We found this circuit in an Australian publication from 1991. It is a kit of the time with input for a guitar pickup. The range is a few tens of meters.
This configuration (using a logic gate with TTL compatible output) uses an amplifier transistor to obtain...
Placed near a common receiver, this oscillator is intended to generate a beating signal to receive...
Published in the September 1973 issue of Radio Electronics magazine, this diagram may be useful to...