Found in an Electronic Design and 1970s, this circuit uses transistors of the time. The transistors can be replaced with equivalents and the relay is 12 V depending on the power supply.
The circuit shown timing the drive of a motor using an optical coupler. The diode bridge can be...
This circuit with power MOSFETs was found in a 1980s Siliconix documentation. Equivalent MOSFETs...
June 2017 - The new touch switches C & K KXT series can now be obtained from Mouser Electronics. These...