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 simple reducer can supply devices that require currents up to 1 A. The power transistor must be...
This simple solar powered MW receiver was obtained from a 1974 Popular Electronics. The transistor can...
When a pulse of light reaches the sensor [a CDs cell or LDR] the flip-flop changes its state....