This circuit is from Mullard 1969 documentation. The circuit operates at a relatively high supply voltage and has a 10 Vpp output. The transistors are of the time, but admit equivalents.
Originally this circuit was indicated for a system of rocket fire by remote control using an FM...
This is an amplifier that uses a pickup coil placed next to the telephone set and the listening is done in...
The purpose of this circuit is to detect the movement of a person by the changes in light that...