This circuit uses CMOS integrated circuits and can operate with CMOS logic from 3 to 15 V or TTL with 5 V power. The power is obtained from the circuit under analysis.
This small crystal microphone transmitter was indicated in an 80s spy book. The range depends on...
This interesting circuit, found in a 1984 documentation, captures stations in the FM band and...
Of course, with a change in the cable length, the frequency can be changed as long as it is within...