The circuit was designed to work with an audio power amplifier which operated off +18v-0v-18v power rails. The actual voltage used is not too critical except that the feedback is referred to the LED chain which itself is anchored to a +12v rail, hence the separate stabilizer for this.
Authored by
at
, Added: 9 Aug 2007
http://www.4qdtec.com/avu.html
