This crystal-based circuit can generate accurate 50 or 60 Hz signals. The circuit is from a November 1998 Electronics Now magazine. The output signal consists of rectangular pulses.
We found this circuit in the 1974 Ferranti transistor manual. Transistors are from the time, being...
This temperature sensor circuit was found in an old American documentation. The components used...
This separator filter is from an old publication. The capacitor can have 10 to 47 uF of the...