Found in the September 1992 issue of Radio Electronics magazine. This circuit generates pulses that are determined by C3. The circuit has output pulse intensity and timing adjusted by R6.
The idea is simple: using a flashlight to cut your TV commercials triggers a relay that turns off...
Found in documentation from the 70s, this circuit uses an operational one from that time. It goes for...
Found in a Popular Electronics from the 90s, this circuit uses thermistors for low noise...