How Do I Hook Up This Audio Transformer

[icom128]

Hi. Could some one please tell me the correct way to connect this TY-145P transformer. I think the dot in the variable audio level schematic
indicates pin 1 start of primary & polarity. But I am unsure of how the other TY-145P pin numbers should be connected .
Thanks.

 

[audioguru]

Pins 1 and 3 are the input and pins 4 and 6 are the output. The dots indicate in phase. Your schematic shows pins 2 and 5 not connected to anything.

 

[icom128]

Thanks audioguru , I have attached another pic to see if I got the placement for pcb correct. As the datasheet seems to show its pins on the schematic different to the pin spacing drawing 6-5-4 look reversed on what would be board drill hole orientation.
Dont know if this matters for phase , as these things confuse me.

Thank you.

 

[audioguru]

The pins are numbered in a circle. The schematic of the pins shows that pin 1 has the same phase as pin 4.
Does the phase matter? you cannot hear phase unless there is another signal like in stereo.

 

[icom128]

So is my transformer silkscreen placement on the audio level schematic ok .
thanks

 

[audioguru]

You have the output phase reversed from the input phase.

 

[icom128]

Ok thank you for that audioguru.

 

[KeepItSimpleStupid]

Agree, you have to swap 4 and 8 on your superimposed transformer.

 

[Nigel Goodwin]

Agree, you have to swap 4 and 8 on your superimposed transformer.

Not really - just swap the labels on E1 and E2

Assuming there's any need to swap anything?, it's highly unlikely to make the slightest difference - but you could even put a double pole double throw switch on E1 and E2, so you could reverse the phase if ever required (it's fairly common on mixers, but rarely used).

 

[icom128]

Big thanks to all who replied, I will swap them round using one or the other suggested methods.
Can anyone explain how this 1:1 transformer gets the correct input phase on pin 1 & 4.
And an inverted phase if the input on pin 1 is connected to pin 6.
I would like to learn how they wind these to get 2 different phases. Is it simply that the primary is wound in 1 direction
and secondary is wound in the other direction ?.
Also how would someone find out the input start pin 1 - and pin 4 , if a transformer had no dot or pin numbers on them ?.

Thank you.

 

[Nigel Goodwin]

Nothing to explain really, as I mentioned in my previous post it's simply a matter of how you label the pins - I would expect most transformers windings are wound in the same direction?, if you want phase reversal just label the wires accordingly.

 

[icom128]

Thanks I only asked because most audio circuits on the web mention , "make sure you connect your audio + input to the pin near the DOT".
But some transformers don't have the dot mark on them , I have some here not marked.
Could I simply use a multimeter for continuity to find the primary start & end. and secondary start & end ?.
And not worry about phase.

Thanks.

 

[audioguru]

Phase is VERY important if you have stereo or surround sound. If a signal and another similar signal are out of phase then they cancel. If a signal and another similar signal are in phase then they add and produce a total a little more than either one.

A multimeter or testing for continuity does not measure phase.