Fixing a generic 8500Wrms subwoofer amplifier BVDU #7
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- Опубліковано 10 лют 2019
- In this one we take a look at a pair of Zenon 8.5K boards, one with a blown power supply, and one with a blown output. Fortunately these repairs were very simple without any complications, which was perfect to guide Brad through with. The amps do however have a very badly optimized power supply section, which we will look at in more detail in the next video!
wow you are are a great teacher sam! every time I watch an amp repair video I learn something new!
Nice vid, i really like how you were able to explain what is going on with each step of what you're doing in a manner that makes it relatively easy to follow along and understand as you go.
I just love looking at you repairing stuff, it's easing the mind for some odd reason, even though I do not see myself doing it. Thanks so much for the content!
Another great repair and excellent explanation. Nice to see Brad getting some one on one mentoring. Great work Brad.
Man I love this kind of stuff. Took me back to my younger days. I still try to play techie but a bit rusty lol ..
The YT algorithm recommended your channel. I started to watch your video's this week and I just subscribed! : )
I don’t shit about these amps and the the way you explain it, I totally understand it
Great !
You need a proper desoldering tool like a FR-301. But it may not have enough for the large pads of these amplifiers. Really liking these videos.
I Inspire to know as much about my hobby as you and h1nicolas do one day and thank you for your videos
Bad design on the power supply you say? That proli goes hand and hand with a dual input 8.5k board lol.
Get yourself a desolder gun, its so easy, Time is money and less lifted tracks, Mind you I use a pump and wick but I only fix things for hobby but yeah I have a rework station too ahd the scopes, psu, and more lol
Amazing amplifier. Feed it 60Hz from a signal generator and power your home.
Ur a mad amp guro cuddos man show more repairs when u can love it
I have across a few amps doing that well. I modified the drive circuitry to reduce ringing, current draw and improve pulse current output. I don't know if you modify amps as well though. I rebuild and mod them and its so much fun!!!
Congrats on 38000 subs mate
You may have to check the dead time on the PSU driver, you may need to increase it, looks like crossover conduction. Leaving that ringing on the PSU is not a good idea. Are there snubber circuits on each bank of the PSU in the amp? Increasing the resistors to drive the MOSFETs will decrease the rise time and attenuate the ringing, but you will have greater switching losses. What is the frequency of the ringing? You could try using some ferrite attenuation beads on the gate of each MOSFET.
Could be because of the low input voltage .if you increase the voltage to 12.5 the amps would drop.
Another great video thanks sam!
Good day bro, I have a question - If all of the power supply FETs are removed is the amplifier will still powers up with the power indicator light turns on? I really will like to know.