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Dirty-South Blues Harp forum: wail on! >
DIY mic transformer
DIY mic transformer
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Tom Lauten
10 posts
Aug 16, 2018
6:20 AM
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Hi everyone,
I’m setting out to make up my first real microphone.
I’m using a SA-18 dymanic module
(Data sheet here) http://www.farnell.com/datasheets/2623028.pdf
MONACO SA-18
omnidir.
100-10,000 Hz
2.5 mV/Pa
200 Ohms
I hooked this up to some test leads going straight into an amp and the quality is ok...only down to 100hz but still fine. The level is low however. I had a transformer laying around from a SUPER cheap mic and hooked that up and WHAM....very usable levels indeed.
There are no markings on the transformer whatsoever and I’ll like to reproduce the results in future. I do not have a real understanding of impedance, resistance etc etc...the basic concept and maths have always evaded me, I really am hopeless. Honest. Total mathematical and conceptual “blind spot” here.
Can anyone help by giving an idea of the type of transformer/s I might get hold of to make use of the SA-18 element so I get more reasonable levels for going into an amp and or pedal board? I don’t have a CLUE what I should be looking for in terms of names let alone specs or how those might be presented. I assume it is a small “audio transformer” that I should be looking at? See, told you...clueless!
Thanks!
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Tom "Bad Paw" Lauten
Loch Ness, Scotland
www.nimbacreations.com
Last Edited by Tom Lauten on Aug 16, 2018 6:25 AM
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Tom Lauten
11 posts
Aug 16, 2018
7:24 AM
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This is my current set up...
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Tom "Bad Paw" Lauten
Loch Ness, Scotland
www.nimbacreations.com
Last Edited by Tom Lauten on Aug 16, 2018 7:27 AM
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Larrystick
117 posts
Aug 28, 2018
9:37 AM
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Here's what you want. A Shure impedance matching transformer.
Model 51A312. Available at Full Compass. $7
https://www.fullcompass.com/prod/159591-shure-51a312-transformer-for-527a
and here are the wiring instructions from a veteran mic builder.
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 For questions mail james@simplemics.com
Stickman from walkthatwalk.com
Last Edited by Larrystick on Aug 28, 2018 9:45 AM
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