This circuit is part of an article published in the March 1990 issue of Radio Electronics magazine. The sensor consists of a grid-shaped electrode shown in the figure.
This VCO or Voltage Controlled Oscillator uses common components. TR1 can be a BF245 and TR2 a...
This circuit was found in a 1967 RCA publication. The circuit uses components from that time, and...
Here is a very simple and economical electronic game. Using only one integrated circuit and one...