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Re: basic circuit question

2008-08-10 by Tim Stinchcombe

Hi Monroe,

> It is for a Plan B envelope generator (elf).  The time range of the
> A,D,R events is much too wide, making it so that only a small angle 
of
> turn contains useful settings.  So what would you recommend?

On the face of it it looks like decresing the pot values is what you 
need to do, *BUT*, because of the 'add on' module to give voltage-
control of everything, the circuitry in the main module will 
necessarily be more complicated, and so this might not be an obvious 
mod to do. My recommendation would be to ask Peter Granader directly, 
over on the Plan B group.

> I'm confused about what Stu said.  Increasing resistance increases 
the
> voltage throughput?

No it won't, but he didn't actually say that.

>  If you go to infinite resistance by breaking the
> path then no signal goes through.  If you add a resistor in a series
> circuit, the voltage across each other resistor drops.  Intuitively,
> resistors slow down current, so adding resistance in the current 
path
> should decrease the energy of the signal.  So shouldn't the effect 
be
> the opposite?

Most of what you say here is more or less right. Stu was talking 
about adding another resistor *in parallel* (so they are joined 
together at both ends), what you are talking about above is adding 
them *in series*, and there is a big difference. When added in 
parallel, a second resistor of the same size as the existing one will 
pass the same current as the first, so you now have twice the current 
flowing, which effectively looks like you have halved the resistance. 
(And for what it is worth, I think what Stu said will only work for 
the 'variable resistance' way of using pots, and not for 
the 'potential divider' way!)

Tim

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