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L12-2   CFP Output amp  120W*2 8R
L12-2   CFP Output amp  120W*2 8R
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Old 16th July 2019, 06:36 PM   #331
Rallyfinnen is offline Rallyfinnen  Sweden
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Join Date: Jan 2017
I saw these L12-2 boards being sold as 30W class a amps..
30W 8Ω Class A Amplifier Board 2-Ch Power Amplifier Class A Amp Board A30-L12 | eBay

Gave me an idea to try +-18VDC supply voltage and bias them high(I have a pair of switched supplies and nice heat sinks). But the question is how well will they work with such a low supply voltage? Will I lose more than I gain? Maybe it has been simulated?

What do you think?

Last edited by Rallyfinnen; 16th July 2019 at 06:39 PM.
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Old 17th July 2019, 01:11 AM   #332
Ian Finch is offline Ian Finch  Australia
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You need a different type of bias controller to run amplifiers in class A reliably. My suggestion is don't try it with this compact board that mounts virtually flat on the heatsink, which will cause some heat problems. Start with a proven class A design if that's what you want when complete, since the really good class AB sound character of this design will not translate to class A operation anyway .
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Old 17th July 2019, 05:43 PM   #333
nilsW is offline nilsW  Sweden
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Just bought a pair of boards to try after reading this thread.

Can someone recommend a good quality power supply for these boards?
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Old 17th July 2019, 07:18 PM   #334
Rallyfinnen is offline Rallyfinnen  Sweden
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Big transformer and big capacitance! I would say minimum 40mF for two channels.

I have been testing them with +-37VDC with two beer can size capacitors (I think over 1F each). The transformer is from a scrapped sony surround receiver, so I'm not sure about the rating. I would say 'medium size'
Anyway, I have not been testing them to clipping, only moderate levels, and then voltage drop on the rails was around 1V.
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