Using the integrated circuit DCP01051D this circuit was found in the magazine Electronics Now of August 1998. The maximum current is 50 mA.
We can use the circuit shown below, obtained from a 1992 documentation. To turn a low impedance phone...
High-brightness LEDs of various colors and even white can be obtained easily in specialized...
This circuit is from an American publication about old neon lamps. The circuit is leak proof and...