This static switch circuit appears elsewhere on this site from other sources. This was obtained from a Motorola documentation for 1968 power circuits. The Triac can be another according to the load.
The instrument of this field strength meter, from a 1970s publication, can be a 200 uA...
This simple calibration circuit consists of a crystal oscillator that generates an accurate 100 kHz...
June 2017 - The new touch switches C & K KXT series can now be obtained from Mouser Electronics. These...