This circuit uses an optical coupler called Raystor created by Raytheon in the 1960s. The circuit uses components from the era that can be changed. The current is low.
We found this circuit in a 1989 publication. Its purpose is to produce noise in the VHF or UHF...
This short-range, medium-wave transmitter was found in a 1966 documentation. The transistors are...
This is the receiver circuit for the PFM (pulse rate modulation) transmitter of the previous...