Even though the transformer here says 50:10, with the active resistance dropping the voltage the ratio becomes 54:1ĥ. You just divide the primary voltage to the secondary. Now that we know the voltages of both the sides of the unknown transformer we can calculate its winding ratio. ⚠ Be careful because if you reverse the primary with the secondary you may end up stepping up the voltage to even above mains, which is lethal. You connect the primary of the unknown transformer to the 16Vrms side of the known transformer and measure the voltage at the secondary of the unknown transformer. Whichever has a higher resistance is the primary (that may not always apply but it's the case with step down transformers)ģ. You measure the active DC resistance of the coils of the unknown transformer using an ohmmeter. So first you take a known transformer and step down the mains to a more controllable level. Moreover it could be an audio transformer which may burn it. It's not wise to directly supply an unknown transformer with 220V because you may not know which the primary is and which the secondary is. Here are the steps i use to determine the transformer's parameters.ġ. Usually the rule applies!!!įirstly I'd like to note that very often i find a transformer with no indication at all of what its parameters are. In this example every value should be read as an RMS value even though it's the Peak value, for simplicity.
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