I made a simple little transistor amplifier using the 2N3904 (basic class A amplifier):
\begin{align*} R_1 &= 2.2\, k\Omega \\ R_2 &= 1\, k\Omega \\ R_L &= 22\, \Omega \\ R_E &= \text{potentiometer} \\ C_1 &= 2.2\, \mu F \\ C_2 &= 20\, \mu F \end{align*}
It works fine, but if I leave it on for a little too long it gets really hot.
I have 2 different types of transistors that I can mount to a heatsink. TIP31A and TIP41C. But when I put them in they don't work. Could someone explain why they don't?
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