SV: Re: [sdiy] MOSFET leakage.

[karl dalen]

Aha, great idea Grant, cheap to! :-)

BTW buchlas wave module sounded terrible
your AND idea is splendid, i have to try 
that out on my 4vector wave module it will
shure make a splendid uppgrade, many thanks 
for the hint!

KD (KD? -..yeees! -....Why the hell didnt you 
    (came upp with that idea?   -....Ops!

--- Grant Richter <grichter at asapnet.net> skrev:

> If you think about it, the A/D bits are at 1,2,4,8,16 and so on,  
> multiples of the sawtooth frequency.
> 
> I am pretty sure those square waves and EXOR gates are all that is  
> needed for a Walsh Function Generator.
> 
> So a VCO with A/D and a CPLD would make the Walsh Functions.
> 
> On Dec 17, 2005, at 5:53 PM, Grant Richter wrote:
> 
> > I have used a 2N7000 with OK results.
> >
> > The VCO for the Terrain module replaces the analog comparator with  
> > a 20 MSPS video A/D.
> >
> > The sawtooth peak is detected as the "all ones" condition with an  
> > eight input AND gate.
> > This sets a 4013 which drives the 2N7000 across the timing cap.
> > The "all zeros" reset signal is generated by an eight input NOR  
> > gate, which resets the 4013 and starts the next cycle.
> >
> > The rest of the circuit is Terry's sawtooth core.
> >
> > The advantage is that you have simultaneous analog and digital  
> > sawtooth outputs.
> >
> > On Dec 17, 2005, at 2:34 PM, Ian Fritz wrote:
> >
>