SCR Motor Speed Control made from salvaged parts

[pfredX1]

Paul Jones, It would be appreciated if you'd share of provide a link for the schemagic for this project.

Just looking at the circuit board I'd say there are better schematics for making SCR phase fired converters today. We have higher performing parts we can use now. I found this circuit works well http://i.imgur.com/GE3ZXqP.png That's all you really need. It can even handle inductive motor loads. I've run a 600W router on one that I made. You can even get a heavier triac for larger loads. Here's the same circuit with a snubber http://i.imgur.com/iiuSn8H.png Though with the right triac you don't really need a snubber.