[TCML] The Hammertone Predikter

[Finn Hammer]

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:-
>
>  http://abelian.org/tmp/fh.090626a.gif
>
> 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
> network.
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