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Old 17th March 2013, 11:37 AM   #1
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Default cables on my transformer hifi

hello i found an old hifi tranformer from amp.....the name of trans is AM-TS-780 NTK......i don't find something in web for this product....so i need your helps....the tranformer have 3 wires from one side and 4 wires from other side...the 3 wires is 1) black 2) 114 volt 3) 220 volt.....but the other wires i don't know...are 2 blue wires and 2 red........if i learn what are the wires, maybe make something from this tranformer......help me!!!
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Old 19th March 2013, 12:57 PM   #2
yai is offline yai  Germany
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I don't know if i should tell you this - please don't kill yourself!
A foto would help, together with your measured resistances between all the wires (between red-114v, black-220v, between the two blue wires, the two red wires, both pairs of blue-red wires). The ratio of the resistance of black-220v : black-114v should be 2:1, roughly. The ratio of resistances in : out should lead you to a good estimation of output voltages you have to suspect.
Then I would connect the black wire and 220V to mains (here in europe!) and measure the output voltages on the other side.
HTH, and don't grill yourself or others,
yai.

Last edited by yai; 19th March 2013 at 12:58 PM. Reason: removed those smilies :-)
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Old 19th March 2013, 02:04 PM   #3
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Then I would connect the black wire and 220V to mains (here in europe!) and measure the output voltages on the other side.
I'd start by connecting the primary to a sine generator (say 10 Vrms). The secondary output should be enough to measure with a DMM.

Samuel
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Old 19th March 2013, 06:07 PM   #4
yai is offline yai  Germany
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yes, you're right, samuel. And if he has no sine generator, he can take another transformer with e.g. 24v output (in europe, again) as input, and multiply the output voltages by 10.
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