This circuit was found in a 1966’s American publication. What it does is to receive a pulse and keep it for intervals of up to 1 minute at the output.
This circuit has a logarithmic response as a function of the light falling on the sensor. The...
This circuit was found in documentation from the 70s. The transistors are from that time, but the...
The idea is simple: using a flashlight to cut your TV commercials triggers a relay that turns off...