I tried to build this Class A amplifier circuit as a learning experience:
with the following modifications:
- I have no MPSW45, so I built a Darlington out of a 2N2222 and TIP31A.
- 150k resistors: I only had two 100k resistors in my collection. But as long as they're identical, should work...???
- speaker: I had only a 10W, 4 ohm car speaker readily available.
Powered up with a 6V battery, input was the headphone out from a portable radio. Nothing except for an impressive Thump when I connected power to the circuit.
What could have gone wrong?
I'm not sure if I would have 200mV p-p on the radio headphone out. Would that be it?
Thanks,
Michael