This circuit is from an 80's publication. It makes use of small 6 V x 50 mA incandescent lamps. The diodes can be general purpose or even 1N4002. The transformer is 6.3 V with 100 mA or more current.
July 2017 - The new Schottky rectifiers from the FMX series for currentes from 1 to 3 A from...
This TTL dice was found in an old American 1980s documentation, but can still be easily assembled....
This circuit uses an operational amplifier to simulate an inductor. The circuit is from old...