1-minute delay (CB21408E)

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

Small 3-Stage FM Transmitter (CB20405E)
This small transmitter has an RF amplifier stage with coupling made from the central socket of the...
Notch Filter (CB19803E)
This filter configuration was found in an 80's documentation. The circuit has the frequency...
20 W amplifier TDA1520Q (CB16670E)
This powerful amplifier was part of commercial sound circuits from the 90s. The integrated circuit...