The maximum current of this circuit is 200mA, and the ripple is only 50 mV. The circuit is suggested by Texas Instruments in its linear applications manual.
This circuit is used for cable checking. We found it in the Radio Electronics magazine of December...
This circuit from a 90s Popular Electronics, decodes the old analog TV signal. It works with a...
This circuit makes use of a sensitive 5 mA reed-relay to be driven directly by a phototransistor. The...