This circuit of a few watts of power shows a typical configuration from the 70s using driver and output transformers. Output transistors must use a heatsink.
When the sensor X1 is opened, the relay is energized. When waiting, the current drained is very...
Based on the LF256 operational amplifier, this circuit was found in the September 1989 issue of...
This circuit was found in a 1968’s Motorola documentation. The transistor is from that time. The...