Quote:
Originally Posted by Sean_Goddard
SWEET. Andy the Genius strikes again!
Andy was a very good friend of mine and as you know, sadly passed away a few years back  .
It's good to see his genius still producing the goods  |
Yes, Andy was a great man...
Morgan, you can't found in internet, this was published on Everday with Practical Electronics magazine in the 80s.
Is very simple: you connect the loop-core system I post here instead the transformer in the Andy's schematic. The output you connect to the comparator/timer/tone generator I post here. You put a potentiometer instead the audio preset in Andy's schematic as sensibility control. The bargraph preset you adjust when first led of. Better if this circut is in metalic case, loop must be outside.
For rights of the publishers, I can't post the Andy's schematic.