High Power Alarm (CB20475E)

We found this circuit in a Popular Electronics from the 90's. The circuit uses three SCRs to trigger the loads.

Instrumentation Amplifier (CB16662E)
This circuit must be powered by a symmetrical source and has a very high input impedance. The...
Crystal receiver with folder (CB8495E)
This circuit uses two diodes in a doubling configuration to receive medium-wave range signals. The...
6V NoBreak (CB17977E)
This circuit serves to prevent devices powered by 6 V from being left with a power cut. The...