I was given an old AV AMP for free. Are there any useful components to SALVAGE?

Рет қаралды 8,574

5 ай бұрын

A great way to build up a useful collection of Electronic Components for free is to salvage them from scrap electronics. Here is an old AV Tuner Amplifier, it's worthless as it does not have HDMI but is it worth something for the parts in contains?
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Пікірлер: 79

@Edmorbus 5 ай бұрын

A video on testing current ratings of transformers would be interesting.

@user-ws7ov3yy4i 5 ай бұрын

Woohoo top 200 viewers. Richard! you have become my hero in the last six months and have inspired me while im in the shop youre always playing in the background. . i have taken up repairing anything. From electronics to home appliances and pcbs. its a battle everyday and sometimes quite frustrating. The local i live in has no-one that performs this sort of service, so heres my chance to be unique and in demand. its going to be a tough startup getting a business off of the ground, til i have the experience and knowledge, but with everyday of work and every episode of your show i get better at it, smarter, and faster. thank you for this show you are one of a kind and my celebrity hero. Yours truly, Dentronics😎😎

@andymouse 5 ай бұрын

Congrats and good luck ! you might wanna change your name there it sounds like a designation you get from the government LOL !

@PoppinWheeliez 5 ай бұрын

People buy those all the time to use as stereo amplifiers. The ones from the 90s with analog tone controls sell over 100 CAD in under a week. Even more if ot has a phono input. The small transformer is there just to keep the amplifier in standby mode.

@robbietee4785 5 ай бұрын

A video on testing current ratings of transformers would be interesting. Also maybe an Arduino type project with tuner chips would be a good future video for The Electronics Channel? Or a project for Detlef?

@Shmbler 5 ай бұрын

They're not worthless to me. I'm running a much cheaper 25 year old JVC AV receiver daily to get some quality digital audio from my PC. There's nothing better than a big ass home theatre subwoofer under the desk. I won't ever listen to music or play games again without it.

@LearnElectronicsRepair 5 ай бұрын

I agree - but everyone wants HD and UHD these days so these older AV amps without HDMI are pretty much worthless, plus I didn't have the speakers or remote and no idea if it actually worked anyway. Yeah I can see a good use as PC speakers

@milesjcarter 5 ай бұрын

@@LearnElectronicsRepair Higher end ones with discrete transistor amps rather than the STK chips can still be worth a bit - if they have a reputation/capability as also being decent stereo amps for music, or have direct analog inputs for each channel (so the amp can effectively be a 5/7 channel power amplifier). If you have some know how with audio configuration and a PC it's possible to use multiple of these amps to run modern immersive audio setups (e.g. Atmos), I currently have two higher-end non-HDMI 7.1 amps (a Marantz and an Onkyo) running a 7.2.2 setup (with the main stereo channel bi-amped) and it cost me barely anything vs a 'decent' wireless soundbar setup. This is also totally modular and expandable like I could easily add another sub channel and swap components out.

@jonathanrose456 5 ай бұрын

As for value… they’re only worth what someone is willing to pay for them & as an amplifier, you’d be lucky to get your postage costs back on eBay.

@bobpitt1261 5 ай бұрын

Those capacitors are "safety caps" designed to fail open and not short. Those marked with an "X" go across the AC source (typically the mains) and those marked "Y" go in series with the AC source.

@SlyerFox666 5 ай бұрын

X/Y snubber capacitors - There's lots of confusion about this. X capacitors are safety-agency approved to go from Line to Line or Line to Neutral and can fail short or open because a fuse is presumed to be present. There is no restriction on the value and you can, indeed, buy X-rated capacitors with absurdly large values of 10uF. In fact, in industrial equipment this value is not uncommon given the extreme levels of noise present. Y-capacitors go between either Line or Neutral and Earth Ground so they are considered much more dangerous from a safety standpoint and are therefore highly restricted in value (based on the amount of current they shunt into Earth Ground) and they must always fail open. Y-capacitors can be used in both locations - that is, X or Y - but the range of values vs. RMS voltage rating is much more limited. The capacitor often seen bridging input and output common on a transformer must also be Y-rated, as it's failure would defeat the isolation provided by the transformer.

@andymouse 5 ай бұрын

They look like 'Baby Rifas' to me.

