We found this circuit in a 1985 documentation. The transformer is an old TV flyback that has an exposed part of the core, where 10 to 20 turns of common wire are wrapped.
This mixer configuration with the 741 operational amplifier can be found on several other circuits in...
Touching the sensor with your fingers, this circuit produces a machine gun sound. The circuit must...
This 13.8 V power supply with 10 A was found in a 1997 documentation. It is intended for the...