🚀 go-pugleaf

On Thu, 22 May 2003 07:07:30 -0700, John Larkin
<jjlarkin@highlandSNIPtechTHISnologyPLEASE.com> wrote:

>On Thu, 22 May 2003 11:33:58 GMT, moby@kcbbs.gen.nz (Mike Diack)
>wrote:
>
>>I'm redesigning a device for blind navigation that I first designed a
>>decade or so ago, which requires a transformer to drive an
>>electrostatic transducer (sweeping 100..50KHz, around 100v P/P driven
>>from a 6v P/P source).
>>My first iteration used a (hand wound) Philips 10mm 3E25 toroid. I
>>gave one of my original samples to a local transformer outfit and
>>asked them to make me something smaller (and tidier!)
>>Everything they came back with was bigger than my original.
>>I have seen a polarisation tranny inside an AKG C460 microphone which
>>is smaller than the size of a frozen pea. Admittedly this tranny only
>>has to handle a single frequency wheras mine carries a sweep, but who
>>can make trannies like that or where can the cores be sourced
>>(preferably surface mount)
>>cheers
>>M
>
>
>The 100 Hz thing is what hurts. You could use a boost converter to
>make 100 VDC at a high switcher frequency (using a very small,
>commercial inductor or transformer) and then just power an amp off the
>100VDC.
>
>John
>
I was not clear enough in my original post...by 100..50KHz I meant
100KHz..50KHz (downward sweep)
Phil