@SlyerFox666 5 ай бұрын

@@andymouse Not cracked enough to be a Rifa haha

@andymouse 5 ай бұрын

LOL !! :)@@SlyerFox666

@BTW... 5 ай бұрын

There was more than X1 Y2 caps shown in the video.

@camelid 5 ай бұрын

The ceramic filter is a 10.7mhz passband filter for the FM receiver. 10.7 seems to be the standard for IF frequency for most all superhet FM receivers.

@greengrayradio1394 4 ай бұрын

MHz. Not "millihertz"..

@TheCatherineCC 5 ай бұрын

Even if you're not going to use the components, stripping a board all the way down is great for building soldering / desoldering skills.

@78vinyl97 5 ай бұрын

Good bit of advice.That's exactly what I did when first started out.

@NEW_INSITE 5 ай бұрын

That red filter covered display module, is a vacuum fluorescent display. I salvaged a lot of them. I have read many articles on people using them as a kind of weak vacuum tube. They have used them with Crystal Radio sets and actually Amplified the volume up to be able to get sound to come out of a small speaker. A bit of fun Maybe

@andymouse 5 ай бұрын

Always fancied a go at that too :)

@NEW_INSITE 5 ай бұрын

@@andymouse yeah the interesting thing about using those vfds as a tube for a low-powered tube amp circuit, is that as the signal goes up and down, the vfd actually lights up and down a little bit. A real interesting visual effect added to your project. Lol.

@andymouse 5 ай бұрын

:)@@NEW_INSITE

@Enigma758 5 ай бұрын

I salvage them to, but I use them as displays.

@NEW_INSITE 5 ай бұрын

@@Enigma758 do you use them in repair work to replace worn out or malfunctioning vacuum fluorescent displays, or do you use them to create some kind of artwork type of display

@robertmckelvey3091 3 ай бұрын

I love those style of stereo I buy them every time I find one in the cabinet makes a great power supply

@ser_olmy 5 ай бұрын

If the composite video outputs are switched with relays, it's a fairly trivial matter to modify an external HDMI switch so it switches according to the selected composite output. Since most if not all devices have RCA outputs in addition to HDMI, you can use them for the audio and hey presto, you've got an old A/V receiver with HDMI capabilities.

@andymouse 5 ай бұрын

I love a bit of harvesting ! I think the 'Arduino Radio' is a cracking idea, I think it will tick a lot of boxes there for recycling and it sounds interesting to take a scrap chip and build something useful....cheers.

@alanrichardson1672 5 ай бұрын

It would be useful if the VA rating of the transformers was known!

@jeremiahchamberlin4499 5 ай бұрын

I have this same Receiver, worked when I took it out of service except for Left and Right Surround speaker outputs. I would be interested in learning how to check the power rating. Seems odd that it wasn’t labeled with it; most transformers I’ve handled in industry will state the power rating before suggesting appropriate voltages at the terminals, and they seldom offer current ratings, as the current on the primary and secondary will vary with the turns ratio. So the only real thing you need to know about a transformers is the power rating; the turns ratio you can work out for yourself. If either the primary or the secondary of the transformer is fused (with amperage noted), then you can easily work out the power rating. Again, it seems odd the power rating isn’t given, and would be very good to know if one intends to use it again for a future project.

@Amplified208 5 ай бұрын

The power consumption says 240 watts .which is the same as 240va . Divide by 5 chan les . Probably rated about 50 to 60 watts x 5. No power house by any means but amazing sounding receiver.

@robinedminson6461 5 ай бұрын

Polystyrene capacitors are world renown for their incredibly stability and fabulous tone. A low cost capacitor that offers a broad range of values starting from 10pF up to 10000pF, great for audio circuits

@NEW_INSITE 5 ай бұрын

Some people like to use them on their electric guitar tone control circuitry. They also like to use the old bumblebee type capacitors that you get out of old tube equipment. It gives a certain tones you just can't get from regular electrolytic

@budgetmerch 5 ай бұрын

Lots of useful stuff in there. I was hoping to see a toroidal transformer but nonetheless, good stuff. Those polyester caps are very stable so good save there.

@Blinkerd00d 5 ай бұрын

I love those nichicon polyester caps.... really good for circuits with a high switching frequency.

