[sdiy] voltage ladder with hysteresis

[mark verbos]

wait, what if I run a 1M resistor from each output to the top of the  
ladder? Then the thresholds will shift, but the effect of each  
resistor will be the same.

Just a thought,


Mark








On May 13, 2007, at 1:07 AM, mark verbos wrote:

> Hi there,
>
> I built a ladder of 16 comparators on a sequencer. The CV goes  
> through and inverting stage and thresholds are set with a string of  
> resistors from ground to -15 volts, going to the non-inverting  
> input. I found the transition points were blurry, and it needed  
> some hysteresis. I added 1M resistors from the comparator outputs  
> to the + inputs and this works fine on the lower stages, but I find  
> that when I sweep the input with a saw wave, now the lower stages  
> go slow and it moves faster as it goes to the right. All the way on  
> the highest stages wouldn't even switch right until I upped the  
> feedback resistor to 2M. Is there some standard way to figure this  
> problem out?  Should I just put a 1M on stage 1 and a 2M on stage  
> 16 and divide equally between?
>
>
> hmmm..
>
> Mark
>
>
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