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.
This circuit was found in an ancient American documentation. The transformer is the type used in...
This circuit generates two pulses per cycle of alternating voltage for full wave control. The...
To increase the control capacity of the CA3140, an amplifier circuit can be used, as shown in the...