This circuit, with printed circuit board, is from an article in Radio Electronics magazine from May 1971. The circuit uses the C106 which was already a common component at the time.
The movement of the indicator needle indicates when something or someone approaches the sensor, an...
This circuit was found in an Electronic Design from 1968. Its purpose is to produce synchronized trigger...
Using the CMOS IC 4046 we found this VCO in the November 1984 Radio Electronics magazine. The...