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Return to BlogSimple 30W MOSFET Audio Power Amplifier by IRF530 and IRF9530
Posted Jan 14, 2012 at 9:59 am
Figure 1
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.
Read More:redcircuits.com/Page123.htm
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2 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...
2 years ago: yeah you are right! it would be better to reduce the THD for more good results :)