Found in a 70’s documentation, this circuit can operate with signals up to 10 MHz. The operational can be a modern equivalent.
Found in a 90s Popular Electronics, this circuit can power a miniature railroad with voltages of 15...
ON Semiconductor Phototransistor Output Optocouplers Available from Mouser Electronics is the...
This circuit supplies a voltage of 110 V from car battery with 110 V x 100 W output. Transformer...