How to wiring the transformer
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 22nd January 2009, 03:15 AM #1 diyAudio Member   Join Date: Apr 2006 Location: Taipei How to wiring the transformer Dear sir, Please kindly help me to check the wiring of this transformer Thanks!
 22nd January 2009, 05:26 AM #2 diyAudio Member   Join Date: Dec 2006 Location: Kuala Lumpur The turn ratio will give you the answer. 40:4:1 x2 = 80:8:2 x3 = 120:12:3 ... x6 = 240:24:6 So, if your input Voltage is 120Vac (connected to pin 1&2) then you will get 12Vac on pin 4&5, and 3Vac at pin 6&7 If your input Vac is 240Vac(connect pin 1&2) and then you will get 24Vac on pin 4&5, and 6Vac at pin 6&7 If you use Pin1&3 turn ratio should be 185:4:2
 22nd January 2009, 08:40 AM #3 diyAudio Member   Join Date: Apr 2006 Location: Taipei but, 6&7 is short, how can I measre the level from 6&7?
 22nd January 2009, 12:57 PM #4 diyAudio Member   Join Date: Dec 2006 Location: Kuala Lumpur Basically all set of winding are shorted, but when you measure it with DMM it will create a resistance. But pin 6&7 winding is too little compare with 4&5 or 123, so the created resistance is very low, your multimeter may assume that it is shorted.
 22nd January 2009, 01:01 PM #5 diyAudio Member   Join Date: Dec 2006 Location: Kuala Lumpur Sorry,..A little bit correction here If you use Pin1&3 turn ratio should be 185:4:1
 22nd January 2009, 04:07 PM #6 diyAudio Member   Join Date: Nov 2004 Location: Québec, Québec How do you get that 185 number between pin 1 and 3 ? __________________ DIYaudio for President !
 23rd January 2009, 12:28 AM #7 diyAudio Member   Join Date: Dec 2006 Location: Kuala Lumpur From the picture; The ratio is 40:4:1 40 is for pin 1&2, 4 is for pin 4&5 and 1 is for pin6&7 At the working voltages Pin1&2 is 78v, Pin 1,2&3 is 370v. Because of some winding resistance the voltage will drop a bit from 80v to 78v. So, the ratio is (78:7.8:2 ) / 2 = 39:3.9:1 This is almost same as the given ratio 40:4:1 If you connect to pin 1&3, it will become 370v:7.8:2. After divided by 2 = 185:3.9:1 To make it easier to read, It will be 185:4:1
 2nd February 2009, 05:07 AM #8 diyAudio Member   Join Date: Nov 2004 Location: Québec, Québec Thank you very much for your good explanation, I was curious. It seemed simple, but couldn't find how to get it. __________________ DIYaudio for President !

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