This circuit is intended to trigger SCRs on the positive half cycle for solenoid control. The circuit is from the 1967 General Electric SCR Manual.
If you have old tube or transistor amplifiers that hum (60 Hz noise) the circuit shown may be the...
The integrated circuit used in this regulator is unusual, as are the transistors. The circuit is...
Other settings like this can be found on this website. This makes use of old operational...