This fuzz effect for guitars was found in an American 1980s documentation. The transistors may be the BC549 and should be battery powered for noise sensitivity. Diodes are commonly used.
The two circuits shown show how to obtain an SSB / CW control for receiving this signal top at a...
Thes astable was found in old publication of 1968. The circuit uses general purpose germanium...
This control panel allows the use of NO and NC sensors, turning the alarm on after 30 seconds...