This circuit was found in Motorola's 1968 documentation. The SCRs are then replaceable with current equivalents. The lamp is 24 V according to the power supply.
This circuit was found in a 1987 edition of the United States' Hands On Electronics magazine. The...
The circuit presented is quite simple, employing tone modulation of the signal. To receive the...
This circuit was obtained in an old American documentation. The integrated circuit used is...