[TCML] The Hammertone Predikter
f-h at c.dk
Fri Jun 26 09:50:44 MDT 2009
Paul Nicholson skrev:
> I tried to answer my own question with some spice modelling.
> With guesses of the inductance of the 50 turn CT winding, here
> is the lead time in uS over a range of frequencies, using a
> L-burden of 1uH and R-burden of 0.5 ohms:-
> Four CT inductances are modelled.
I am using a core with 5.4uH/turn^2
So: 50*50*5.4= 13.5mH
> As the CT inductance goes above about ten times L-burden, the
> curve is independent of CT inductance. For a coil operating
> in the region of 30kHz, the lead time varies by +/1uS as the
> operating frequency is pulled from 25 to 35kHz.
> It might be the case that a more refined burden network could
> synthesise a more uniform delay over a wider frequency range.
> I think that Finn's report should make some attempt to analyse
> the lead time as a function of CT and RL-burden, so that
> suitable components can be selected for any operating frequency.
> The lead-network is the crux of the circuit, but does not
> get much description or analysis.
I agree .
> Perhaps Finn can develop this into a wider-band constant-lead
Perhaps Paul Nicholson would like to be co-writer on the next version.
Or supply me with leads to follow in that direction. I'm really more of
a hardware man, as you all know. :-)
> Paul Nicholson
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