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Amplifier repair - How do car amps work?? Part 1

Опубликовано: 22 авг. 2017 г. 268 760 просмотров

So this is what i've been busy with for the last year or so. I have taken my time and learnt amplifier repair, and I actually find this pretty fun and rewarding, as a problem solver. Plus i get to see a whole range of different amps from different brands, see how they work and bench test them. I wanted to make a video going through the real basics of how a class D mono car amplifier works, so that you can get a better understanding of what its doing in your system.

Comments
  • WdB
    WdB Год назад Fantastic video. Really well documented and explained! I think I will have a go repairing my Velodyne subwoofer amp
  • Blind Fold YT
    Blind Fold YT Год назад yo i love your video's! could i please get a shoutout??
  • Nathan Mills
    Nathan Mills Год назад WorldsDeepestBass which sub? I've a couple dd15's that need boards serviced. Sux that Velodyne quit servicing my model :(
  • WdB
    WdB Год назад Nathan Mills I'll be servicing my SPL-800i
  • Hans Packer
    Hans Packer 11 месяцев назад I completely agree with this comment. A super clear explanation.
  • Ryan Montierth
    Ryan Montierth 7 месяцев назад I am totally knew go learning the inner workings of electronics and am 11 minutes in and got to say, I love this video already. I do have a question though. When the signal coming out of the mosfet is 12 on 12 off, does that actually make alternating current as stated, or does that just make it a switched DC current? I've done car audio for 20 years but never actually opened an amp and replaced it, just changed defective ones. I am truly interested in and always have been interested but never really thought about finding a YouTube channel and not too big on library books so I'm actually super excited to find this channel and some similar ones. Thanks.
  • Anthony Volkman
    Anthony Volkman 6 месяцев назад Boy class D can be fun alright! The biggest amp I've rebuilt so far is a 10 kW amp. It was a beast. All PSU fets, GDRs and GD ICs were blown. Nightmare at Volkman Audio Repair but got it done. I love your vids BTW. It's actually nice to watch them just to kindof "brush" up on my skills. To all out there that are watching this vid wandering whether you would like to persue this line of work (in my case 13 years), keep in mind you will never stop learning. Amps are constantly being improved upon regarding components design, quantity, different components used, different layouts and such and just how everything correlates to each other. For me electronics is a whole nother world, it actually looks like a city and it's great. Best if luck to you all and thank you for the excellent vids! I will be starting uploads of my own amplifier builds (and yes I am am actual business owner like him in the video. I'd be glad to rebuild, build and modify amps for you all. And all other car audio needs.
  • D1 AUDIO
    D1 AUDIO Год назад great vid! and I wonder how you give this much info openly cause when technicians repair them, they don't even let you see, cause no one would give their knowledge for free, so hats off to you man...👍
  • Josh Hanson
    Josh Hanson Год назад Please do a part two! Awesome vid! 2 thumbs up!
  • Matt's Shop
    Matt's Shop Год назад This video is the best amp repair vid on YouTube! I had to do the exact same thing to my Hifonics amp when it blew. All Mosfets, resistors, driver IC, driver transistors, bulged caps. I had to figure it all out on my own with a little help from forums here and there. This vid WILL help ALOT of people!
  • prodigalus
    prodigalus Год назад hello. i have a couple Samsung subwoofers that interface via wifi to a soundbar.. but i don't have the soundbar. is there any way to hack these active subwoofers? they have no aux input, but there has to be a way to bypass the need for the soundbar? any thoughts?
  • Benjamin Zacharko
    Benjamin Zacharko Год назад prodigalus I myself am trying to do the same thing. Im led to believe through some of my own experimentation that there is a tracable input point on the driver board(s) that has to interface with the output of the radio board (usually Bluetooth). With a Nakamichi NK12 wireless subwoofer... I simply gutted and plugged the enclosure to a passive state to use with a small car amp on a computer PSU... With a boston acoustics tVee20 woofer.... I had to trace the signal source and solder in some RCA wires and MacGyver a filter to it so it could receive a smooth signal. Perhaps I should post a video now that I see others are curious.
  • prodigalus
    prodigalus Год назад yes, please!! and there has to be a way to use the crossover, right? i have 2 Samsung subwoofers, which were $1 apiece, so i'd love to use them lol. i know that they were sold at that price because no one knew if they worked, or how to use them.. and it has to be possible. and btw, please link me when you do this video. any idea when you might do it?
  • Encho Enev
    Encho Enev Год назад Awesome explanation bro! Keep up with the great videos :)
  • Ryan Zimmerman
    Ryan Zimmerman Год назад Where can I send my hifonics amp?
  • barevids
    barevids Год назад are you based in the UK?
  • Ryan Zimmerman
    Ryan Zimmerman Год назад barevids No. Us. Could you tell me how to fix mine? If I email you a picture of it?
  • barevids
    barevids Год назад Ryan Zimmerman I don't do one on one repair assistance for free currently. if you watch my recent amp repair videos you should be able to give it a go :)
  • Ryan Zimmerman
    Ryan Zimmerman Год назад barevids ok thanks I took off the first clip for the voltage regulators and one was cracked😂😂
  • stuartmp1974
    stuartmp1974 3 месяца назад Wow. What a awesome, Well comentated repair video. So looking for to watching part 2. Learnt so much for this. Thank you for sharing your knowledge.
  • miguel cannegieter
    miguel cannegieter Год назад Wow Sam's back! Great what's up bro? Great vid man also bro well needed.
  • Kev31779
    Kev31779 Год назад Get yourself a Hakko 808 or equivalent desoldering gun. It makes short work of pulling those Mosfets. Saves tons of times on large amps like this.
  • paulinator216
    paulinator216 1 месяц назад and clean the tip, that is definitely neglected
