This circuit is from an American documentation from 1975. The circuit uses components of the time which can be replaced by modern equivalents. The coupler is homemade with a lamp and a photocell.
This circuit was found in an American documentation from 1970. We can increase the number of...
This amplifier with the RCA CA3018 integrated circuit was found in the August 1970 issue of Radio...
This three-transistor circuit can control 3 V relays or servos from 17 MHz modulated transmitters. The...