SCR Complete alarm (CB20474E)

This circuit is from a Popular Electronics from 1992. It uses two SCRs and can be triggered by sensors in series and in parallel.

ADL3225V Power Inductor (COM112E)
September 2016 - It can be obtained from Mouser Electronics the new inductors for power supply of...
PC capacitance meter CB20545E (CB20545E)
The circuit presented is an interface or shield for capacitance measurement as a PC. We found it...
Crystal Probe (CB6190E)
We found this circuit in an old Radio Electronics. The transistors can be the BC548. The circuit...