Found in 1980s Radio Electronics, this circuit triggers the ignition of a rocket after the countdown is completed. The countdown is monitored by the sequential lighting of LEDs
This signal injector circuit, an astable multivibrator, was found in a 1971 magazine. The circuit can...
This circuit that can only be used with simple resistive and inductive loads (never electronic) was...
This circuit activates a relay at dawn. The relay can be used to sound an alarm, turn on a radio...