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.
We found this circuit in an English magazine from 1980. The circuit can be easily assembled even...
This circuit was obtained in a 1976 English magazine, and can be assembled with equivalent...
The sensor for this alarm is an LDR and it consists of an oscillator that goes into action when...