphone!I got the piezo speaker from a scrapped boom box. (from my radio and tv scrapping, I have 50+ speakers, all sizes, and they work fine!)
@RimstarOrg 11 жыл бұрын
Now that you mention it, I never checked. I just grabbed it from someone's trash one day. Been scavenging it ever since.
@VictorVii 11 жыл бұрын
Good video as always.
@okhamradio 4 жыл бұрын
Thanks for sharing!👍
@thomasjensen7301 2 жыл бұрын
Thank you comrade
@Unbekannter_Mann Жыл бұрын
I got a question can any piezoelectric works
@RimstarOrg Жыл бұрын
I suspect not. There isn't a lot of power coming from the crystal radio and so it has to be one that can give good vibrations for the sound waves while still being given lower power.
@lucaswootten3064 9 жыл бұрын
I was just curious. Whenever the current enters the diode, it looses voltage and the negative portion of the wave is stripped off. Then it goes back into the earpiece. What makes the crystal sense it then? What exactly does the diode cut off? Does it make the audio wave more positive by cutting off electrons so the earpiece only pickups the protons?
@RimstarOrg 9 жыл бұрын
Lucas Wootten Rather than type out a long answer, I'll refer you to my video on how a crystal radio works kzfaq.info/get/bejne/ZpOAg8SjuNPbpHk.html. 2:02 has stuff about the diode and crystal. 8:55 starts talking about the radio and audio waves.
@lucaswootten3064 9 жыл бұрын
I understand the majority of it, I actually did a presentation on it. But my professor wants every possible detail. But mostly how exactly the piezoelectric crystal picks up the waves after it exits the diode?
@RimstarOrg 9 жыл бұрын
Lucas Wootten Hmm... I don't know what more I could say besides what I explain starting around 2:02 into the video. Did you watch all of the video? There's even more about the waves starting at 6:54 that then leads into the stuff I pointed out at 8:55.
@renekenshin6573 10 жыл бұрын
Here's a tip, you can also use the mic from a telephone handset. The part that you use when speaking. Its also a piezo speaker
@RimstarOrg 10 жыл бұрын
Thanks for the tip. I've been hoping to run across an old discarded telephone handset but so far no luck. Maybe I'll find one at the yard sales in the summer.
@RimstarOrg 10 жыл бұрын
***** The small size of the speaker actually works against it by having a very low impedance (resistance to AC). Piezo crystal speakers like in the microwave oven actually have a high impedance. However, you can try adding a transformer in between the crystal radio and the small speaker. I show how in my "Use Earbuds/Earphones with Crystal Radio" video kzfaq.info/get/bejne/famYZa-HrbvFpoU.html
@gameyord7182 Жыл бұрын
I would use a rc choke before the diode
@Oinikis 11 жыл бұрын
oh, i got a microwave and it dings (ding is produced by bell or something) when it's cooked, also, it has no buttons, you have to spin the timer. soo my microwave is probably old designed.
@luisadrianomeusparabens6863 4 жыл бұрын
Muito top parabéns
@janetwinslow2039 8 жыл бұрын
Nice use of a piezto sounder. Given me some good ideas. (Interesting automatic voice-to-text subtitles! Can they be turned off?)
@RimstarOrg 8 жыл бұрын
+Janet Winslow Cool. Glad I could stimulate some ideas. Re the subtitles, click on the CC button at the bottom of the video to turn them on or off. Hmmm... it's indicating that I've add captions but I never did for that particular video. Normally if there are only the automatic ones then it doesn't indicate beside the video name that there some (EDIT: I just now removed the captions that it thought I'd added, but didn't. Thanks!)
@janetwinslow2039 8 жыл бұрын
OK, thanks for the info. I didn't think you added them on purpose. They were obviously automatically generated and worse than useless!
@RimstarOrg 8 жыл бұрын
+Janet Winslow They were both obviously automatically generated, but there was a glitch since there should have been only one automatically generated one. When I 1st read your comment, I went and looked and there was a second one which shouldn't have been there and it was telling me that I'd added it, when I hadn't. So thanks for bringing it up even though it looked automatically generated.
