We found this circuit in a Popular Electronics from the 90s. It operates at a frequency of 15 kHz. Components can be difficult to obtain, such as the integrated circuit.
This circuit for the 1750 m band was published in the September 1989 Radio Electronics magazine. The...
The purpose of this circuit is to disconnect the battery in case of an excessive charge current,...
This circuit was originally designed to operate with the alarm CIR12065 which has a tone output. It...