Amplifier repair Part 2 - Output section & Bench testing!
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- Опубликовано: 1 окт 2024
- NSVaudio
So in this final section we tackle the remainder of the power supply and the output section. There was quite a bit wrong with this amp but surprisingly the driver survived which made repair that little bit easier.
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Excellent demonstration of intellectual balance, you did an amazing job explaining some of the science involved in amplifiers and showing it with good visual references. It is good also to see that some people still exist and even thrive on repairing electronics. It's an very expensive amplifier and is a quality unit so to repair it definitely makes sense, Its good to know that it could be repaired even better knowing there is someone who can repair it. At any cost my man I'm sure you are worth it, thanks for sharing. Love from across the pond my brother
It's a pleasure to see a Brit show how things are done. Well structured, plain English, non-condescending, matter-of-fact delivery makes a mockery of other repair "tutorials". Inspiring. I've a Nelson Pass designed Soundstream A50 which is in need of attention. Despite my limited experience, you have given me confidence to attempt at least troubleshooting it. Thank you for a genuine production aimed squarely at providing relevant information in a digestible format. If we all were so sharing, the world would be a much better place! Much appreciation 😊
I want that 45 min stress test ! Don't tell me how wierd I can be on YT :P
@barevids You have some serious talent man.
Best car amplifier repair video on RUclips! Nice clear voice and attention to detail. Great job! 👍🏻
Superb videos. I enjoyed every second of them👌👌 and i really would like to make same video in Finnish, just to spread the knowledge of car audio. If you don't mind. 🙏
These videos are very helpful, & I have just bought an HP 554602B 150MHz O-Scope like yours, & a variable power supply & hot air station and a bunch of other things & I'm really tiring to learn car audio amplifier repair.
Louis Rossmann for amplifiers daaamn
Nah, Louis Rossmann is way more emotional in his videos than him. Which makes sense in light of the fact that he's repairing Apple stuff :D
wahahahaha
Not even close.
Or he claims so and is swearing to god that he actually does apple repairs in real until become a web personality and earn money from talkings and promotions.
Best tech porn ever for a bass head.
Petter Danielsson Ay BassHead!
Thank you for the excellent level of detail! Your accent is particularly pleasing to listen to from the USA. Far less aggravating than our own domestic accents. Subscribed!
I thought it was Phil Collins..
I have seen many repair videos that try to explain but you are definitely the best. I have learned more on these two videos than in the
Last few years of other videos.
Only 1 year of experience at the time of making this video absolutely blows my mind! Brilliant video mate!
It makes me so happy to see tech being restored by someone who knows what he is doing
Awesome work! You've got yourself another sub. I'm amazed that RS is still individually packaging components, used get right on my tits; ended up buying from Farnell instead.
I’m glad you started with an easy fixable straightforward repair 🤣
After more than an hour 35:42 “Ok, so now for the *interesting* part”.
Never knew what a chisel is for. Now I do. ;)
In cold weather you don’t need to put on the heater just power up the music. Lol.
I enjoyed the full 1,5 hour explanation to the fullest. Just incredible how you talk us all the way through this awesome repair. Tx!
Great job! I've been doing this now for about 10 months and I love it. This was a great 2 part video. This is by far my most favorite vid you've done. You have lots of great ones but this helped me a lot. I would love to learn more about how to fix an output board in the future. Thats where I'm having all my problems on my repairs, I just don't know enough about the ic chips.
Why are they giving such ridiculous numbers? There is no way in hell that this thing is putting out 4kW of power RMS! Where would it even get 4kW? It's all marketing mumbo jumbo.
I got a 5k with a failed output section anyone out there can walk me through it. Rail voltage is fine but I'm not getting anything from the output section
@@tarstarkusz Oh it's doable, however for continuous operation I would be seeing FET's with rdson values lower than 10 milliohm each. At that point you are paying hundreds in just FET costs alone. Also I would be seeing ETD59 cores at 75khz or ETD49 cores at 200khz for that power level with single turn center tapped primaries, not toroid cores.
+Robert... Even assuming you could hit such numbers at a particular peak, why would anyone want to do so, especially in a car? You are never even a meter from the speakers.
Instead of paying for such a ridiculous amount of power, the money would be much better spent increasing the quality of the components.
@@tarstarkusz (I'm not talking about peak power, I'm talking RMS in my supply designs.)
Because of space. With T/S you have three options and you can only pick two:
Small Box, Efficiency, Output. Power is cheap, space is at a premium in a vehicle.
