The two circuits shown show how to obtain an SSB / CW control for receiving this signal top at a common receiver. The circuits were found in an old American manual from the 80's.
In this oscillator a phase shift network formed by C1, C2, C3 and R1, R3, R4 determine the fase...
This is one of many zero crossing detector that can be found in this section. It was found in...
This car alarm was found in an American '80s documentation. The circuit automatically activates...