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Should you not be able to measure the resistance between the 2 contacts on the primary coil and the 2 contracts on the secondary coil?
The ratio of resistances can be a lot larger than the turns ratio, because the winding with the higher number of turns will usually be made out of thinner wire.Finally, if you are able to measure both, and you know what the ratio of the transformer is supposed to be, the resistances measured should follow the ratio; if they don't, there might be a problem.
OK. 25W into 8 ohms is a voltage of only 14.1V RMS and the input volume cotrol reduces it.The instructions say it is a step up. It's not 200 watt input, it's 200 watt output. in the instructions it states not to exceed 25 watt input.
If there is no full-wave rectifier then the SCRs produce an output power of half of what it could be.Why would you use SCRs in this type of circuit instead of a triac?
I don't have a number for the transformer but it came with this:
120VAC 3 Channel Color Organ Kit-The Electronic Goldmine
Here is a drawing. The greenline and the red line are the terminals that are connected. It seems like a really weird configuation to me.
2nd Question. According the the schematic and instructions that came with it, the low resistance side is connected to the speakers and the high resistance is connected to SCR's.
The resistances I got were 2ohms and 50 ohms. Wouldn't attaching a 2ohm load to a stereo that already has speakers connected cause the stereo to overheat?
Yes. You should expect resistances between ~1Ω and several hundred Ω, depending on voltage and current rating.