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25W Mosfet audio amplifier


bane84

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I don't think author would give me the PCB design,
because he sell it in kit.

Anyway I startet schematics in Protel and very shortly I will have PCB.
I was hopping that someone on this forum have it allready.
Thanx anyway! :)

P.S. How can I get lower range of frequency on this amp?
It says it will play from 30-20,000Hz. Can I make it from 20-20,000Hz?

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P.S. How can I get lower range of frequency on this amp?
It says it will play from 30-20,000Hz. Can I make it from 20-20,000Hz?

Coupling capacitors cut low frequencies:
1) The 470nF value of C1 causes the output to be -3dB (half power) at 7.2Hz. If it is replaced by a 1uF film cap, the output will be -3dB at 3.4Hz and about -1dB at about 17Hz.
2) The 100uF value of C7 is fine. It causes the output to be -3dB at 3.4Hz.
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