Personally, I've got two 21" subs that at 100 watts each in a 55 cube box each will produce around 140 db on a calibrated mic. Unless you have a school bus that is walled off, this isn't possible in a vehicle. Thus you go with a lower total Q driver which must have lower efficiency for a smaller box at the cost of increased power. I don't like it either man, until subwoofers utilize mechanical servo control instead of electromagnetic control this is what we have.
You should do a video showing how to test each component of the amplifier and what they are supposed to read.
Well done on this repair. Really enjoyed watching you go through the process. Looking forward to watching some more videos from your channel 😀
We are all good in the hood - this one is good👍. Nice lab, I like your 'scope, can't do D-class w/o it, very useful when fitting Mosfets that are slightly different than originals. One the best vids I have seen and you are knowledgeable. You're slightly nuts - bench testing, sh.. I would be slightly scared with that much power.
one of the large electrolitic capacitors on the left near the fets has gone bad !!! you can see it starting to bulge under the plastic protective cover........that amp will fail again shortly because esr went way up :( 41:35
No, I checked this at the time and the plastic insulator is just being pushed in from either side by the wrap. The cap top is perfectly flat and not bulging. You see this all the time with these amps. And as testimony to that, this amplifier which I repaired in the video is still working brilliantly to this day, being run at 0.5ohms daily.
well then i stand corrected...... you are a true master of the black art woodoo known as electronics repair :) jk. keep up the good work keeping quiet households and cars a thing of the past!
I've got a bang and olufsen Lear amp on my audi s4 problem is the front door speakers don't work. Where would you be looking first for only the front speaker no sound? The rest of the speakers and sub work.
Thanks for your videos I'm watching and learning with you. 😊
I'm a certified Rockford Fosgate Basshead and Tech Fundi , best video i have ever seen , well done Mate , all the way from South Africa.
Cheap amplifiers rely on manufactured lots of MOSFETs. The higher end, professional grade MOSFET banks are "matched" MOSFETs, which are VASTLY more expensive, and provide higher quality audio fidelity.
Hellow bavrevids amazing videos congratulations.......
i have a sherwood ga1072bp who bloow the fuse then i find a diode 1n5402 shorted i think is a protection diode i change it and i have now 12v in the drain mosfets when i put the remote but the oscilator ci494 do not have 12v in the pin 8 i get only 7v and in the output pins 10 and 9 who probably must have 4.1 to 4.9v i get 0.2 volts , i check all mosfets in the power secion and resistors and nothing in short or open i check also the transistors swicth for the gates and nothing, i do not have any output from the bobine of course cause i do not have oscilation or frequencie in the 12 volts, any idea please? do you think maybe the oscilator ci494 is bad? Thanks in advance.
Here I am looking at videos from 5-6years ago because they are so informative. Ive brought back 2 cheapo Amps thus far and doing a few more (currently an older KX1200.1) before I try to dig into my DD Amp which you suggested this in another video where you repaired a DD-M4c (i think)... I noticed you used a chisel to secure the FET clips to the heat sink. My question is: Should you use a chisel or something similar to secure the FET clips inside of a Digitial Designs D series Amplifier(D5.1000)? Or what did they do from factory to get them so darn tight and difficult to remove?
Hello, i want to send my pyle of crap amp to you to fix. Or learn how to fix it. Its missing 2 channels on an 8 channel amp. Its a pyle plmra830bt 3000watt 8 channel bluetooth. What would you suggest?? Any help would be greatly appreciated 🤙🤙
Pretty well above whats taught..your showing the tricks of repairing with current and/or voltage limiting..you can find mods to common circuit mistakes.. yup..the asians dont like you .. hee hee.
32:00 Time to break out the larger diameter solder for those larger pads on the inductor!
If everybody knew how to properly use a car audio amp and we stopped by shit brands like Banda, Taramps, TC sounds, and the tons of china crap like crunch, power aqoustic, etc this guy would damn near be out of work except the occasional accident or manufacturing mishaps. I would wager 85% of these amps are user caused by over loading them or low voltage or mounting them to weak boxes and I say that because if you have a box built like a tank your good mounting it to the box. I got a bulldog box I had built with 1” wood and coated with Rino liner and you can feel the back of the box at full tilt and it’s not vibrating anymore then the rest of the car expect the stuff in the cab obviously yea it’s shaking violently. Also I got a DC audio 2k and it’s been screwed to that box for years and I have never had any problems hell of it went now I wouldn’t feel bad I have used it so long. And I got a HD1200/1 that’s 8 years old and it’s been three hell and still is playing like new. I believe it will last 10+ years and if it does mess up I will send it back to JL to be refurbished. To much money to just toss it. $350 is a lot better then $899.
