Class A amplifier
Inducktion, Mon Sept 26 2011, 10:07PMI 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!
Re: Class A amplifier
Dalus, Mon Sept 26 2011, 10:59PM
Is it a amplifier? You know it has a sub 1 gain
Dalus, Mon Sept 26 2011, 10:59PM
Is it a amplifier? You know it has a sub 1 gain
Re: Class A amplifier
haxor5354, Mon Sept 26 2011, 11:27PM
does it respond to a 1Hz input signal?
haxor5354, Mon Sept 26 2011, 11:27PM
does it respond to a 1Hz input signal?
Re: Class A amplifier
101111, Tue Sept 27 2011, 06:53AM
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.
101111, Tue Sept 27 2011, 06:53AM
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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