Transformer Lead question...

[Stitch333]

The transformer in question is an API 2623. I know that red is primary and the blue is secondary, but I can't find a datasheet to indicate the difference between solid and striped of each color lead. Is solid hot and striped cold? Does it matter as long as they are phase coherrent? Anyone enlighten me?

[Thermionic]

Transformers aren't fussy about polarity.

For a non-centre-tapped transformer with single secondary, check phase via oscillator and oscilloscope and off you go!


Justin

[Stitch333]

Originally Posted by Thermionic

Transformers aren't fussy about polarity.

For a non-centre-tapped transformer with single secondary, check phase via oscillator and oscilloscope and off you go!


Justin

ahhh...thats what I thought. Thanks Justin.

A quick question about installing these in a 1 RU rack chassis: should I worry about keeping the transformers completely isolated from the chassis? The project I'm doing has them snug inside the chassis. I can isolate to bottom with vinyl washers where they are bolted on, but parts other parts of the transformer connect with the inside lid, lid-lip and bottom. Will this cause any problems of any kind?

Thanks again.

[Thermionic]

Originally Posted by Stitch333

ahhh...thats what I thought. Thanks Justin.

A quick question about installing these in a 1 RU rack chassis: should I worry about keeping the transformers completely isolated from the chassis? The project I'm doing has them snug inside the chassis. I can isolate to bottom with vinyl washers where they are bolted on, but parts other parts of the transformer connect with the inside lid, lid-lip and bottom. Will this cause any problems of any kind?

Thanks again.

Just bolt them to the chassis. If your chassis is common with Gnd (it should be - preferably only in one place), grounding the transformer bracket *could* potentially help with noise rejection. Whether you can notice / measure this is another issue...

BTW - What are you building? You might get some extra tips if you tell the group.

Justin

[Stitch333]

Originally Posted by Thermionic

Just bolt them to the chassis. If your chassis is common with Gnd (it should be - preferably only in one place), grounding the transformer bracket *could* potentially help with noise rejection. Whether you can notice / measure this is another issue...

BTW - What are you building? You might get some extra tips if you tell the group.

Justin

I'm doing a transformer balanced output mod to a GSSL.

I gotta admit I was corny and got one from someone who had the basic GSSL design pretty much finished. I wanted to take it a few steps further.
This is the first mod. I have the PCB designs for the super-sidechain board and am now searching out research about the oxford modification. + a nice faceplate and R14 sifam meter!

Thanks a lot Justin!

[Stitch333]

Heres how they sit in the chassis...a bit messy and I still need to change some resistor values on the output...

[Thermionic]

Looks fine.

The only tip I can give is to tightly twist any signal cabling so it resembles a Twisted pair - Wikipedia, the free encyclopedia

There is a theoretical noise advantage, but it will also help keep things neat: if you need to debug anything, spaghetti junction won't do you any favours!


Justin

[Stitch333]

Originally Posted by Thermionic

Looks fine.

The only tip I can give is to tightly twist any signal cabling so it resembles a Twisted pair - Wikipedia, the free encyclopedia

There is a theoretical noise advantage, but it will also help keep things neat: if you need to debug anything, spaghetti junction won't do you any favours!


Justin

like this?


just a couple of resistor changes and this'll be back in the rack. Thanks again Justin and also Brad McGowan who got me on the idea in the first place with a post on some random thread.

and, of course, thanks to Jakob Erland.

[Thermionic]

Exactly

Whilst you won't notice a difference if you just twist a couple of leads, I believe that - along with other useful techniques - it all adds up in the end, not to mention the neatness factor if you need to debug.


Justin

[rotation]

Originally Posted by Stitch333

I'm doing a transformer balanced output mod to a GSSL.

Hey, can you tell a bit more about it? Did you changed the circuit or just added transformers?

Miha

[Stitch333]

Originally Posted by rotation

Hey, can you tell a bit more about it? Did you changed the circuit or just added transformers?

Miha

Its really fairly easy. several resistor change values and insert a 1:1 output transformer in the path, post-circuit, pre-XLR. You can use any flavor of output iron, I went with vintage API.
THIS is the forum where the info resides. Any questions you have about this project will, more than likely, be already answered there.