1-minute delay (CB21408E)

This circuit with PUT is from a 1967 General Electric manual. The relay must have voltage according to the supply.

Audio Oscillator 555 II (CB16399E)
This traditional circuit with the 555 was found in a 1984 documentation. In this oscillator, the...
Noise Limiter 2 (CB13623E)
This circuit was obtained in a publication for radio amateurs of 1977. It is used to reduce the...
Peak Signal Indicator (CB25966E)
This LED indicator circuit uses an LM339 comparator. The circuit was found in the January 1995...