@cooper22592 9 жыл бұрын
Is this a piezo buzzer or piezo transducer? I'm trying to get one from radio shack. Thanks
@RimstarOrg 9 жыл бұрын
Cameron Cooper The answer is yes, it's both. A transducer is something that converts energy from one form to another. So a piezo crystal acts as a transducer when converting mechanical energy into electrical energy and when converting electrical energy into mechanical energy. A piezo buzzer does the latter, converting electrical energy into mechanical energy which produces sound waves in the air. But the one in this video isn't quite the same as the piezo buzzer you get from radio shack. The one from radio shack is like this but with the addition of some extra circuitry for converting DC electricity into something that pulses the piezo crystal.
@cooper22592 9 жыл бұрын
Ok thank you! Also I'm not sure what my inductance should be for my coil. I'm using a short piece of bamboo with a diameter of 2.75. The wire I decided to use Is thermostat wire which I believe is 18 gauge. Now rather than wrapping it and then sanding the insulation off I made 7 individual taps by raising that piece of wire and stripping the insulation and twisting it that way my alligator clip can clip onto that wire.. What is your opinion on my construction/calculations... My calculated inductance is 148.5uH
@RimstarOrg 9 жыл бұрын
Cameron Cooper I'm assuming that's 2.75 centimeters. 2.75 inches would be a pretty thick piece of bamboo. To calculate inductance I'd also need to know how many turns you have on your coil and how long the coil is. My coil tops out at 369uH.
@cooper22592 9 жыл бұрын
RimstarOrg Yes it is 2.75 inches in diameter. Length of coil in inches is 3.5 and number of turns is 61 with a tap every 7 turns giving me 7 taps total.
@RimstarOrg 9 жыл бұрын
Cameron Cooper Cameron Cooper At full length I calculate an inductance of 789uH. If your variable capacitor is the same as mine with a top capacitance of around 600pF then you should be able to tune up to 1.7MHz, so that includes the full range a normal AM radio can tune into. That's using only the formula for parallel coil and capacitor resonance (LC tank circuit.) The inductance formula I'm using isL = (permeability x number of turns x number of turns x area) / lengthwhere the permeability of air or bamboo is around 1. This is using the metric system, so the dimensions use meters.
@najroe Ай бұрын
easy fir most to achive I thought I would see a rochelke salt crystal grown, crystal then sandwiched between two pieces of silver foil with wires atached, now difficult part, which way does it deflect most? largest deflection direction is determined by some neans. now crystal is connected to a beam armature so max deflection is achieved, end of beam then linked to a transducer membrane (usually aluminium foil). then something like the enclosure you made is fitted. This us nice though, relatively easy to do with care it can be dobe without a soldering iron by cutting away the circuitboard around the solder holding the transducer carefully
@RimstarOrg Ай бұрын
I use my rochelle salt crystal in this video kzfaq.info/get/bejne/ZpOAg8SjuNPbpHk.html , mostly as a speaker though I create a small earpiece sized one at around seven minutes and twenty seconds into the video. I tested the polarity of that crystal in this other video kzfaq.info/get/bejne/iJ-dapygvMqzin0.html
@najroe Ай бұрын
@@RimstarOrg great, yes I know I was picking as bit, not meant any harm, just information
@RimstarOrg Ай бұрын
No worries. The more sharing, the better. Thanks!
@RimstarOrg 11 жыл бұрын
Ha Ha! I'm not surprised your mom won't let you do that! :) Often people throw them out and I take them when I see them. You can also use piezo buzzers available at electronics stores. You can buy crystal earpieces online (I put some links in the description below this video.) You can use earbuds, like iPod earbuds for example, by adding a transformer. It's harder to do. You can see how in my "Use Earbuds/Earphones with Crystal Radio" which you can find on my channel page.
@punsher6411 3 жыл бұрын
can i use the the buzzer for crystal earpiece
@RimstarOrg 3 жыл бұрын
Sorry for the delayed response. Yes, you can use a buzzer. I demonstrate it in my Crystal Radio Troubleshooting and Tips video here kzfaq.info/get/bejne/fsCKoK6Lr9ith2Q.html at around one minute and thirty seconds in.
