Once you've reverse-engineered the coil arrangement, you'll need to determine the turns ratio between each set of coils. The "secondary" side may be a single coil with multiple taps, or it may have multiple outputs more like the above example. You should be prepared for the transformer to be as complex as this: Once you have mapped continuity, check resistance between the same leads. Start with a low range DMM, and check for continuity between different leads on each side of the transformer. The transformer you describe likely has multiple taps on the "primary" side, may have multiple windings on the "primary" side and likely has multiple windings on the secondary side. Since transformers by their nature are bi-directional, the selection of the primary side totally depends on your input voltage and desired output voltage. It is a big hefty transformer weighing two or three pounds? (I'm bad at estimating weight) The outside of the transformer says t52-131 on the first line and C-AS-QD7 on the second. Does this make sense? I'd like to know a little better before designing a circuit around it.Īny advice or thoughts will be very much appreciated!!!Įdit: Really important detail I missed. This is the best combination I have found so far. After doing a similar thing to the 'other side' I found that the white and grey produce approx 80Vp2p, 40Vp2p and 10Vp2p. I tried a few more wires on that side and had the same result. it was on for less than a second and never was remotely hot. This stepped the voltage WAY up (200Vp2p was my first measurement) and buzzed a lot. To test I (very quickly) hooked up 120V to the pairs and measured the other wires with my scope. My first thought was that the 'other side' had pairs of wires so it must be the side with the primary.
My experiments to find out what the primary wires are: After reading about how to find out by measuring resistance, I found that the primary wires should be about 4-8ohms I measured all the combinations of wires on each side and applied mains to the transformer. On the 'other side' the wire go as follows: Red, Red, Yellow, Grey, Yellow, Blue, Blue On 'one side' the wires go as follows: White, Yellow, Brown, Orange, Red, Grey, Black
Unfortunately I threw out the amp and didn't write down the number and now I am trying to use the transformer to build an audio amplifier. This is from an old solid state audio amplifier with an AM/FM tuner.
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