This circuit from an old MIT documentation excites an oscillograph element, an old waveform viewer.
This circuit is recommended by Texas Instruments in the datasheet of the TL317, equivalent to...
This circuit can be used in alarms, data links or áudio links using IR radiation. The circuit is...
For a maximum current of 50 mA the capacitor must be from 470 nF to 250 V if the grid is 110 V and...