This circuit with a maximum current of 50 mA was found in the August 1998 issue of Electronics Now magazine. The integrated circuit used is not very common today.
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...