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Registered Member #3637
Joined: Fri Jan 21 2011, 11:07PM
Location: Buffalo, NY
Posts: 1068
I found a simple class A amplifier schematic on the internet, and built it on a breadboard.
I did modify the circuit a little bit. Instead of using the mosfet shown, I beefed it up a bit, and used a 28N50F mosfet, and a pretty decent sized heatsink.
I also removed the 22 - 100 ohm resistor on the top part, and changed the 1 meg ohm resistor to a 10k ohm resistor. I also increased the audio capacitor (the .1 uF one) to .27 uF for more bass.
It works great, surprisingly enough. Gets rather warm, but that's what class A amplifiers are supposed to do!
Registered Member #575
Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263
For further modifications I would take a LM317 in a CCS configuration and use it instead of R2. It will work as am excellent dynamic resistance and it will get allot easier to distribute heat with a TO220 package. It is also a cheap solution.
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Class A amplifier
