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Chip Amps Amplifiers based on integrated circuits

Chip Amp For computer speakers
Chip Amp For computer speakers
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Old 14th May 2020, 02:36 AM   #1
701c is offline 701c  United States
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Default Chip Amp For computer speakers

I am looking to build an amplifier for a pair of Fostex BK-40h fullrange desktop speakers. Initially, I was just going to buy a dayton DTA-1 but that's boring.
I am considering building the non-inverting gainclone described here on some perfboard as it is very simple and does not seem to require a lot of heat dissipation. Are there any other amp designs or gainclone variations that I should consider?
Thanks.
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Old 14th May 2020, 10:07 AM   #2
sgrossklass is offline sgrossklass  Germany
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An LM1876 (or LM4766) would seem more than sufficient for a pair of speakers rated 6 W with a following wind. I'd look for a good, proven layout for one of these or another similar IC. Layout is highly critical in power amplifiers. Even a job geared more towards car audio may well get the job done, assuming noise isn't too excessive... we are talking 8 ohm speakers rated 78 dB / W / m, so not the very most sensitive either. Should be better than a TDA2822(M), but I imagine that 300 ÁV of output noise should be tolerable.
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Old 14th May 2020, 12:01 PM   #3
anti is offline anti  Slovakia
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You could also use TDA1517 or TI's TPA1517 running at just slightly below max. rated supply voltage. These chips are extremely easy to implement.

Another easy amp is a TDA2616; but you would implement it at a lower supply voltage of cca +/-10V to +/-12V to bring the output down to your speakers' power handling ability.
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Old 14th May 2020, 02:38 PM   #4
mjf is offline mjf  Austria
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tda2030, tda2050........same 5 pin layout as lm1875 -
and cheap......
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Old 14th May 2020, 07:04 PM   #5
farley is offline farley  United States
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The TDA7266 or the TDA7297 are simple to implement and either will work well for a computer sound card amplifier and will run from a simple (suitably sized) wall wart power supply.
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Old 14th May 2020, 07:18 PM   #6
bullittstang is online now bullittstang  United States
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Chip Amp For computer speakers
hard not to recommend one of these for $4. A TDA7293 mono board and a simple 12-18V (center-tap) transformer, you are up and running. Super simple, and sounds pretty good (running a pair in my garage currently at 24Vac).

TDA7293 AC12V-32V 100W l Audio Amplifier Mono Single Channel Board | eBay
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Old 14th May 2020, 07:22 PM   #7
JMFahey is online now JMFahey  Argentina
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Quote:
Originally Posted by mjf View Post
tda2030, tda2050........same 5 pin layout as lm1875 -
and cheap......
Your suggestion is well meant but dated.
TDA2050 has disappeared from the market for years.
TDA2030 is nominally available but only second source suppliers.
Both are widely available as FAKES of course.

LM1875 is alive, well, and available from original manufcturer.
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