Based on Radio Shack 276-137, this circuit was found in the December 1995 issue of Electronics Now magazine. The circuit drives an LED but could use a relay instead.
This circuit can be used as a shield for microcontrollers. The circuit is from American...
May 2017 - Mouser Electronics announces the availability of the new Murata SCA3300-D01 3-axis...
This circuit generates signals for adjustments in FIs of 10.7 MHz. The transistors can be BC548 or...