Search found 2 matches

by lukebarber
Mon Feb 06, 2017 2:05 pm
Forum: Pro Audio Design
Topic: Help identify Varistor
Replies: 1
Views: 6689

Help identify Varistor

I'm trying to understand how some old equipment from ABB is working. I have schematics for the circuit boards, but it do not contains any information about the parts. Can you please help me identify these varistors? The photo is attached. This is off of an OLD VFD. http://www.clrwtr.com/PDF/ABB-Driv...
by lukebarber
Wed Nov 02, 2016 5:47 pm
Forum: Pro Audio Design
Topic: Grounding on Ward Beck M441 and M402?
Replies: 2
Views: 9175

Grounding on Ward Beck M441 and M402?

Hi folks, new poster here. I'm in the process of racking up a set of these, and have a question about grounding. how do you think I should wire the input/output grounds? should I tie them both off to the ground pin, lift the output ground, or tie one or the other to mains earth pin? I am using a the...