This is my first time designing a circuit by myself :)
The input of this circuit is the output jack of my MP3 Player.
The output of this circuit is 4-Ohm loud speaker (sometimes I connect 8-Ohm speaker).
The first stage is the common emitter mode and the second one is common collector mode. I wanted to make a power amplifier.
How to get rid of thermal runaway of a transistor? Actually, The second transistor of the Darlington pair Q2 gets very hot in few seconds.
Is this circuit able to amplify RF signals (especially FM frequency)? If so, where can I connect the cap, coil (tank circuit) and the diode?