Found in the February 1990 Radio Electronics issue, this sophisticated 100 MHz probe uses a period display module. The circuit has an external power supply.
This circuit is designed to activate an automotive alarm after 8 minutes of activation. Of course...
The coils determine the frequency of this oscillator that we found in the January 1996 issue of...
This simple timer can be used in many applications such as egg timer. The LED glows up when S1 is...