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.

Capacitance Switch (CB4993E)
Although indicated in the original publication of the 1980s as a capacitance switch, the circuit...
Family of Live Updateable Controllers for Digital Power Expanded
The dsPIC33EP128GS808 Digital Signal Controller Family now Offers up to 128 KB of Flash while...
1 MHz XTAL Oscillator using the 7402 (CB787E)
This TTL oscillator can be used as clock in many applications. The output signal is square and the...