This circuit was found in documentation from the 1980s. It is powered by the audio signal that must be cut. Transformers are the critical components and transistors are 2N2222.
This circuit split the voltage of a Power supply allowing it to be used as dual supply. The limit...
This modem circuit using a 4046 PLL was found in the October 1994 issue of Electronics Now. The...
This simple circuit presents a voltage gain of about 1,500. The input impedance is high and the...