On 26 Jun 2005 13:40:25 -0700, jim rozen
wrote:

In article , jim rozen says...


http://www.metalworking.com/DropBox/Circuit_diagram.jpg

Hmm. Nice phase detector.

What's the 50K pot doing at the last (meter) stage?

Jim

Wide range Zero set (about 3x full scale) - it performs the same
function as rotating the outer dial on a mechanical dial gauge. Much
more convenient because it does it without mechanically disturbing the
measuring head.

It also backs off the zero offset error of the earlier
stages.

Jim