Small audio transformers?

Discussion in 'General Electronics Chat' started by rjjenkins, Jan 15, 2013.

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  1. rjjenkins

    Thread Starter Member

    Apr 16, 2011
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    Hello

    I'm trying to find a very small audio transformer - or any transformer with a ratio of about 1:10. The smallest I can find are these

    http://www.maplin.co.uk/miniature-audiotransformers-3709

    but I am sure it ought to be possible to get smaller ones. But where?

    I'm using it to step up the voltage from an oscillator to give very small electric shocks, for a TENS machine kind of device. Basically this circuit

    http://www.extremecircuits.net/2010/06/transcutaneous-electrical-nerve_03.html

    I tried this trigger transformer

    http://www.maplin.co.uk/trigger-transformers-2298

    but it didn't seem to do anything. I wasn't quite sure whether the common earth arrangement would work.
     
  2. tshuck

    Well-Known Member

    Oct 18, 2012
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    This sounds like a device designed to shock people...
    Have a look at the TOS:
     
  3. rjjenkins

    Thread Starter Member

    Apr 16, 2011
    102
    2
    Well yes, technically, but it is therapeutic and used in every hospital in the land for childbirth for the relief of pain! Tiny currents are involved.
     
  4. takao21203

    Distinguished Member

    Apr 28, 2012
    3,577
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    This should be left to biomedical professionals in my opinion.
    Besides, such a circuit is not difficult to find on the web, or to build.
     
  5. tshuck

    Well-Known Member

    Oct 18, 2012
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    Well, I'll leave it to the mods, under the terms of the TOS, this topic is forbidden, regardless of the application. However, being judge, jury and executioner, they can enforce this or not. I will wait for their ruling...
     
  6. rjjenkins

    Thread Starter Member

    Apr 16, 2011
    102
    2
    I have a circuit, I'm not asking about that. And the circuit is obvious, I could have worked it out myself. I'm just asking about subminiature transformers.
     
  7. takao21203

    Distinguished Member

    Apr 28, 2012
    3,577
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    So if they allow you the thread in favour of the TOS, I give you the information you don't need a special transformer just to feel a small electric shock.

    You could use a coil.

    It is all a question of the transistor used how much voltage will be possible to rise up.

    I have sent 20 kV through a RF choke but that's that.

    If you sent 200mA at 3 volts through the choke, and it induces back into 300 volts, you never can get a higher current than 3mA.

    It is different if you use a small transistor or a large one, small batteries or large batteries with low impedance. In the latter case you potentially can well gain a dangerous circuit.

    Know the facts of self contained safety and be safe.
     
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