This 1970s RCA circuit can be triggered by light or dark, depending on how the LDR is connected. The controlled load depends on the triac.
This is the typical audio amplifier for a 1967 television. We found it in a magazine from the...
This alarm is designed for doors and windows, but nothing prevents it from being used in cars,...
With a unijunction transistor and a tunnel diode it is possible to obtain rise times of 1 ns with...