The time of this timer depends on C1. The circuit was found in the July 1994 Electronics Now magazine. The supply voltage depends on the relay and can go up to 12 V.
This circuit was obtained from a 1966 General Electric manual. The circuit applies only to...
This Vienna bridge multi-band oscillator circuit was found in a 1974 Ferranti transistor manual. The...
This circuit is intended for communications receivers. We can find it in a documentation from the...