Found in an English documentation, this circuit serves as a receiver for modulated sources of ultrasound. The sensor is a ceramic capsule. Transistors are general purpose types.
This circuit consists of a small inverter that can generate a few hundred volts of DC voltage...
The use of a detector bridge instead of a single diode, as is normally done in common galena...
The LM150, 250 and 350 series of 3 A are manufactured by several semiconductor industries that...