Great info. I am pretty good at electronics, but I'm not as advanced at engineering/repairing as you are. Viewing your video taught me a lot and has some great advice for EVERYBODY who does electronic repairs. I especially liked the tips about testing burnt circuit boards to make sure they haven't become conductive, also carefully checking for tiny solder bridges. Even if you can't see bridges, a lot of electrons can flow through them, instantly creating a bigger a disaster. Fantastic work and safety habits.
The ungrounded low current power supply trick was brilliant too. That was a new one for me and I'm sure it will come in handy one day soon. Thanks so much for everything.
I'm loving your vibes very much I was learning electronic in the 80s as a teenager back then in Jamaica there was a lot of things I didn't understand about amplifiers that u made clear to me now thank u
I appreciate your enthusiasm! Given the accent, if you spoke any faster I would probably miss several words but as it is I understood you just fine. Thanks for a fine video.
do these power supplies have a RC Snubber on the MOSFET Drains?
Do you have any schematics or help w a JL audio M1000/5v2. Any help would be appreciated.
I do have one comment, all of the people like yourself are showing the world how to fix and build the stuff but as u see I am from south Africa and there's no parts to make or build here and if there is its f....n expensive. But great show thanks. I have about R40 0000 invested in sound and still have problems
I dont know much about amp repair but i have a kicker zx 350.2 i got from
a customer. Who bought a new amp and was just gonna traah if so i gave him a nice stinger fuse holder. The amp had no output it light up just fine no protection light.took it apart no smell of smoke or heat damage everything was tight however i recently was looking on the back side of the board and came across 1 transistor where the solder from each leg had pulled together making all legs 1 common connection. Is that normal of a sign of over heating?
I have a diamond Audio D3 400.4 that powers up blue light but has no output signal. I have been looking for a schematic for it but have not been able to find one. Do you have any idea where I could look thank you
hey im testing some mosfets in my amp using a multimeter on continuity mode and im getting intermittent continuity from the source and drain... also the gate and the drain pins...so does this mean that the fets are bad?
No, if it beeps but then the values climb then you are just charging caps on the board. Only if you have constant low value reading under 100ohms does it suggest there is a fault. Usually in a bank, if one fet it sorted it will read 0 between gate and source, and all the others will read double gate resistance, due to that one being shorted. Remove the dead one and you can power up and test.
yo@@barevids thanks..so how do you determine the gate resistance?... is that the reading you get when you probe between the source and the gate on a different bank that is working fine? also if you remove the bad fet, you need to replace it before you power up to test it? or would the amp function if you remove the bad one and don't replace it? so if there's a constant reading of under 100 ohms between the source to drain and the gate to drain pins?
Great video as usual. @4:15 It's not regulated at the moment, if it was regulated the duty cycle would drop to zero as there is no load. Also, because the regulator part of the circuit is monitoring b+ or b- and you have removed your diodes for testing there is nothing to monitor. You are seeing the soft start circuit which is used to minimize stress on fets and diodes while charging the caps from not to whatever the rails are. The controller board is a neat one on this amp as it uses 21844's, half bridge drivers that are intended to be used in mains powered equipment and I believe they are being fed by a discrete osc. pretty cool.
Freakin’ excellent vids. I’ve been debating on getting into amp repair also. I learned a lot. Thanks! 🔊🔊🔊
u r more skilled than me bro ive jus repaired a lightning audio small amp had protection probz an found it was the ground wire off the board easy compared 2 yor repaired cheerz bro fanks for the vid had it playing while i was repairing my amp
I always like the way you explain and do your repairs, i have a jbl some of the output transistors were out of range i left those that worked inside the amplifier but the rear channel won't work only the front
New subscriber here, awesome channel!
can i change leds board on gto6000 to a mini chinese oscilloscope lcd to see limites better ? i dont see good in video where u link oscilloscope... i dont find plans of the gto6000 online... im not sur components are originals... where to find shem of jbl old amp?
Hope you still out there just seeing videos alot off help liked the you explained been electrician for 23 years been playing way longer than that
I've seen a lot of transistors fail due to broken connections. This is due to not just vibration but also from the expansion and contraction of the heat sink they are bolted to. I've found that before cutting the pins down to fit, bending them with a jig stops this.
