Real Rings and Steiner Filters
2006-01-23 by Gerald Stevens
Ah... yes - I see. I could have used a transformer with the same number of
primary and secondary windings. I thought it needed to be stepped down for
some reason related to the diodes... guess I was wronge there. It works
beautifully by the way - very little leakage of the input signals.
One more question - my Steiner filter doesn't self-modulate, but other than
that it's working fine. It does ring a bit (can see it on a square
wave-form), but not as much as some samples I have heard on the web. I have
changed the 1k resistor just above the res pot in the diagram to something
else (can't remember what right now), and that helped, but not that much. I
tried different 2N2222 transistors, thinking that maybe it was responsible,
but it sounds the same. What else can I try to beef up the resonance?
-gerald
primary and secondary windings. I thought it needed to be stepped down for
some reason related to the diodes... guess I was wronge there. It works
beautifully by the way - very little leakage of the input signals.
One more question - my Steiner filter doesn't self-modulate, but other than
that it's working fine. It does ring a bit (can see it on a square
wave-form), but not as much as some samples I have heard on the web. I have
changed the 1k resistor just above the res pot in the diagram to something
else (can't remember what right now), and that helped, but not that much. I
tried different 2N2222 transistors, thinking that maybe it was responsible,
but it sounds the same. What else can I try to beef up the resonance?
-gerald
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On 1/22/06, sasami@... <sasami@...> wrote:
>
> >I had assumed that these were gone for good, and put one together myself
> >with some old germanium diodes. A question about the schematic - are
> the
> >input and output on the primary windings (meaning, the circuit steps down
> >the voltage, modulates, and then steps it back up?
>
> No, well, not intentionally. It may happen as a side effect of the
> transformers chosen. The important job the transformers do is signal
> cancellation as the signal is forced in opposite directions through the
> separate halves of the secondary windings on the same cores.
>
> Ken
> _______________________________________________________________________
> Ken Stone sasami@... or sasami@...
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