@Mark_C1 5 ай бұрын

@@Blinkerd00dwere they the yellow foil type caps he had loads of ?

@Blinkerd00d 5 ай бұрын

@@Mark_C1 yeah, they are sometimes called mylar capacitors or PET film/foil capacitors.

@Mark_C1 5 ай бұрын

@@Blinkerd00d nice one, thanks for that !! Has been years since I last saw those, iirc I usually found them in small radios and r/c cars many moons ago.

@Blinkerd00d 5 ай бұрын

@@Mark_C1 I use them in guitar pedals- I have tons of them.

@jimjones1652 5 ай бұрын

With higher postal charges and minimum orders I try and save as much as I can. I'm not reselling stuf it's just a hobby for me. I get most of my stuff from skips and it amazing what people throw away and most of it working or minor faults.

@andymouse 5 ай бұрын

Me too! I have always enjoyed skips from an early age. You said 'Skip' so I'm betting your a brit ! :)

@Foxyfoxy9293 4 ай бұрын

I still use my 2006 Yamaha RX-V457 and will never trade it nor take it apart for parts, sound quality, DSP and wonderful amber display 😍. They don't make them as pretty as before. After film capacitor replacement in power section it's back and ready for more.

@Dutch_off_grid_homesteading 5 ай бұрын

Heya, nice that you got this av amp for free and see if there are some componments that you can solve and maybe use in projects or repair and you don't have to bay them and they will not and up in the garbish.

@retrocomputinggrotto 4 ай бұрын

You can never have enough salviged spare parts! I've got shelves full of all sorts of things 😎

@cecildramat-ps9eq 5 ай бұрын

Hi !Richard hope you doing well really love your channel an content why not try and make a series on building some cool projects with some of the salvage components especially now with your electronics tutorials you started a while back, all the way from, Cape Town, South Africa.

@hookydoo 4 ай бұрын

Those yellow caps are Nichicon film caps. Typically around 20-75 cents from Mouser.

@lakinnenlako6883 5 ай бұрын

I would rather try to repair it. In my highschool if I had receiver like that I would jump of joy. I was kind of a poor guy that always had cheap radiocassete players or cheap midi systems with the power output 2x2.5W RMS.

@jonathanrose456 5 ай бұрын

Back again! I’m gonna have to start charging you for all the hours (days) I’m losing watching your channel lol

@anonymoususer6448 5 ай бұрын

Beware of old Elco's When I was young, (that was in the 1980's) I had bought a small bag of Elco's for very cheap. I was frustrated that many of my projects didn't work. Many, years later, I had bought that marvelous little component tester and it turned out that all of the elcos had dried out and their capacity had dropped substantially. Since then, I test each and every Elco that I recover, especially if they come from fan-less equipment that tend to run hot. If a device reboots regularly without any reason, then Elco's are my first suspect. Just my 2 cents /chriV

@Amplified208 5 ай бұрын

I'm guessing that the transformer output current is under 3 amp per rail. And that was a nice av amplifier 😢😂

@LearnElectronicsRepair 5 ай бұрын

There are plenty more for free (or nearly) at the car boot sale

@RuneInternational 5 ай бұрын

The small transformer is the standby. That is why the big one is connected via the relay

@SlyerFox666 5 ай бұрын

Was working on one not long ago the big black devices on the heat sinks are audio amps for the Chan's a and b I think, I remember they were worth more than a second hand unit from the usual places online.

@jeroenjeroen 4 ай бұрын

Would like to see the current reading video!

@romancharak3675 4 ай бұрын

The rotary encoder only has 3 pins because there is no push-button switch function.

@kenjackson5938 4 ай бұрын

Thanks for another great video. I am New to the electronics experience. I’ve saved a bunch of old boards and thought I would try some of the desoldering you do. What a frustrating nightmare. I’m guessing you use a Much hotter iron than I have. I was amazed how quick you were able to melt the soldering and pull the pieces off. I was melting and using one of those manual solder suckers, worked…ok… I certainly was not able to melt the solder off 2 or 3 pins at a time like you did. I’m sure time for a new iron. Thinking of the Weller variable wattage ones. (Analogue vs digital because cost.) I saw you using a hot air gun. Would the hot air guns that are not specifically used for desoldering be acceptable?? I have a simple circuit tester and a soldering iron heat tester on order. I’m not looking into getting into the profession of electronics repair, but being able to work on small electronic projects whe I want, but also not “swearing” at under rated tools. Any help would be greatly appreciated. Cheers.

