We found this ladder-shaped signal generator circuit in Radio Electronics magazine from August 1966. The circuit uses a unijunction transistor as its base.
Placed near a telegraphic transmitter (CW) and with a small antenna or pickup, it reproduces the...
The LM387 integrated circuit used in this project is not very easy to obtain. The circuit, from an...
The recommended distance between the emitter and the sensor of this coupler is 15 mm. The circuit is...