Saturday, November 6, 2010

Make Your Own Ring Tester

In this post I will share with you all the info you will need to make a homemade ring tester also called a FBT/LOPT tester, note FBT= Fly Back Transformer, LOPT= Line Output Transformer.
Although originally designed to test flyback transformers this tool is used more often today for checking the primary coil of SMPS transformers for shorted windings and also the primary and secondary windings of high voltage transformers found in inverter circuits along with many other high Q inductive components and of course I still check the occasional flyback which itself is a high voltage switching transformer.

Click here for the assembly manual for the original dick smith ring tester which is no longer in production. This manual includes a schematic and a parts list.
Below are some pictures of the beautiful ring tester my good friend Behzad made using the schematic and parts list from the included assembly manual.

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