Wanted: 12vdc, 5-8 clean watts chip amp for 8ohm FR computer speakers - diyAudio
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Old 10th April 2013, 12:58 PM   #1
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Default Wanted: 12vdc, 5-8 clean watts chip amp for 8ohm FR computer speakers

This topic has probably been covered here. Any links?

Some simple amp that lets thru lots of details and music.

PS: 12vdc 2-4A wall wart
Chip Amp: 5-8 lowish distortion watts
Class: D, T, AB
Computer Speaker: 8ohm, full range Aurasound NS3-193-8A 3" Fullrange 2 liter box sealed.
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Old 10th April 2013, 01:12 PM   #2
FoMoCo is offline FoMoCo  United States
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You won't get that power into 8 ohms without a bridged amp with a single 12V supply. A pair of LM383/TDA2002 bridged, if they still make those, will work. Also, any IC that is made for automotive head units should be sufficient.
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Old 10th April 2013, 01:52 PM   #3
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tda1557q and its brothers and sisters.
just what you need.
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Old 10th April 2013, 04:05 PM   #4
AndrewT is offline AndrewT  Scotland
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Location: Scottish Borders
a single amplifier running on a 12Vdc supply can output a maximum signal of ~4Vac. A 4Vac signal is 11.3Vpp. That peak to peak voltage must be less than the supply voltage.

4Vac into an 8r0 load is 3^2/8 = 2W
or 4W into 4r0
or 8W into 2r0
or 16W into 1r0

If you bridge any two of these amplifiers you will get double the power into double the impedance.
Choose two 8W into 2r0 amplifiers. As a bridged pair you can get 16W into 4r0.
regards Andrew T.
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Old 10th April 2013, 05:15 PM   #5
sregor is offline sregor  United States
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Lots of bridged amps designed for the car industry. TDA7240A, if you can find it, is simplest. TDA1557Q mentioned earlier is good. As mentioned, must run bridged circuit to get any power. There already was a 12 volt thread - find it and get a lot of ideas. (maybe it should be a sticky, as topic comes up every once in a while....)YMMV
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Old 12th April 2013, 01:12 PM   #6
Mihkus is offline Mihkus  Estonia
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You better build self osc power supply
Super simple and use LM1876 or 2 LM1875 chips clean 10W for sure.
Sounds wonderful too those 12V single supply amps have very high THD im not kiddin mostly below 0,5 but damn that is noisy and the 12V PC supply AND SMPS AND if not fully shielded it will become EXTREMELY NOISY! damn!
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Old 12th April 2013, 02:07 PM   #7
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the drivers in question are tiny 3" ones.
the tda1557q or any of its relatives will be able to power them.

I see no reason to build anything overcomplicated for this task.
I'd bet there will be no need to even utilise half of what those chips are able to do.
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Old 12th April 2013, 02:31 PM   #8
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The TI TPA3112D1 is a single channel class D chip that will make 10 watts into 8 ohms from 12 volts. I plan to put one inside a guitar to feed a 4 inch Faital Pro speaker. It is $3.16 from Digikey.

The TPA3130D2DAP is stereo for $4.03.

I just ordered the TPA3112D2's and some TPA3116D2DAD's (the 3130's big brother) for a guitar enabled boom box. It will run from 22 volt LIPO batteries.
Tubelab, it's 5 year mission. To explore strange new tubes, to seek out new circuits and topologies, to boldly go where no tube has gone before......
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Old 13th April 2013, 08:58 AM   #9
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AN7522 Will work nicely. I find them in old CRT TV sets to run the speakers.

I'm using one for my computer speakers now, using a 12V, 1A transformer-based AC Adaptor and pushing ~4ohms per channel. It is loud and has good Sound Quality!!!
You can call me Mad Professor, building crazy experiments in my Electronics Workshop
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Old 16th April 2013, 05:01 AM   #10
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Thats exactly the sort of thing i want for my sons guitar. I have routed a hole for a speaker, looking to put a 12v amplifier, but with lots of distortion he is only 10. power chords only
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