  • O F
    O F 6 месяцев назад Oh man thank you so much for this video! You get straight to the point and make it all clear. Well done. Your work in making this is very much appreciated.
  • Cody Hodgson
    Cody Hodgson Год назад so you say that this is something your doing? as in a service your providing? i ask because i have a couple of amps i would be willing to pay to have fixed
  • barevids
    barevids Год назад Yessir, UK only. Shoot me a message at spllab.distrouk@gmail.com if you'd like me to have a look at something for you.
  • Carl Kjar
    Carl Kjar Год назад Cody Hodgson ppl
  • Carl Kjar
    Carl Kjar Год назад Ok ll
  • Carl Kjar
    Carl Kjar Год назад barevids to be in a couple weeks I I am trying now I just got your text ok I'll let her to the hospital like a great time I completely honest Ok I'll Ok I'll ok Ok Up forward o ok mmo me ok on o
  • ratgreen
    ratgreen Год назад Also you should make an amp repair series. Record you fixing amps, and how you fault find and repair etc. Would be awesome.
  • barevids
    barevids Год назад Haha i was thinking about doing live streams like Louis Rossmann. Would need to re-jig the workshop and buy some streaming gear and close up cameras though.
  • JaMarvelous jmar662601
    JaMarvelous jmar662601 Год назад Love your videos so I say this in no disrespect; you said 12v is good for car speakers and later said that it is no good. I love the video concepts, I've learned a lot. Good teachers start with a lesson plan and go from there to keep confusion down. Keep em coming
  • barevids
    barevids Год назад Did I? Where abouts lol? 12v is definitely no good for any speaker as it will just pop the cone up and stay there haha! I talk quite fast so may have misheard.
  • Rover Waters
    Rover Waters 8 месяцев назад you not having electronics degree makes you explain things really understandable for the uninitiated
  • nik kyng
    nik kyng Год назад what are the causes of amp going into protection ...what to look for i have always wanted to fix my own amps
  • Blondie SL
    Blondie SL Год назад Often that's caused by excessive heat. If you can measure heat, check that on the heat sinks. If there are no heat sinks, then you may need to add some.
  • Gavin James
    Gavin James Неделю назад Thanks for this video! I will be replacing the supply mosfets on my jl 500/1 and I will definitely use some of your teachings!
  • Spider Mcgavenport
    Spider Mcgavenport Год назад Question Peltier cooler on mosfets? What would your amps performance be if it was liquid cooled with the Peltier device on the reservoir?
  • Dave Micolichek
    Dave Micolichek Год назад Spider Mcgavenport it would still have the same power. May just be more reliable, maybe. The stock heatsink should be able deal with the heat.
  • Yaghiyah Brenner
    Yaghiyah Brenner Год назад (изменено) I see your knowledge has grown, I like your enthusiasm on the subject.
  • barevids
    barevids Год назад Thanks buddy! I know that's an inductor - I wasn't suggesting it was a transformer, I was going to say "transformers and inductors" but the snapped lead took me by surprise and I never finished my sentence haha!
  • Yaghiyah Brenner
    Yaghiyah Brenner Год назад (изменено) sorry, I watched your video till the end, you probably made a mistake talking about it. Iv'e been doing so much research on this subject and came to the conclusion they (the manufacturer) blow the whole stage deliberately. if they wanted to, they could to trip the circuit when one fault is found. i.e when one mosfet is problematic, so one effects the others (i.e they draw more current then they should and blow)
  • barevids
    barevids Год назад Yes youre probably right, it doesnt help that these board designs are absolutely ancient technology and the protection circuits awfully slow. On the contrary, the more recently designed Brazilian full bridge amplifiers are awesome for that, if they blow you only ever lose one pair of outputs and maybe the driver, the protection circuit saves the rest - and ive yet to see a power supply section go down either on the Banda amplifiers, the protection is so quick! Its definitely the way forward.
  • Yaghiyah Brenner
    Yaghiyah Brenner Год назад Interesting research. From what iv'e been seeing through the years is that the manufacturing culture in China is, copy and paste innovation, they trade IP for IP, not like the western world that protects IP with patents example: RockFord Fostgate, JL Audio Ect.. In china schematics are in circulation for trade, so the same problematic circuit is found every time as a result of the IP trade and brute force component cost reduction to a point where its a fire hazard product.
  • dee brown
    dee brown Год назад Nice works guys and were can I hide my amp in a 04 dodge grandcarvan any one ????
  • Glide
    Glide Год назад would it fit under the back seats?
  • Technologic
    Technologic Год назад (изменено) If a bipolar power supply isn't available they use an H bridge output section with the output filter connected between the speaker and the FET sources/drains such that: .+V...................................................+V ...|......................................................| FET.................................................FET ...|-----FILTER---SPEAKER--FILTER-----| FET..................................................FET |.......................................................| GND...............................................GND during switching you flip the side of the speaker that is positive back and forth on each cycle of the square wave to give the speaker a bipolar sine wave such as +--FILTER---SPEAKER--FILTER--GND then flip it to GND--FILTER--SPEAKER--FILTER--+ advantages of this is you don't need an 80V (+/-40V) power supply, you only need +40V for the same power, and not needing the negative rail makes things easier
  • barevids
    barevids Год назад Technologic great explanation! many of the newer amplifiers are adopting this method, keeps the component count and cost down. I'm seeing more and more amps with just 640n on the outputs as opposed to 640n/9460 banks for positive and negative rails.
  • Rui Kazane
    Rui Kazane Год назад the Rail power on Fosgate amps, the newer Punch BR series?