39:08 The rectifier diodes are not actually connected in this configuration but it does not affect the overall description of the circuit operation

I’m from Grenada in the Caribbean. thanks that was some great explanation Man.Would love to see more amplifier repair videos

Am from KENYA 🇰🇪 I really love your videos... I appreciate your understanding in electronics and the way you teach.. Thank you so much

The bridge mode explanation is great. You can calculate from your example that the same current would be drawn by the speaker if it's impedance was halved, or 2 Ohms (14.5A.) This is exactly the reason why it's said that an amp "sees" half the impedance when you bridge. It's because the current is doubled for the same impedance when it's bridged. Love your explanation of this concept that's completely lost on many people.

You sir, are a dying bread. I love you videos and your logical progression.

Hip Hip... Huuurrrreeeyyy! 🥳 Amazing video Richard Sir 🙏🏻 kudos to your work and your reverse engineering. I’ve learned a lot from your videos ❤️ many love for you from India 🇮🇳❤️❤️❤️

Loud & clear ! since I met your channel i learned a lot . Thanks anyways. Keep itup !!

Hello there happy New years by far the best video I have ever seen in my whole life the way you draw out the amp board circuits and the way you explain what they are and how they work hands down you are the best teacher and I've learned a lot from your videos keep up the good work God bless you

great video Richard I especially liked the explanation using the photograph of the circuit then drawing on the photograph with multicoloured lines really helped me to see what you were saying and it was a lot easier to follow and understand. I think this would be a great teaching aid in future videos. as it's more visual. when testing an unknown amplifiers, is it a good thing to check to see if there is any DC on the speaker output terminals before connecting the speakers to the amplifier, this would save blowing the speakers. would just doing a resistance check eliminate the need to check for DC?

Great job. Greets from germany.

Your videos are a wonderful resource for learning electronics… thanks!

In my house that is called a "Man Look". "It is NOT in there!"... Reaches in a takes out the thing directly in front of you... This is a "Man Look"... Appreciate the video, The 66309b just turned up. I'll catch the end of this after I swap the fan for something less crazily noisy :) Hope you are well today

I am new to your videos and am sold. Going to watch many more and hope to learn much.

I love your videos, and as a Learner I loved the use of the colored drawing on the video to explain The use of the amplifier sections, It would be great if you use this method in future videos on the amplifiers.

Love your videos covering various consumer electronics 👍

i'd love to send you a few blown amplifiers in different classes if you want to open and fault find them. i dont mind if they dont come back but it would be nice to learn about the different scenarios and their solutions.

great great!!! work you are doing, the theory and practical point of view is so excellent, keep up the great work, thanks you for being such a great inspiration in the world of electronics.

Great Video, on a subject that's new to my electronics skills, I've build some amplifiers many years ago. Keep up the good work.

Nice video, the PSUs in these are usually push-pull on the primaries

I have 1 of them at home here. I was going to the parts inside for other projects but I think il keep it now.(to be honest I completely forgot I had ot until i saw this video) it's working perfectly and I was going to pull it apart just for a few Op-Amps and relays. (Stupid silly me 🤪) glad I saw this video coz I think i'll sell it now. 💶😁🤑🥳

Richard, You are awensome!

Another informative video 👍

Heya oh yes seeing and understanding everything after your explanation thank you so much

We need some BAREVIDS and LEP collabs! Both in the UK and both very smart guys!

lovely cover

Love the repair videos, thanks... Can you make a video of repairing inverters since more and more people are switching over to solar installations😆

Regarding the PSU section: Can anyone explain to me where the AC voltage to the transformers comes from? Since it's a car amp it would have DC power coming in; We are talking about rectifying the current coming out of the transformers, so how does it become AC in the first place? Thanks!

another great video, are you planning to do video about using oscilloscope to fix electronics?

Excellent explication!!!!!! Thanks!!

That old school Hertz looks similar to Earthquake's PowerHouse series. (the green color ones)

Hello! can you help me? I have a problem with one of amplifier, sine wave output is in the noise (noise is 0,520v wthout any signal) (replacing change amps can (but too cant) help for a moment with clean sine wave, but after 1-5 minutes sine is back to noised sine wave. What is causing this problem? RCa input is clean. After my test with third amplifier, for a moment i got better sine wave in second amplifier, The problem: Amp blowing speaker much before distortion output, bass is weak / weird, flexing car but i dont hear and fell presure, Wave sine on out amp is rippling like Phase reverse - back normal - reverse - back normal itp. In warm temperature sound (bass) can be much better for a few minutes only. Or sometimes multipe disconect power wires can help back clear sine wave Which issue fits this problem? Input noise, Resistor noise, Thermal drift. And how to solve this problem. Thanks!

The only thing I can add right now is that normally multi channel amplifiers are normally A/B with the D class normally single channel for subwoofers.

GOOD VIDEO

New Video... Woohoo! let's Go!

Hi, I have a question for you, I have a 1.4 lt diesel fiesta, long story short, it has 4 glow plugs 11v each, they are connected in parallel, the new ones I have, have 1,8 ohms resistance on each, if they're connected in parallel, ie 4x 1.8 ohms what reading should I get with my ohms meter, would it read high or low resistance when measuring all 4 in parallel?

very informative........😍

43:29 7915 and 7815 directly from the transformer windings (AC)? I think you forgot the diodes.

I love the layout of that amp i have never come across one like it. The ones i hate are the ones that come in with the faut wont come out of protection and there are no shorted output or psu power devices . i am shore there is a simple logical way to fault find but i have not found it. i only look at them as a favour for freinds but am considering saying no . i want keep what little hair i have left.

Do one on the old Carver car amp.

Most of them I have repaired had trouble in the PSU. Often they were installed with power or ground wires too small.

30:41 - could you have used an octopus and lizard juice patterns to understand these connections sooner?

The power supply fet are not drawn correctly and also the rectifiers but because of his first time doing a car amplifier I can understand his mistakes but good attempt still

Hertz is actually a very good brand of amp. Very pricy. You got a great deal at 15 Euros.

I have a pdx alpine 1100 amplifier as I installed it cuts in and out , anyone know how to get it fixed I’m in canada thanks

sounds like a earth hum on that amp . Could that be a power supply problem or just my old ears?

Hi Richard I think your schematic is wrong. You draw the schematic of a buck converter, but the amp has a boost converter. The difference is, that in a boost converter the current goes into the magnet and then to the switch. But in a buck converter, the current goes in to the switch and then to the magnet. They do not have the same block diagram...

Do You have a yt music playlist with the music You use for testing amplifiers?

If you are not using it any more can you please send it to . Please and thanks.

Any chance you can fix your microphone next 😀🎤

These are the big stinky boxes that wake you up at 3am going buuuuuuu buuuuuhhhhh bbbbbooooo buuuuuhhhh a block away

It's hard to get into the rhythm of your explaining\teaching, when every minute I am confronted by an add block the view of the PC board that you are exploring! Too many ads.

I thought queer electrons blow all the fuse's? lol

You will just have to pay more next time and get a broken one. 😁