Hello friends,
I stumbled over the design of an intercom these days. There is a circuit at the input of the amplifier consisting of a transistor, three resistors and five capacitors (three of them electrolytic).
I simulated the circuit with a function generator at its input. At high "volume" nothing changes. If the volume is reduced drastically there is no voltage at the output capacitor. After a while it increases continuously to the same level as before.
Can somebody shed some light on the functions? Also the waveform changes considerably, from sine to something similar to a square wave.
Regards
Hans