This simple two-transistor FM transmitter was found in the November 1991 issue of Radio Electronics magazine. The circuit has a 2 + 2 turn coil of 28-gauge wire with a diameter of 1 cm.
This circuit, found in a 1991 documentation, doubles the frequency of a TTL signal. The maximum...
This 4-20 mA current interface was found on a 90's EDN. The components used are not common today and...
This different power control circuit with SCR was obtained from a 1967 magazine. The SCR can be...