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Old 27th July 2010, 04:01 PM   #1
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Default Transformer Bobbin Turns Counter

Does anybody have any suggestions for buying a commercial Turns Counter (to 5 digits) or how to build one myself? Thanks for your responses.
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Old 27th July 2010, 07:32 PM   #2
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How permanent a unit do you want? Or is it for one use?

You can buy turns counting dials. Try MFJ in Mississippi for starters.

You can set up a rotating magnet/coil assembly with an electronic counter.
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Old 27th July 2010, 08:31 PM   #3
jlsem is offline jlsem  United States
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The easiest and cheapest way is to rig a mechanical plunger that keys the = button of a cheap calculator after you've entered 1+1. I personally use a Veeder-Root mechanical counter actuated by a cam on the rotating shaft. For extra fanciness I added a small ball bearing to the lever on the counter.

http://cgi.ebay.com/SALE-VEEDER-ROOT...#ht_500wt_1154

John

Last edited by jlsem; 27th July 2010 at 08:33 PM.
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Old 27th July 2010, 10:09 PM   #4
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I use an ICM7217 chip & 7-seg display to wind transformers on my lathe. It took a bit of soldering to put it all together on strip board.
The trigger can be a reed switch actuated by a tiny magnet on the chuck.

The caclulator trick is much quicker! You could again solder a reed switch across the necessary keypad contacts.
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Old 31st July 2010, 08:43 PM   #5
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Speakerman: Please do not double-post! E
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Old 1st August 2010, 02:36 AM   #6
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Sorry, Mickeymoose/E. I am relatively new to blogging and did not mean to do inappropritate entries. I wanted to reach as many people as possible in different categories; I assume that is what you mean by "double-posting". Will not do so again. Thank you for the heads-up.

Thank you to those who have responded with advise, it is greatly appreciated. I will check your suggestions out.
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Old 13th August 2010, 03:50 AM   #7
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Hi, Guys -

Found a great site by Gerry Walterscheid Jr., check it out:
The Engineer's Notebook: Universal Coil Winder

I am going to attempt a motorized version.
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