All you need is a 10cm x 10cm board (piece of plywood), a 4 or 5mm dowel rod, a wooden ruler and some screws. Split the dowel lengthwise, sand the flat surface and glue to the center of the board.
To use it, screw the transistors to one side of the dowel with a gap slightly wider than the narrow edge of the ruler between the edge of the dowel and the surface of the transistor. Don't tighten! leave the legs to hang over the dowel snug but not tight. With a downward motion from slightly over the dowel use the narrow edge of the ruler and push down on the legs until the transistor body sets flat. Hold the ruler in place, use another piece of wood or plastic to bend the legs around the dowel giving a semi-circle bend while maintaining pin configuration. Now trim and install.
This is good advice and I wonder why no manufacturer does this although even some component manufacturers advise for it. On some old power amps I have even seen the output transistors just bolted to the heatsink and connected to the pcb via handsoldered wires.
Were you being paid for the repair?
Nice one.... Where do you buy original components?
gais i have a chaina amp and i by accident i giveit more volt that it supposed and as acous the equalizer light are being tern on and of so what dose that min and how to repair it please helpme gais for the shet i dont have any amp but that one its 80 watts and 11.35 volt
Hi could anybody tell me the part number of the outputs mosfet drivers of this amp.?
I think you lost me at mosfet...wizard work though.
thank you for taking the time to do this vid.. i would love to learn this stuff. your the man.
yes sir as a technian i learn alot from your channel thank you for ur videos
Sorry if i missed it. But what was the cause? I have a similar situation but i have a few caps included.
actually in a switching circuit mosfets won't try to power eachother,so they don't have to be matched.I have even used different model mosfets together without issue in switching circuits,apart from that,great video
PetruV thanks dude, always adding to knowledge of finer details ☺
too right. Thank you for your knowledge and time
I concur with this. Since class D doesn't bias the mosfets. Furthermore each fet is balanced via the gate resistor which is why each gate has a resistor rather than one resistor feeding a bank of fets. This is to balance the on signal between fets.
see i still don't agree with this. The mosfets Drain pins are still paralleled to an inductor. if the mosfets in a parallel bank have significantly different Vg, which is the voltage required at the gate to switch on the fet, then some with turn on before others and since the drain pins are paralleled, that high voltage across the switched on fets will also be present at the drain pin which is yet to be switched on. this may be near or beyond the backwards voltage rating from drain to source. I have experienced first hand using fets of different batches in parallel and they do indeed heat up on idle, meaning something is happening between them to cause this. replace with all identical bank and they stay stone cold.
MOSFET gain vs drive voltage varies minimally.
Vds is not backward voltage, but blocking voltage.
Also, FETs have a body diode for reverse voltages.
There is plenty of info online.
Watch out for Chinese mosfets? Maxxtronics makes there stuff there.
Have you done any home audio amps? Would be curious to learn the difference
i am in the uk i have a focal 5 channel amp with problems do you have a email or number i can ring i dont have face book
What is with the globs of solder on the back of the PCB?
I'm trying to repair a PA 150Wrms 100v line amplifier; the power section is fine (tested apart), but only one of 6 inputs works well, on the others, the signal is massively attenuated and distorted by the circuitery, and cames into the power section very very low, so that I can hear only a whispering sound.
I checked all the capacitors, all the transistor and also the potentiometers, i replaced even the operational amplifiers IC, which were damaged, but it's still the same...
What I'm missing? any suggestion?
P.s. I subscribed, and it would be very nice if you will make more videos like that
So I noticed the mosfets were 300v 38a 85mohm, I believe. Would it be ok to use 40a mosfets? Assuming each set it replaced or would that cause something else on the amp to potentially work too hard?
Update: ok jumped the gun on the question and you be already answered it.
I'd get as low as possible with rdson, 85mohm is pretty damn high. Keep in mind as rdson falls, gate charge will increase, then you have to deal with the thermal waste from charging the gate; sometimes this can be greater than the switching losses.
What does apply the remote mean when you're powering it up?
