[sdiy] transformer buffering, terminology lost - simple question and live in

[Michael Ruberto]

Anthony,

Have you tried tying the primaries in series? I would try this:

output signal to T1 brown, T1 red to T2 red, T2 brown to ground.

This will increase the DC resistance for the output signal which may 
actually help more than hurt.
If you have issues with this method you can use an active driver and there 
are a handful of good examples in here:

http://waltjung.org/PDFs/ADI_2002_Seminar_Ch6_Audio_Drivers_I.pdf

M. A. Ruberto


>From: Anthony Bisset <abisset at dspaudio.com>
>To: Steve Ridley <spr at spridley.freeserve.co.uk>
>CC: synth-diy <synth-diy at dropmix.xs4all.nl>
>Subject: [sdiy] transformer buffering, terminology lost - simple question 
>and live info
>Date: Thu, 7 Jun 2007 04:16:05 -0700 (PDT)
>
>
>hallo,
>
>i'll be playing at bonobo in sendagaya (near yoyogi station) in tokyo for
>a few nights in the coming weeks.  if anyone wants to drop in and see this
>radical serge rebuild they're welcome to.  it'll be 100% live analog
>improvisation, probably along the lines of black devil disco club and
>delia derbyshire.
>
>had a quick question.  i've mounted a bunch of 1 to 1 600ohm or 1000ohm
>audio transformers in the hyper?-serge and want to get inverted outputs as
>secondaries to the main outputs (jacks and front panel are already setup
>for this).  Anyway, being slightly handicapped as i am, i didn't realize
>that by multing the signal over to the transformer, i would lose the
>output on the original non-inverted signal, because of course, the
>transformer coil is run to ground.  do i need to use op-amps to buffer the
>signal or can a simple shunting resister drop the current flow enough that
>impedence is close enough for both outputs to work.. I tried resistor's
>from 1ohm to 100kohm and didn't have much luck, so i'm wondering do i need
>to buffer with a cap, anyway it's getting complexier than i expected.
>
>any suggestions and any interested locals please come out, the place i'm
>playing looks like the star wars bar.  if you can read symbols you're
>welcome to play the machine later in the night.
>
>-a
>
>
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