where to source silicon steel transformer winding kit.

Farnell used to sell kits but don't seem to now.

These people quote smallish quantities.

https://www.edcorusa.com/

The two UK sources below may not sell in small quantities - they don't have very inspiring web sites.

ASCO Components - Transformer Laminations, Bobbins, Angles, Frames, Terminals and Enclosures.

L&H components ltd

There are audio transformer kits on ebay that might do.

https://www.ebay.co.uk/itm/Ni80-ee24-25-laminations-bobbin-DIY-premium-audio-transformer-x2/123006494304?_trkparms=aid%3…

or you could buy a small transformer and re-wind it - use a toroid or dual bobbin type. If you start with a 12V 50Hz transformer you can cut down the number of turns by about 2.8 times for 400Hz working. Try to find one that is not varnish or plastic potted.

What do you need it for ?

MK

Hi Mike,

Thank you very much for you valued information. I have been trying to source these types of components on and off for several months. I do remember when Farnell used to sell them.

The transformers I want to build are for use with Synchros and Resolvers as a hobby project. I have built a resolver reader interface card which generate sin/cos at 400Hz. works very well on 2 phase synchros, but I also use 3 phase resolver too and wanted to drive them from the same interface card. I can achieve this if I can translate the sin/cos drive to be 60 degrees apart instead of 90 and then ground the third pin of the 3 phase resolver. This produces three rotating vectors all 120 degrees apart. So the transformer is a sort of Scott connection (Modified) that feed a bit of the Sin channel into the Cos channel thus changing the 90 degree phase angle to 60 degrees. The winding ratios need to be accurate and I have not found anything off the shelf that can do the job so decided to wind my own.

But first I need to acquire some core kits, I'll be on it first thing Monday morning.

Thank you again for your help.

BR Pete D.

Hi Mike,

Thank you very much for you valued information. I have been trying to source these types of components on and off for several months. I do remember when Farnell used to sell them.

The transformers I want to build are for use with Synchros and Resolvers as a hobby project. I have built a resolver reader interface card which generate sin/cos at 400Hz. works very well on 2 phase synchros, but I also use 3 phase resolver too and wanted to drive them from the same interface card. I can achieve this if I can translate the sin/cos drive to be 60 degrees apart instead of 90 and then ground the third pin of the 3 phase resolver. This produces three rotating vectors all 120 degrees apart. So the transformer is a sort of Scott connection (Modified) that feed a bit of the Sin channel into the Cos channel thus changing the 90 degree phase angle to 60 degrees. The winding ratios need to be accurate and I have not found anything off the shelf that can do the job so decided to wind my own.

But first I need to acquire some core kits, I'll be on it first thing Monday morning.

Thank you again for your help.

BR Pete D.

Wow, it has been a long time since I even heard anyone talking about synchros and resolvers. I hope you blog about your project here.

Well, they are still very much used in the aviation industry today .

My project is actually in building flight simulator instrument panels using as realistic instrumentation as is possible. This is a mix of conventional clockwork instruments and modern EFIS displays. Last year I got my hands on three sets of professional Frasca instruments and the interface for these instruments covers a very broad range of technologies. Air Core motors, Standard DC brushed motors, stepper motors, you name it they are there somewhere. On the sensor side either Sychros are used or multi turn Linear resistance Potentiometers. I threw away the 1970s electronics and designed my own from scratch using Arduinos.

I have an aviation background but have really enjoyed getting these all to work properly. Great fun when they do..............

Sounds like an awesome project. It would definitely be interesting to see some pictures as you progress.