making of a small mic out transformer

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ioaudio

Well-known member
Joined
May 11, 2005
Messages
2,087
Location
vienna/austria
here are some pics from winding a small transformer which i plan to use in the measurement mics i´ve been working on for quite some time now.
link to the measurement mics:
http://www.groupdiy.com/index.php?topic=266391
the beyers are not bad, but i hope to get some improvements with the new transformer.

i go for 80 Henry on the primary, that means 4500 turns on a high nickel core, ratio is 10:1, the same as the beyer which is used now.
the primary is wound with 0,053mm wire, sec with 0,1. i was trying 0,15 for the secondary first, but it wouldnt fit.
you can click on the small pics for bigger ones.

the bobbin. material for 3 sections


cut slices for the sections and glued them in place


the bobbin measures 12x14mm outside


drilling a 1mm hole for the primary lead


glueing the lead in place


starting to wind 1500 turns per section. winding 0,053mm wire, it broke after the first 30 times. ok, slower.


first section done


starting next section




and the next


at this point you don´t want the wire to break, the sections do strange things, bending away, i heard strange noises, getting hot in here :)


primary nearly done


ok don, careful now...


fixing the lead


with things being so small, taping is quite difficult


the secondary, 3x 150 turns. i tryied 0,15 mm wire, did not fit. the 0,15 feels like a rod now, after the 0,053 hair...


ok, much better with the 0,1 mm wire


secondary finished


finished coil


enjoy,
-max
 
thanks!
no, i have a winder with a counter. i lead the wire with my hands though, no fancy cnc here.
i did my first inductors without a machine by hand, counting in my haed. that was ok for some 600 or 700 turns, but not for 4500. also the wire would break. i would get crazy.
 
here´s the mic with the new transformer. it sounds very different than the beyer, wider spectrum, less tv-sound. the quantity of the difference surprices me. have to record something for a comparisson.

new_tranny.jpg
 
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