Re: Transformer coupling question

On Sat, 18 Feb 2006 08:50:27 +0000, Robert Baer wrote:

I have a nice toroid transformer oscillator that works from about
600mV supply and up; very ligit load; made with two transistors,
collectors drive CT primary with 10 turns each side and 3 turns feedback
to the bases (biased with 4.1K to supply).
The output waveform looks like a square wave but has definite
overshoot on each edge and a little droop; did not measure the
frequency; the toroids are made with some kind of powder ferrite.
Ten turn secondary to a FWB gives about 450mV at 600mV supply, about
1.6V at 1V supply and about 5.5V at 3V supply.
What i want to do is run a common "driving" secondary winding from
this toroid oscillator to three or so other toroids (same size and type)
that each has ten turn secondaries and that FWB load (1meg, 0.1uF).
Do i need to put a resistor in series with that "driving" winding to
prevent excessive loading, and is it OK to use one turn for that or
better to use ten turns?

I kinda got lost in the middle of your explanation here - would you
draw a picture of what it is you're trying to do here? It kinda sounds
like you want your first toroid to have a sort of tertiary winding,
which then goes to the primaries of three more toroids.

How close did I guess? And what's your end goal?

Thanks,
Rich

.

Relevant Pages

  • Re: Antrim transformers
    ... > virgin-rubbed silver wire brigade have a down on toroids in hi-fi. ... It depends on the machinery one has to wind the trannies, ... There is far more than just winding a few turns on. ... But to get quality, a boss must initiate a stringent quality control enforcement ...
    (rec.audio.tubes)
  • Re: Winding a conventional AC line frequency transformer
    ... I learnt quite a bit about switchmode type transformers - I suppose ... Notably with toroids this can avoid the ... operation at lower flux levels keeps core permeability values higher. ... Bifilar windings are most useful for primaries used in parallel, ...
    (sci.electronics.design)
  • Re: Winding a conventional AC line frequency transformer
    ... I learnt quite a bit about switchmode type transformers - I suppose actually you ... Toroids also exhibit this, at least the ones I use in our high current test sets. ... tape wound steel core, typically made with high quality and very thin material. ... The primaries are already wound on the core, and you add the secondary according to their design charts for selecting number of turns and wire size. ...
    (sci.electronics.design)
  • Re: Hand Tool for Winding Toroid Cores
    ... Is there a cheap hand tool for winding toroids? ... I constructed a hand tool but it needs improvement. ... wire wrapped from end to end don't have any sharp bends in them. ...
    (sci.electronics.design)
  • Re: Variac nonsense
    ... it's no different from any other transformer with a shorted ... Toroids have low leakage inductance, ... assume a toroidal transformer has low pri-sec leakage inductance ... Magnetic coupling from one part of the winding on a variac to non-adjacent ...
    (sci.electronics.design)