This circuit is from a 1967 RCA publication. The components are of the time, admitting equivalents, including the SCR that determines the maximum power of the load.
Operated directly from the power grid, this detector was found in an 80's RCA documentation. The sensor is...
This circuit is from a 1964 Electronic Design. The sensor is an LDR and the transistors are...
The purpose of this circuit is to 'produce a beam of infrared rays modulated at a frequency that...