This circuit is from a 1965 Radio Electronics. The triggering transformer generates high voltage pulses. The generated light pulse depends on C1 and C2.
This circuit detects frequency modulated signals that are not received by a photo sensor. The...
In the figure below we have a simple way to perform a function test for a solar cell. The circuit is...
This mini siren, found in a 2003 publication, powers a small piezoelectric transducer, but a...