@CAPTAINSSBN 9 жыл бұрын
try putting the sound hole against a sea shell for amplification like a Bodes System
@RimstarOrg 9 жыл бұрын
***** I think you meant bose, the speaker makers?
@cheesebuds8962 7 жыл бұрын
That's wonderful!
@CAPTAINSSBN 9 жыл бұрын
If you leave it on what happens to the output? does it get more intense with time?
@RimstarOrg 9 жыл бұрын
***** No, the output stays the same.
@mnpd3 8 жыл бұрын
+RimstarOrg Yep, output is constant depending on station strength. One tip though --- if any crystal element stops working altogether, try a moderate tap or drop against a hard surface to get it going again. Sometimes these crystals will develop a charged polarity and have to be moved to discharge it (my theory anyway ---- in any case the thump or drop works).
@bacahturzh4551 4 жыл бұрын
Can i use the ringer of a oven toaster
@RimstarOrg 4 жыл бұрын
I haven't opened on up for I can't say for sure. The ones I've heard were all quick "ding!" sounds which I suspect is a bell mechanism of some sort and not a piezoelectric component.
@ver64 11 жыл бұрын
Awesome idea.......thanks
@marieomagpie 11 жыл бұрын
I can't believe you didn't go an extra step and show them how to power two earphones with just another diode. they work on negative voltage too.
@justrosy2635 6 жыл бұрын
Are there any safety issues involved in opening up an old microwave to strip for parts?
@RimstarOrg 6 жыл бұрын
Yes. There's a high voltage capacitor that should be discharged immediately after you open it. It's usually located near the back in the bottom.
@justrosy2635 6 жыл бұрын
Like this one? sep.yimg.com/ay/yhst-82574741899364/microwave-high-voltage-capacitor-2100-vac-85-mfd-uf-13qbp21085-4.jpg
@RimstarOrg 6 жыл бұрын
Yup, that's the one.
@RimstarOrg 6 жыл бұрын
My needle nose pliers have thickly insulated handles so I usually stick one end on each capacitor terminal.
@PaulusdeKenezy 8 жыл бұрын
What about the high voltage danger?
@RimstarOrg 8 жыл бұрын
Do you mean the high voltage danger due to the capacitor? I guess I can add an annotation or something to the video description. Good point. There is a bleed resistor and I've never found one to be charged when I've opened them but I know that because I always to try to discharged it anyway.
@GaryLeventhal 11 жыл бұрын
I found out some back most Microwaves thrown out just have a bad fuse.
@jomona9783 6 жыл бұрын
Sir. How to make a crystal radio earphone without a piezoelectric buzzer. Using magnets and copper wire
@RimstarOrg 6 жыл бұрын
I've always wanted to make one of those but I haven't yet. I don't know if I'll ever get time to.
@pornhub1 4 жыл бұрын
how well does it work compared to the real thing
@RimstarOrg 4 жыл бұрын
It's not quite as loud but it's close.
@pornhub1 4 жыл бұрын
oh thanks
@pornhub1 4 жыл бұрын
@@RimstarOrgthis is why i subscribed 2020 and still replying to comments, legend
@jozefnovak7750 2 ай бұрын
Super!
@dorian8475 9 жыл бұрын
Hi! Can you show me how to do galena detector?
@mnpd3 8 жыл бұрын
+Dorian Bondoc First, all galena is not equal. Some of the stuff is outstanding as a detector while some of it will barely detect anything. You'll need to either buy one that is tested and working, or get a lot of galena and break it up looking for the good pieces. All you'll need to do is make a "cat whisker" on a rocker arm of some sort. Use the thinnest gauge phospher/bronze wire you can find, and "tickle" the galena crystal with the lightest pressure possible. Keep tickling until you find a loud setting. NOTE: Heavy pressure - or pressure of any amount at the wire/galena contact means you won't hear anything. In a pinch I have used an open safety pin with the phospher/bronze wire gently touching the galena.
@robertnagy2491 Жыл бұрын
Not use paralel resistor?
@RimstarOrg Жыл бұрын
I didn't but you certainly can. It sometimes helps.
@kilbonrobert 11 жыл бұрын
Great work :)
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