This timer, like the previous circuits, uses a currently uncommon integrated circuit. The time is given by capacitor C1 and R2 which has the range of values indicated in the diagram.
This circuit uses a loop antenna to receive and amplify signals from the 60 kHz long wave band....
This circuit was obtained from a 1967 magazine. The magazine no longer exists, but the circuit can still...
This two-transistor preamplifier was found in a 1960 Sylvania transistor manual. The output...