@user-om5jc1tq4i 3 ай бұрын

Nice one! Can you estimate the T current rating by gradually increasing the load while monitoring the temperature(s)?

@gendragongfly 5 ай бұрын

Technically the rule that the winding with the highest resistance is the AC input is only valid on low voltage transformers. A high voltage transformer will of course have a high resistance on the output as well, probably higher than on the input side. And for the power/current rating of the transformer the thickness of the wires on the output side are only an indication, you need to look at the thickness of the wires used for the actual winding to get a better idea of the actual current rating. Lastly ofcourse you should load test the transformer and see how much the windings heat up, that will allow you to determine an actual 'save' current and power rating. The enameled wire is usually okay to at least 85°C but the transformer itself shouldn't heat up above 60~65°C as this reduces the power conversion efficiency and it's a safety hazard.

@mikepanchaud1 5 ай бұрын

It would be interesting to test those fusible resistors. I guess just pass a current that corresponds to double the power rating and see if it blows. Obviosly a destructive test but you have several there!

@allanyoung4510 4 ай бұрын

I’m my experience all components are fusible 😳🏴󠁧󠁢󠁳󠁣󠁴󠁿

@jonathanrose456 5 ай бұрын

Have you tried a mini hot plate to get the sockets off the board?

@anthonyshiels9273 4 ай бұрын

I would LOVE to know how to find the current rating of a transformer.

@brijeshjaiswalgoa 5 ай бұрын

I have recently received the same model, the issue reported was stand by mode, it used to go off in a few seconds.... Couldn't resolved😢😢😮

@BTW... 5 ай бұрын

It will be a Cap on the small "Main 2" board that usually presents as this type of fault, or a Cap associated with the 5V (control) power supply on Main Board.

@Piasecznik72 5 ай бұрын

Looks like resistors are just have paint to insulate them while they are soldered in standup orientation. But sure I can be wrong. It is particularly puzzling why always long leg is covered in paint.

@LearnElectronicsRepair 5 ай бұрын

Yeah I wonder that too

@BTW... 5 ай бұрын

Not for insulation. What will happen to the paint on a component that overheats?

@Piasecznik72 5 ай бұрын

@@BTW... Since legs have very low resistance, paint will not burn, especially in such small wattage resistors with smal leg thickness (low termal conductivity).

@BTW... 5 ай бұрын

@@Piasecznik72 There is more to the resistive COMPONENT than just the legs, made from plated copper that conduct heat very well. Have you never seen even small 1/8 or 1/4W resistors burn a PCB even when used in a vertical position, let alone larger 1/2 or 1W resistors in the power supply section? And any resistor will heat in an overcurrent situation. The paint will discolour when heated.

@Piasecznik72 5 ай бұрын

@@BTW... I never have seen 1/2W resistor mounted in standup orientation to burn anything at the end of long leg. Copper conduct heat very well but also dissipate it at same rate as well. Let's calculate how much heat goes further down the wire in relation to surrounding air. Assuming wire diameter is 0.5mm its crossection area would be 0.2mm2 But lateral surface area of that wire of 0.5mm length would be 0.78mm2 almost 4 times larger. Of course air thermal conductivity is far less than copper but we have convection as well to factor in.

@Hank254 5 ай бұрын

Do you use an inventory program to keep track of all the component you remove from scrap boards? Any one in particular you would recommend? Thanks for all the great videos, I have learned a lot from you and greatly appreciate your hard work.

@LearnElectronicsRepair 5 ай бұрын

I'll make a video showing how I organise components

@TheCatherineCC 5 ай бұрын

If you talk about how someone new can start organizing and slowly upgrade their storage solutions, that would be helpful. Lots of people are starting with a relatively small amount of components (and don't really know how to categorize, do you sort resistors by ohms or wattage or tolerance) and it doesn't really make sense for them to drop a quarter paycheck on a big storage container with many drawers. @@LearnElectronicsRepair