This circuit turns off after a time given by capacitor C1. This component can have from 1 to 1,000 uF depending on the desired time. The circuit is from an Electronics Now from June 1995.
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...