This circuit is from an American documentation from the 90s. The transistors are of power and must be equipped with good heat sinks as well as the integrated voltage regulator.
The presented circuit uses an uncommon operational amplifier but can be implemented with a more...
The circuit presented was suggested by Texas Instruments in an opto-electronics manual. The...
This sensitive circuit has a homemade reed relay. Approximately 100 turns of fine wire (AWG 32,...