With a 120 ohms resistor this circuit can also be used as a shield for 3.3 V output voltages. The circuit uses an opto-diac enabling the control of triacs connected to the power grid with total isolation.
Found in European documentation from the 1980s, this circuit was originally designed for computer...
This circuit, from a 303 Circuits from the 90s, uses a telephone pickup coil as a sensor to...
This circuit allows to increase the output power of a 741 as an amplifier. The circuit is from a...