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Success Stories If you have successfully repaired or restored a piece of equipment, why not write up what you did and post details here. Particularly if it was interesting, unusual or challenging. PLEASE DO NOT POST REQUESTS FOR HELP HERE!

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Old 21st Nov 2020, 11:14 am   #1
jonnybear's Avatar
Join Date: Nov 2010
Location: Cullompton, Devon, UK.
Posts: 1,303
Default Ring (LOPT) tester

Back in the days of the CRT I used to spend hours trying to fault find LOPTX so I built a crude tester which saved me hours and replacement costs, then about 15 years ago I built a twin ic one which has served me well and works on all different types of transformer.
During lockdown I was looking for something to do, having been given some Oak and mahogany off cuts, so thought I would make a little box, the next thing I saw on the bench was a sky + display so decided to build a new ring tester, after making the box cutting hole for display and making up circuit I found the sky + display was incompatible as the diodes were reversed so had to compromise with a led bar display filling hole with filler, it all turned out well in the end costing just a couple of pounds and surplus components.
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Last edited by Cobaltblue; 21st Nov 2020 at 11:20 am. Reason: help understand what kind of ring
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Old 21st Nov 2020, 5:54 pm   #2
Join Date: Aug 2006
Location: Stoke-on-Trent, Staffordshire, UK.
Posts: 769
Default Re: Ring (LOPT) tester

Love it but please explain how it works and a schematic
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Old 21st Nov 2020, 10:36 pm   #3
Cobaltblue's Avatar
Join Date: Dec 2010
Location: Exeter and Poole, UK.
Posts: 4,143
Default Re: Ring (LOPT) tester

Originally Posted by Trevor View Post
Love it but please explain how it works and a schematic
Nice explanation and circuit here.

If you want to discuss this further I suggest a new thread.


Mike T
Don't care if it was a bargain why's it in my kitchen
Mike T BVWS member.
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