Here na I have a blade am an the chip make a noisy sound and the mosfet get blown
Looking at fixing all my amps maybe other people
If your LCR tester is anything like my DMM, the RdsON measurement doesn't mean squat. Even if the RdsON was in the milliohms, the resistance of the probe and clips would be so large in comparison to make the result largely meaningless.
very true, but it still allows me to make comparisons between batches and locate damaged fets as the difference still presents itself!
you may also want to look at Safe Operating Area or SOA of the mosfets you are choosing for replacement. Many high current mosfets only handle high currents at low voltages. and a given device while rated higher current, may handle LESS current at the voltage you intend to run them at. you should look at the SOA graph and compare it to the mosfet you are replacing and make sure that you can still handle the power requires AT the voltage they will run at. could save you on a costly repair!
excellent video, great information and explanation, where is a good source for schematics, (obviously google?) just wondering if there is a hidden gem website
Excellent video, showing me a schematic would have greatly helped. So mOSFETs on the output mean this is a digital amp? And the four coils or use to remove the high frequencies going to the speakers? I just needed a little clarification on that part
Hmm I wouldn't say digital as such... Although I guess the sine wave is built in pulses... But digital usually means the amp is pic controlled with some kind of firmware. And there is actual data being transferred.
The first two transformers are to convert 12v into +/-rail voltage. The second two are Inductors to filter the rail-rail switching that the sine wave rides along.
You are not hassled with fake mosfets/transistors ?!, most failures on attempts to repair amplifiers is consecuence about using fake component and when not caring enough about checking all the stages backwards, balacing, etc.
only a year dam im on year 3 and im still behind mr bare you have some skill
Should I be worried if a single output capacitor in a group appears to be leaking, but isn't expanded at all, and the sound output is fine without any decline in audio volume peak? The amp didn't get hot from overworking or anything, might just be from age and the sun heating the heat sink shell, but everything else inside appears to be solid and in working order.
Geezus! Well informed video. But I must say, that for a newbie that knows almost absolutely nothing about repairing amps. This was like trying to read hieroglyphics.. Lool All those numbers that you keyed in just killed my brain, as I always hated math, which was my weakest subject. Now my question is.. Without all of that equipment you have.. Could you have done this job with just a bottom of the line multimeter that doesn't beep and soldering iron??
How do we contact you to repair stuff!?You could make fortune, if you repaired the appalling Becker Harman Kardon Logic 7.No support on them ... if a 5p resistor blows its £1,200 to £1,400 new unit.These overpriced junk amps litter all the too BMWs and Mercedes.Within a week of mine going I found 12 people in tne forum with similar problems.
Perhaps you mentioned this in another video, when you stress test your amps, what are you meaning? Playing music at a certain level? Letting it run at a certain output? If you could elaborate on the stress test protocol, it would be helpful, I like to establish a protocol for final testing.
30mins of sweeps at 75% output at 2ohms, followed by 5 min of sweeps at clip point at static 1ohm. I also run a high impedance speaker hooked up so I can hear any irregularities in the output.
amazing logic from the start to the end. Love the channel. Subscribed.
just watching you work and listening to how you approach problems and solutions was mesmerizing. its just too bad your not in the states because I would definitely have no problem with someone like you doing my repairs. I have some older equipment that needs a competent and thorough person as you are. my head unit is an Alpine 7949 preamp deck from 1998 and was their flagship unit. also I own an Xtant 3300i 3 channel amp also from the same year. I have not found any other system to match the quality sound they produced. Trying to find a shop or individual to do my repairs has been exhausting. You wouldn't by some chance know of someone here in the US you could refer me to?
Great videos, really enjoyed them both. One very slight criticism though, if it were me doing that repair, i would have taken out the heatsink insulators, cleaned off the old heatsink compound and applied new one. This would give better thermal conductivity. Maybe you did it and never mentioned it? Apart from that small observation, it was a great job!
I have a SPL Dynamics S-4006 amplifier that i got as a broken unit. The amp was notorious for killing speakers in the fifth and sixth channels. I have bench tested the amp with 12volts and channels 1-4 work normally but on channels 5 and 6 there is a lot of humming and other strange noices.. So dc leak somewhere? Any idea what components have broken?
I have only a soldering iron and i am capable of using it, but i dont have a scope..
Great stuff! Is there any schematics of theese kinds of driver boards based on the IRS21844 out there?
Im curretly working on the exact same model as in the video but i figure many other amps are based on the same kind of driver circuit.
So any 21844 driver schematic for reference would be highly appreciated! :)
Also, is there maybe any possibility of describing the troubleshooting/probing of the driver board in a little more detail?
Couldnt really see what you where doing there beacuse of the camera angle.
Anyway, shairing this kind of knowledge is awesome, thanks a lot
Excellent vid, this - with proper explanations of why thing work & sometimes don't. I've not worked on one of these, but I'm guessing Class D with FM audio control? wasn't really covered in the talk.
