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.
This circuit can also use other series operational amplifiers such as MC33172, MC33174, MC35171,...
Found in Popular Electronics from the 90s, this circuit mutes a scanner's speaker in the absence of a...
This circuit was found in General Electric documentation from 1965. The transistors are from that...