Suggested by Radio Electronics from the 90s, this circuit activates a buzzer and an LED when the indicator is activated.
September 2017 - Arduino Lucky Shield shields containing a 5 V OMRON-g6RL relay, a Everylight...
This circuit is from an 80's documentation. The circuit makes use of a component of the era, the...
This low power audio amplifier was found at 1992s Popular Electronics. Transistors are general...