Just one thing tho': & somebody else mentioned it here. The 'original' inductor has a zip tie holding it down, would have been better to use one on the 'repair' one (as well as gluing it down!). Mind you, the 'original might have been a repair. Either way, zip ties on both would be good practice. Also, if the headers used on the driver board aren't super tight, that might end up falling out too, due to vibration.
Best Damn Instructional RUclipsr of '17! Subbed in two vids! Gave me the correct way to diagnose this old MTX amp I popped years ago. I know it's an AB, but diagnostically, it will be the same steps. I have an AEES in EE and was working on my BEET, but the school was online and I had life changes where I just had no energy or time to continue.. Anyways, your spot on with your diagnostics and procedures far as I can see, your cautious and deliberate and vocal about your actions. Cheers from the US :D
Do you take repairs? I have a blown Phoenix Gold 4 channel (MS 2125) i think, would LOVE to fix it. .
I love learning from really smart people. I'm just a hobbyist who builds micro-controller circuits that don't even come close to the complexity of that amplifier. I've got to subscribe.
I'm having a dumb issue with my amp. It play's and powers on but no bass or subwoofer out put. The 4 channel part puts out all sound but the 5th channel is dead. What should I look for? It is the spl g5 4500d amp. If it helps it says 1ohm stable for sub and I have been running my factory Mercedes Benz sub woofer that says 1 ohm but I measured out at .88 ohm. Any help please a new amp is 1,000$ us.
Really glad i seen these two videos, I have a SPL Dynamics EXT-3000D that I killed about 10 years ago, I might give this a go to repair it myself as when I enquired about getting it repaired I was going to have to send it from Belfast to Mainland UK and the cost wasn't worth it at the time
What would cause the Capacitors in your amp to bust ? I have budget mono amp(planet audio ) , and the capacitors literally burst . It power's up , but when i play the music , my sub would flap out of sync with the music
The inductance of that toroidal is number_turns^2! Without knowing the effect on the audio signal I would have found a way to terminate that winding intact. Enjoyed the video. Maybe you got lucky and the difference is cancelled out by feedback.
I'm really excited to see a horn in a car, got a design for a folded horn in mine that should tune down to 32Hz, my idea is to use the back seat as the mouth of the horn, and have it curve up from the boot lid and over the top gradually expanding. The mouth ends up being 1.3x1m, and the length at 6m. Problem is whether or not I have people in the back seat will affect the tuning. Also, I've heard horns have some phasing issue where the wave doesn't properly form until one wavelength from the mouth, meaning the intensity won't be as high as a ported box even though it's technically more efficient.
At 5:30 you are checking the voltages on the pins of the MOSFETS and rectifiers...can this be done with a multi meter if we don't have an oscilloscope?
I just subscribed. You did exactly what i did on my little 2kw amp when the transformer broke of the board and killed half my psu and a capacitor.... Output stage was fine tho, saved me the hassle. Hell of a good job man, keep it up :D :D
Very good knowledge of electronics and simple and clear explanations. The perfect troubleshooting video in this area. We realize how badly these amps are designed at the base with the minimum protection. Every penny counts in this poor quality design. I speak as an engineer in the industrial field where such a product would not pass the first stage of testing. Your job clearly has a future;)
Can you make amplifiers?
What would cause crescendo 1000c4 to have bad alternator whine for a few secs b4 going into protect ? Power and ground used to power the amp worked great for previous amp
Good job. I haven't repaired and amp yet, but at least now i have more confidence i could pull it off if I had too. I've designed and built many digital/analog devices as a part time EE hobbyist.
Barevids, what an outstanding Video. I have been looking for something like this for a long time. I love electronic and I have a good few car amplifiers that has been damage that I collected over the years. I would really like to see more of these. Where can I find your NSV page?
am trying to fix a pyle 4 chanel 4000wattalready found one mosfet thats not working but not burnt how do you get the mosfet specs
google the part number
3507 watts or voltage or power?
I understand the words coming out of your mouth but I don't understand the words coming out of your mouth. It's sounds easy but then again it seems hard. Very good video an illustration I watch the 1st and over half of the 2nd just can't figure it out.
You need a donation address-this information is worthy of a coffee PROPS & thanks :)
paypal is spllab.distrouk@gmail.com :)
Hi there, my amp can turn on normal but when I turn on my radio, it goes into protect. I've tried disconnecting the rca and reboot the amp. it turns back on. nothing wrong with the sub and I've tried plugging in the rca with the speaker wires out. it goes into protect. help please?