Transformer identification

[midibob]

Hi all,

Long shot this one, can anybody identify this transformer?
I've looked at 'LT' transformers on the net and of course it gets thousands of hits for Low Tension but nothing with respect to the part number 4149. It's the size of a 20VA mains transformer.

I don't know if this is a mains transformer or not but there are two secondaries.
Looking at the picture, the top row of tags are all connected in series so it could be a tapped 0-220-230-240-250. The bottom row, left to right is one single tapped coil with the remaining three centre tapped.
Apart from the label on the top there are no other markings.
If anyone does have a clue it might save me a fair bit of time otherwise I'll shove some low voltage AC up the primaries.

Cheers
Midibob

[ben7]

Re: Transformer identification

Hi all,

Long shot this one, can anybody identify this transformer?
I've looked at 'LT' transformers on the net and of course it gets thousands of hits for Low Tension but nothing with respect to the part number 4149. It's the size of a 20VA mains transformer.

I don't know if this is a mains transformer or not but there are two secondaries.
Looking at the picture, the top row of tags are all connected in series so it could be a tapped 0-220-230-240-250. The bottom row, left to right is one single tapped coil with the remaining three centre tapped.
Apart from the label on the top there are no other markings.
If anyone does have a clue it might save me a fair bit of time otherwise I'll shove some low voltage AC up the primaries.

Cheers
Midibob

For a small transformer like that, the primary windings' DC resistance will probably be around 50 to 150 ohms. Measure them to see what you get.

You can also use a simple 40 watt lightbulb in series to keep the transformer from being fried while you probe for the right winding When you find a low voltage winding, all the lightbulb will do is glow, and limit the current

[budm]

Re: Transformer identification

This company in England?
https://louthtxonline.co.uk/shop/pag...1ZZSJqIvVhLMIY

[midibob]

Re: Transformer identification

Thanks for the replies guys.

Budm, don't know how you managed to find the company but that looks like their logo. I'd searched for hours without success. The type number isn't listed so it's probably a special. I might drop them an Email just to see what they say.

Midibob

[Elysarian]

Re: Transformer identification

Louth? - lol... I live about 10 miles from the place when I'm not at work

[ben7]

Re: Transformer identification

Thanks for the replies guys.

Budm, don't know how you managed to find the company but that looks like their logo. I'd searched for hours without success. The type number isn't listed so it's probably a special. I might drop them an Email just to see what they say.

Midibob

What are the highest resistances you get across any two pins?

[midibob]

Re: Transformer identification

Lets see,

The top set of pins left to right measure :-
0--37.9--0--141--0--8.3--0--45--0 (quite odd for mains)

and the bottom set :-
0--1.8--0 0--8.0--0--8.3--0

Have sent a mail to the company but no reply as yet.

[midibob]

Re: Transformer identification

I've tried shoving 50Hz at 1v up the secondary single winding and get 21v across the top set of tags and 13-0-13v across the tapped bottom set.

So I would calculate (with lots of assumptions) that if the single tapped secondary winding was 12v then I would see 252v across the top set and 156-0-156v on the other.

All a bit odd.

I'm still waiting for a reply from the manufacturer which doesn't bode well.

Midibob

[midibob]

Re: Transformer identification

Received a reply this morning and the actual windings are :-

0/100/115/215/240v
0/9.5v 14.5/0/14.5v

Not sure how I got those strange figures before on the centre tapped winding but hey ho!
The txfmr is actually 11va too.

Thanks to everyone for their input especially budm for locating the website.
Midibob