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Gainclones in car amp
Gainclones in car amp
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Old 21st October 2005, 07:27 PM   #1
mmmax is offline mmmax  Finland
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Default Gainclones in car amp

Has anyone tried building gainclones as car amp? I tried searching and didnt really find anything. I just thought that with gainclones it would be relatively easy and cheap design. Only tricky part is psu.

Im thinking building one, but the psu desing is open? Are there suitable desings for psu?

All comments are welcome.
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Old 23rd October 2005, 12:35 PM   #2
sousmielie is offline sousmielie  South Africa
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Hi,

Go have a look at Rod Elliot's page, he used gain clones in his car amp.

www.sound.westhost.com

Regards,
Werner
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Old 25th October 2005, 04:42 PM   #3
sagarverma is offline sagarverma  India
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please tell me what is a gainclone amp?
i suppose lm3886 is also gainclone

what is gainclone amp????
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Old 25th October 2005, 07:56 PM   #4
sousmielie is offline sousmielie  South Africa
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Hi Sagarverma,

A gainclone is a amplifier made with a IC. (Chip Amp)
A solidstate amplifier is made by using discrete electronics. (Transistors, etc...)

Yes the LM3886 is a gainclone

Cheers,
Werner
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Old 25th October 2005, 08:56 PM   #5
motherone is offline motherone  United States
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Actually, chipamps and gainclones aren't one and the same. A chipamp is any amplfier built around a power opamp (LM1875/3875/3886/4780, OPA541, TDAXXXX, etc.).

Gainclones are an attempt to clone the Gaincard from 47 labs. The idea is to use the minimum number of components possible to make a stable LM1875/3875 amplifier.

Since 47 labs only uses the LM1875/3875, I would say that only amps utilizing those chips, along with the minimal external components clause above, qualify as gainclones.

Anything else is a different take (most people say "improvement") over the original gainclone idea.

As far as usinga gainclone in a car, I think you would definitely be better off going with a LM3886 or paralleled LM4780 chip for your amplifier channels. Car speakers tend to be in the 2 to 4 ohm load range, and the 1875/3875 aren't really as suited for driving those loads as the 3886 and 4780 are. A paralleled 4780 driving by a quality SMPS could easily put out 70 or so watts into a 4 ohm load, or 140 into a 2 ohm load.
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Old 26th October 2005, 04:17 AM   #6
sagarverma is offline sagarverma  India
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thanks for reply.

well i have 2*tda7294 with esp smps in my car driving two woofers and tda1554q driving two speakers in a biamped setup using esp 12db/oct lr xover.

i had built lm3886 also and also lm3876tf.both are really wonderful.recomended gainclones
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Old 28th October 2005, 06:24 PM   #7
dito is offline dito  Brazil
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Default pictures?

Can you show pictures? I would like very much!
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Old 29th October 2005, 04:19 AM   #8
sagarverma is offline sagarverma  India
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as i told ya all in my car.

but my lm3876tf pics can be seen on
http://www.diyaudio.com/forums/showt...threadid=65466

will construct a tda7294 amp today as well as the smps.will post pics at night
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Old 29th October 2005, 10:58 AM   #9
dito is offline dito  Brazil
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Default Good work!

Congratulations!
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Old 29th October 2005, 11:21 AM   #10
sagarverma is offline sagarverma  India
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amp done!!!

smps 90%.the transformer is not givimg symmetrical o/p.
will complete it by tonight for sure.

u must have benifitted from the link i posted.it has everything including the pcb layout and a proven design[me of course :-)].
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