Operating at just 1.35 V this circuit was found in a 1969 Electronic Design. The circuit makes use of transistors of the time but can be implemented with current equivalents.
This circuit can be found elsewhere on this site as part of alarms or sirens. The circuit given is...
This 3-digit code switch was obtained from an old American documentation. The capacitor is 470 uF...
Found in a 1967 Electronic Design, this circuit changes the phase of a signal in 8 different ways, given...