This circuit was found in a 1966 General Electric book. The triac and the day are from that time and can be replaced by modern equivalents depending on the load.
This circuit will trigger a buzzer with an oscillator if the ignition key is removed with the...
This TTL generator that can function as a control shield or external clock for microcontrollers was found in...
This circuit generates signals of various frequencies and waveforms, making it useful on the...