Electronics > Projects, Designs, and Technical Stuff
how to specify a transformer for manufacture
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mikeselectricstuff:
No manufacturer will be interested in 1 or 10 - they are probably just fobbing you off as they think you are a timewaster.

If you want 1-10 then make it yourself - get an off-the-shelf transformer with comparable VA rating and  if possible at least one of the required outputs windings, and overwind anything else you need.
soldar:
Well, you can find a shop that specializes in prototypes and small runs. You just need to know where to look. And know how to approach them. Cold calling on the phone and rambling with unclear specs is a bad idea. Preparing clear specs in writing which the guy can have a quick overlook and realize it has all the info he needs is a much better idea. And I would try at least three possible suppliers before I came to any conclusions.

I believe what we have here is failure to communicate.
jaunty:
soldar - i'm in southern california and yes - what you say could VERY WELL be the case ... i just asked them the info they wanted and a pic of the faulty one i'm trying to replace and there seemed to be far too much 'back and forth' going on ... i told them i would send it in when i am ready to go on it ... so they can get all the info necessary when necessary but they wanted it just for an estimate - which seems silly to me .. the quote doesn't need to be so accurate - just 'in the ballpark' .. i.e. $10? $100? 10 000??? i can't be sending it out to 10 different manufacturers just for quotes ... ugh! that will take the better part of a year probably.

though reading through responses to this thread makes me think MAYBE i should get an 'off the shelf' unit with the right secondaries (need 2 18V IIRC) and just wind my own extra low voltage secondaries .. an 8v secondary might not take so many turns ...
jaunty:
soldar - i might do that - potentially (though i'm liking the stock transoformer with my own extra windings idea at the moment) - for the current rating on each winding i've just been basically mulitplying the fuse amperage times 1.5 or do you think maybe that's too close and they might get too hot? I really don't have a proper spec and just been having to guess ... but for the purposes of the estimate i dont' see how that might be an issue ...
jaunty:
PS - does anyone have a good technique for removing the epoxied cloth wrapping on one of these? it's an absolute BUGGER to get through - i was only able to dig through with an x-acto in one spot - i'm not worried about damaging the secondaries so much since two are already shorted and i may try my hand at rewinding all four (only tricky bit is that one has a tap and i'm not sure how to do that - i guess solder another wire on and feed it out) ... I suppose i could just dremel through it - i tried soaking the cloth in acetone but that did nothing really
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