Found in a 90s Popular Electronics, it serves both TTL and CMOS logic. The injector can provide 10 kHz or 100 Hz signals. The circuit drives a transducer and two LEDs.
This highly sensitive circuit causes one relay to be closed when the other is open or still...
This amplifier circuit with a low power MOSFET was found in Popular Electronics from the 90s. The...
A high-frequency square wave oscillator using an LC-tuned circuit is shown here. The upper...