#1616

Рет қаралды 6,614

IMSAI Guy

10 ай бұрын

Episode 1616
LCR model of a crystal
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Пікірлер: 48

@Hellhound604 10 ай бұрын

Worked in the RF-industry for 40+ years, but every now and then I still learn new things, or get reminded of elementary things that I have forgotten. This video is one of those… thanks for triggering those old and diseased brain-cells of mine.👍👍👍👍

@DeezNutz-ce5se 10 ай бұрын

How do I get into a career like that?

@bayareapianist 10 ай бұрын

@@DeezNutz-ce5seyou have to be very passionate about learning this stuff and then get lucky and a manager recognize your passionate and hires you.

@DeezNutz-ce5se 10 ай бұрын

@@bayareapianist oh great. Not happening where I live. Geuss I'll have to move. Cheers

@richardgray8593 10 ай бұрын

I like how you pick a bite-sized subject and do a short instructional video on it. I've got zero experience with spectrum analysers, so it's nice to see one in action.

@IMSAIGuy 10 ай бұрын

I did a two part beginners guide to spectrum analyzer: kzfaq.info/get/bejne/kMtkiZmC1ZfRe2w.htmlsi=6iNQ7EtpfV7gCxZU

@richardgray8593 10 ай бұрын

@@IMSAIGuy Thank. I'll check it out.

@kennywang6222 3 ай бұрын

Awesome teaching material without scary mathematical formulas. Thank you.

@AnalogueGround 10 ай бұрын

Excellent video. In my 50+ years of electronics, I’ve never thought of the quartz crystal in any great detail.

@justinkovacik9436 10 ай бұрын

Thank you that was very educational. Feeds my hunger to know how things work

@egbertgroot2737 10 ай бұрын

Another mystery demistified in my life! Thx

@tonyfremont 10 ай бұрын

Lead inductance really matters. All passives are really just some combination of inductance, capacitance and resistance. ;-)

@georgesampson4714 10 ай бұрын

That was a pretty good one, video I mean. I read about this stuff but having the equipment to actually perform experiments makes it come alive.

@jagmarc 10 ай бұрын

I vaguely remember a tuneable crystal used at the AM detector , used as a sharp notch filter , on some government quality communication receivers from WW2 until a few decades ago

@hubercats 10 ай бұрын

Very nice presentation. Thank you!

@ats89117 10 ай бұрын

The name of the model is BVD or Butterworth Van Dyke. It would have been interesting to show the phase plot where it is common for the response to be inductive between the resonance and anti resonance frequencies while being almost purely capacitive away from the resonance and anti resonance peaks. PZT transducers have the same type of response. Being made of a ceramic mix, they are not nearly as consistent as quartz, but they have much greater sensitivity, so they quickly replaced quartz in early sonar transducers...

@__--JY-Moe--__ 10 ай бұрын

did I hear breakfast! world renouned Van Dyke Freench Toast! Mmm yummy!🐒

@dimBulb5 10 ай бұрын

Great job! Very helpful !

@andymouse 10 ай бұрын

Fascinating tutorial !...cheers.

@paullavender6227 10 ай бұрын

Great video, thank you. It left me wanting to grab my cheap little SA and have a play.

@raylowe3324 10 ай бұрын

Great video. Back in the early 1980's, I built an audio filter based on the electrical equivilent schematic of a crystal. It had a peak at 700 hzs and a notch at 1600 hzs. The notch was caused by the parallel equivalent circuit.

@bobdoritique7347 10 ай бұрын

Merci for this video. Very well explained.

@thomasmaughan4798 10 ай бұрын

I did this with a Keysight oscilloscope that has the tracking signal generator built in.

@jagmarc 10 ай бұрын

What's so clever about Xtals is how they assemble a group of different ones together and they make up a precision narrowband pass filter. Say at 9 MHz with 2.4 kHz width. And another grouping makes up a 9 MHz with 300 Hz bandwidth. Amazing, before digital radio

@tonyfremont 10 ай бұрын

I've done exactly as you describe. I built a 75m receiver on a big breadboard and used a crystal filter network to act as a narrow filter and using the same frequency crystal injected to do a direct conversion and detect the LSB. It was kinda haphazardly hokey, but it did work surprisingly well.

@jagmarc 10 ай бұрын

Surprisingly good result with just injecting into the last stage's non linearity , from crystal-based BFO with varicap clarifier. I guess that's how you did it or did you use a proper balanced demodulator?

@IMSAIGuy 10 ай бұрын

here is my video on xtal filter design: kzfaq.info/get/bejne/aduCdJShm7XTpHU.htmlsi=4-A0FAeEWyXVfOyN

@R50_J0 10 ай бұрын

Good.

@d942yd42 10 ай бұрын

Phase!

@t1d100 10 ай бұрын

At 9:30, you combine the series LC with the parallel LC. In doing so, you connected the parallel C in front of the series C. This places the influence of the series C in the parallel circuit. I would have expected the parallel C to be connected between the series C and the L. Why is your method correct and my method incorrect? Is it that the series C influences the parallel C regardless of the attachments point, because, when combined, they become just one circuit? Please and thank you. I am a self-taught hobbyist with significant knowledge gaps from only studying what interests me.

@IMSAIGuy 10 ай бұрын

rfic.eecs.berkeley.edu/~niknejad/ee242/pdf/eecs242_lect25_xtal.pdf

@willthecat3861 10 ай бұрын

Just for the record... the actual quartz crystal, inside the can, and mounted between two plates, is more analogous to a pane of glass. The quartz crystal is greater than 100 times thinner than it is wide, or long It could be 6 mm wide, and 10 millimeter long... and yet be only 10 micrometers thick... that's hardly block shaped, IMO.

@rfburns5601 10 ай бұрын

Focus?............Bofus? Hah! Always remember to adjust the output tank on your pierce oscillator above the series resonant point of the crystal, so that the output drops by about 10%. Else your oscillator will squegg out!

@jagmarc 10 ай бұрын

sound advice. to do with phase. I know someone with his transceiver, he'd tweaked up every screw for "maximum output". Started squegging or something when it got hot! Not sure exactly was 40 years ago

@thomasmaughan4798 10 ай бұрын

Yay, HP 35s calculator.

@magicsmokeblog 10 ай бұрын

I love that part too, somehow, i feel it would be perfect if he was using an HP 15C.

@IMSAIGuy 10 ай бұрын

I had the 11C 12C 15C and 16C.

@thomasmaughan4798 10 ай бұрын

@@IMSAIGuy I had every one except the fabulously expensive HP65, the one astronauts took into space. My favorite was HP-41c and I really don't remember why I got rid of it. Needed money I suppose. I bought the HP-71b it's a beauty but it doesn't do RPN, it is a little handheld computer. It doesn't get much use but it sits on my computer next to a TI that gets even less use.

@IMSAIGuy 10 ай бұрын

@@thomasmaughan4798 You can't name one I have not had. I had a massive collection once but sold it off.

@glenncummings1326 10 ай бұрын

@@magicsmokeblog HP is reintroducing one.

@mr1enrollment 10 ай бұрын

reactance

@byronwatkins2565 10 ай бұрын

Actually, the usage of "series resonance" and "parallel resonance" is pretty close. Below resonance a series combination has capacitive (leading) impedance and above resonance it has inductive (lagging) impedance; at resonance its impedance is minimum and in phase. Then, above the series resonance, the equivalent inductance can form another resonance with the parallel capacitance. This parallel combination has maximum, in-phase impedance at resonance. The ONLY trait that is different is that neither the series resonance nor the parallel resonance can be modeled in detail as a separate circuit with constant L and C.