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Simple 30W MOSFET Audio Power Amplifier by IRF530 and IRF9530

This efficient MOSFET power audio amplifier based on IRF530, IRF9530 HEXFETs and BC550C NPN transistor provides about 18W into 8 Ω speakers and up to 30W into 4 Ω speakers with a total harmonic distortion (THD) of less than 0,08% at 1 kHz. This performance is gained by using only some resistors and capacitors except the transistors. So this is a really easy to build MOSFET amplifier.

You must build two of them to use the amplifier in stereo mode.

After assembling the parts, a list of instructions to follow are given in the original circuit page

The circuit requires regulated 40V power supply. The implementation of such a single rail DC power supply and a preamplifier stage are also given in the project page.


Tags: 30W, mosfet, audio, power,

Comments on this post:

By FPJ -1Score: 

5 years ago:  The total harmonic distortion percentage is a bit high. Can we reduce more of it? What components should I add to provide less THD? Because othe power amplifiers have 0.001% or 0.002% THD on their designs...

By mark cardona 0Score: 

5 years ago:  yeah you are right! it would be better to reduce the THD for more good results :)

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