Are these voltage measurements feasible??

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Chris Wilson
Posts: 2
Joined: Fri Apr 25, 2014 9:04 pm

Are these voltage measurements feasible??

Post by Chris Wilson » Thu Sep 25, 2014 2:16 pm

Maybe I am doing something wrong, or misinterpreting my readings, would someone with more experience please look at this OP AMP circuit and explain my results please? Localised image of the circuit, and full schematic hopefully attached, many thanks. The localised image is from the first page of the full schematic linked to below, IC3 area, AC balance control.

http://www.chriswilson.tv/schematic.pdf
TIG_ac_BALANCE.JPG
TIG_ac_BALANCE.JPG (136.32 KiB) Viewed 2818 times
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Pauldf
Posts: 170
Joined: Mon Jun 10, 2013 7:42 pm

Re: Are these voltage measurements feasible??

Post by Pauldf » Sun Sep 28, 2014 3:56 pm

It looks to me to be a negative feedback circuit, what is it for? I'm thinking it is a welder?
What is the fault? When you switch it from AC to DC do you get a change in voltage at pin 26 on plug 1 ?
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