Found in a 90s Popular Electronics, this sensor operates by infrared reflection. The components are modern, and the phototransistor can be of almost any type.
The circuit is from an 80's publication, but the components are current, only special type diodes...
The maximum current of this power supply is 2 A and the output voltage can be set between 6 and 24 V. The...
This is a circuit of the 80's ON Semiconductor thyristor manual. Of course, the configuration can be...