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Old 12th February 2016, 10:04 AM
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Shane Shane is offline
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Join Date: Jan 2006
Location: Glorious Devon
Posts: 1,461
Default Re: Kat 6550 build (yes really!)

A transformer is effectively just two long bits of wire wrapped around a lump of iron. The symbol on the circuit diagram is a pretty good representation. Bearing that in mind, you can see that since cl15 and cl18 are connected to opposite ends of one of those wires (the secondary winding), your circuit tester sees a short circuit, because it works by passing a DC current between the probes. At DC the transformer windings act just like bits of wire. It's only with AC that the clever stuff starts to happen.

Last edited by Shane; 12th February 2016 at 02:57 PM.
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