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Old 8th October 2012, 12:12 PM   #1
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Default Looking for simple power amp schematics.

I'm looking for solder by numbers power amp plans either point to point or with simple to etch pcb plans.

Some where in the 200-250W per channel into 8 ohm range.

Easily sourced and cheap components. I'm planning to build 6 channels for outdoor PA, so something reliable please.

SPL is more important than SQ. These are for Subs and mid bass.

Thanks in advance.
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Old 8th October 2012, 01:03 PM   #2
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I attached audio amplifier diagram below.

For more details, read this topic (use google translate):
FET300 - un amplificator audio simplu si performant - DIY & Kituri Electronice - Comunitatea Tehnium Azi
Attached Files
File Type: pdf FET300.pdf (146.0 KB, 274 views)
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Old 8th October 2012, 02:51 PM   #3
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Look at the TI National LME39810 (BJT) and LME39830 (FET) driver IC datasheets. Probably available from TI but I got my datasheets through the local farnell.com website (they stock them). One IC, 2 pass transistors, a circuit breaker, transformer, diode bridge, and two filter caps, 14 other parts, you're done. Some guy on Solid State forum is puffing a PWB kit he is selling for the FET version.
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Last edited by indianajo; 8th October 2012 at 03:07 PM.
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Old 8th October 2012, 03:49 PM   #4
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@indianajo,

I think you mean LME49810 or LME49830 ??? Right?
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Old 8th October 2012, 05:22 PM   #5
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See also https://sites.google.com/site/quasisdiyaudiosite/
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Old 9th October 2012, 11:30 AM   #6
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Thanks guys some nice suggestions there.

@franzm I'm really liking the Nbip300.

How do you think these designs would compare to something like a DX turbo?
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Old 9th October 2012, 03:24 PM   #7
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Don't know DX turbo. I built the Nbip300. As a subwoofer amp it wasn't bad. It is simple and uses parts easy to source or to replace. But it has no protection.
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Old 9th October 2012, 10:06 PM   #8
dangus is offline dangus  Canada
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It's nearly always cheaper to buy second-hand amps than build from scratch. Plus, name-brand amps have protection circuits and resale value.

Power Level - 500VA
Note that just one 500VA toroid power transformer from Plitron is about $160 (plus shipping). Figure on another $100 for a case, $100 for heat sinks, $100 for filter caps. Now a used Peavey CS800 or PV8.5C from the music store looks like a bargain. Check eBay for power amps within pickup distance; if you can avoid shipping, you have an advantage over other potential bidders. Try local sound rental companies; some of them must be replacing their heavy old amps with lightweight class-D amps and selling off the old iron.
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Old 9th October 2012, 11:24 PM   #9
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dangus, I appreciate that in some places used amps are cheap and available, in my place that isn't so.

If I build my own amps in a modular fashion, I have the capability to repair, and also the satisfaction of DIY.

Franzm, which of those amps has a low parts cost and protection?
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Old 4th November 2012, 02:44 AM   #10
nuwan is offline nuwan  Sri Lanka
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Quote:
Originally Posted by donpetru View Post
I attached audio amplifier diagram below.

For more details, read this topic (use google translate):
FET300 - un amplificator audio simplu si performant - DIY & Kituri Electronice - Comunitatea Tehnium Azi
sir i triad to access to site True link you gave us. but i can't download non of the PDF document you attach there. could you help me to get that top & bottom pcb lay out & construction detail in English. i am new to diy sorry for bad English
thanks
nuwan
...................
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