This circuit also appears elsewhere on this site, obtained from other sources. This is an 80's American schematic book. Instead the lamp can be used white high-brightness LEDs.
This calibrated circuit was found in documentation from the 1980s. It makes use of an integrated circuit...
This triac synchronized circuit was found in the July 1995 issue of Electronics Now magazine. The...
This high input impedance circuit makes use of two operational ones that are still common. The...