LM3886 car clone

rwaudio · 27th May 2004, 01:20 AM

I built an LM3886 based amp for my house and loved it, so I wanted to do the same for the car. So here's my "car clone" the donor amp was a Crossfire tek 35.4 (not exactly good sounding, and mine was broken) voltage rails are +/-28 to 29v depending on battery voltage, and the amp was capable of around 220-280w rms total so it should do nicely with 4 LM3886 @ 4 ohms..

rwaudio · 27th May 2004, 01:24 AM

And the inside...

jjdche · 27th May 2004, 01:25 AM

I wouldn't mind doing something like this myself, except with some P3A's.

Let us know how it turns out.

rwaudio · 27th May 2004, 01:25 AM

last one..

palesha · 27th May 2004, 06:03 PM

I think u hv used parallel gainclone. It looks stereo. Can u give details ( schematics) how u hv done it without volume control.
Why u hv not used the pcb for 3886? This will help to do the same.

rwaudio · 27th May 2004, 11:49 PM

jjdche, I'd go for it.. I got lucky and the power supply ends and the amp begins all in a pretty clear line, so the cut was easy.. I'm sure other amps wouldn't be so easy.
palesha, it's actually 4 individual channels (to run front and rear speakers in a car) the schematic is one I found on this site (inverting gainclone) and works very well, it's actually for an lm3875 but I just used the "mute" circuit from the national data sheet. there's no volume control because my car cd player has one so it's not needed. I didn't use pcb because I'm just playing around, when I find the schematic I like best (tried 3 now, deciding between 2 of them) I might go with pcb's later on. if you have anymore questions (or suggestions) don't hesitate to ask (advise) I'm still learning, but it's nice this is a fun and fairly inexpensive hobby to do so..

jjdche · 28th May 2004, 02:44 AM

I actually have a 4 channel amp that had one of the channels crap out. I haven't really looked inside it recently but its a good donor amp. Hopefully the power supply will be easy to isolate.

skinnman33 · 27th January 2009, 03:37 PM

Hey rwaudio I know this is a real old post and if you ever see this reply post I would like to talk to you about the amp and how you cut the board in half for the power supply to use. I have never in my life seen something like that ever done and especialy work.
Two BIG thumbs up brother. But please I need to talk to you about this so I hope you get this. I'm a new member so I can't
e-mail you until I do some more posting. Contact me thru this site or I'd rather you e-mail me. Great job!

27th January 2009, 03:37 PM	#8
skinnman33 diyAudio Member Join Date: Dec 2008	LM3886 car clone Hey rwaudio I know this is a real old post and if you ever see this reply post I would like to talk to you about the amp and how you cut the board in half for the power supply to use. I have never in my life seen something like that ever done and especialy work. Two BIG thumbs up brother. But please I need to talk to you about this so I hope you get this. I'm a new member so I can't e-mail you until I do some more posting. Contact me thru this site or I'd rather you e-mail me. Great job!

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27th May 2004, 01:25 AM	#3
jjdche diyAudio Member Join Date: Feb 2004 Location: MA	I wouldn't mind doing something like this myself, except with some P3A's. Let us know how it turns out.

27th May 2004, 06:03 PM	#5
palesha diyAudio Member Join Date: Nov 2001 Location: Pune India	I think u hv used parallel gainclone. It looks stereo. Can u give details ( schematics) how u hv done it without volume control. Why u hv not used the pcb for 3886? This will help to do the same.

27th May 2004, 11:49 PM	#6
rwaudio diyAudio Member Join Date: Jan 2004 Location: calgary	jjdche, I'd go for it.. I got lucky and the power supply ends and the amp begins all in a pretty clear line, so the cut was easy.. I'm sure other amps wouldn't be so easy. palesha, it's actually 4 individual channels (to run front and rear speakers in a car) the schematic is one I found on this site (inverting gainclone) and works very well, it's actually for an lm3875 but I just used the "mute" circuit from the national data sheet. there's no volume control because my car cd player has one so it's not needed. I didn't use pcb because I'm just playing around, when I find the schematic I like best (tried 3 now, deciding between 2 of them) I might go with pcb's later on. if you have anymore questions (or suggestions) don't hesitate to ask (advise) I'm still learning, but it's nice this is a fun and fairly inexpensive hobby to do so..

28th May 2004, 02:44 AM	#7
jjdche diyAudio Member Join Date: Feb 2004 Location: MA	I actually have a 4 channel amp that had one of the channels crap out. I haven't really looked inside it recently but its a good donor amp. Hopefully the power supply will be easy to isolate.

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