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Old 2nd September 2011, 08:17 PM   #1
SirByrd is offline SirByrd  United States
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Default Homebuilt variac

Here is my latest project, took 2 days to build and finish.
Unit has a 10 amp variac but I won't be using it for more than 6 amps.
This is just a teaser photo, I'll take some better ones today.
Click the image to open in full size.
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Old 2nd September 2011, 08:29 PM   #2
kevinkr is offline kevinkr  United States
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Consider replacing the decora style outlet with a ground fault interrupter (GFI/GFCI) for a little bit of additional safety. Looks very nice..
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Old 2nd September 2011, 08:30 PM   #3
SirByrd is offline SirByrd  United States
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I'll see if I can find one of the same shape laying around.
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Old 2nd September 2011, 08:49 PM   #4
kevinkr is offline kevinkr  United States
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Quote:
Originally Posted by SirByrd View Post
I'll see if I can find one of the same shape laying around.
Definitely worthwhile, my whole bench is protected by a GFI and there have been a couple of occasions where I was glad it was there.
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Old 2nd September 2011, 08:49 PM   #5
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Try getting a small audio transformer that you can pass the hot wire to the outlet between the coil and the core. Put a resistor on the output and connect it to a BNC connector that way you can look at the waveform of the current draw!
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Old 2nd September 2011, 10:16 PM   #6
SirByrd is offline SirByrd  United States
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I don't have a scope yet, that is next!
Here are some better photos:
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.
Click the image to open in full size.Click the image to open in full size.
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Old 3rd September 2011, 12:00 AM   #7
Enzo is offline Enzo  United States
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Like new shoes, just wait until you get your first scratch on it....


Looks good and a very useful piece of equipment it will be.
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Old 6th September 2011, 03:19 AM   #8
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Quote:
Originally Posted by simon7000 View Post
Try getting a small audio transformer that you can pass the hot wire to the outlet between the coil and the core. Put a resistor on the output and connect it to a BNC connector that way you can look at the waveform of the current draw!
Along the lines of simon7000's idea, you can get current sampling transformers for just this purpose. I have some in my basement that I removed from scrapped equipment from work. Not sure how many are down there, but I may have some extra.

Peace,

Dave
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Old 6th September 2011, 03:22 AM   #9
Pano is offline Pano  United States
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Very nice. Don't think I've ever seen such a fancy variac. I like the two ammeters.
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Old 6th September 2011, 04:18 AM   #10
SirByrd is offline SirByrd  United States
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I'll ask around locally for current sampling transformers.
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