Suggested by General Electric in a 1967 publication, this circuit uses the D13T1, an uncommon SCR today. This component is triggered by the anode.
September 2017 - Texas Instruments DRV5032 Hall Effect sensors, an ultra-low power digital switch...
The operational amplifier is old. The circuit is from an 80's documentation but can be designed...
A touch in this circuit turns-on the lamp or the relay. Power supply is according the lamp or...