[simpits-tech] Circuit question - plus another for Gene

[Alan Murray]

I haven't really helped yet but I've got a mockup
begun in my chickenscratch handwriting...I need to
find a CAD or other package to make it pretty for
you...I'm going to work in the different colors by
leaving resistor values indeterminant until we know a
little about the led color (current) choices.

I'm working on it...

Alan

--- Brian Sikkema <bjsikkem at gimail.af.mil> wrote:

> >Looking for clarification...
> No problemo. :)
> 
> >1. Are all leds the same color (or at least match
> the
> >same voltage drop - diff colors have different
> drops
> >usually)?
> Could go either way. If it would significantly
> simplify things to have all one color, I'll do all
> one color.
> 
> 
> >2. What are you trying to emulate? i.e. Why does it
> >need to be one led at a time rather than a progress
> >bar style?
> It's going to be for a car, the gearshift indicator
> on the dash. I.e. Park, Neutral, Overdrive, Drive,
> etc.
> 
> 
> >3. What is the power source availability (9v from
> >battery, 12vdc from wall transformer, how much
> current
> >overhead do you have?)
> 12V, current should be plenty for whatever is
> needed.
> 
> >4. What is your budget for the circuit?
> Meh. Dunno really. This is a project for "sometime
> down the road" anyway. Since this is just a small
> part of the overall project 
> I don't think too much, but no hard number for that
> one.
> 
> >5. Just for you or are you considering
> manufacturing
> >these?
> Just for me right now, but the possibility of making
> more has occured to me... Would depend on the kind
> of demand I could drum 
> up. If I get mine done and other people like the
> look, I may definitely look at making more for fun
> and profit. ;)
> 
> >Btw, there exists an "audio taper" version of
> slider
> >pots which is non-linear; they are parabolic in
> gain
> >meaning that you get a very similar characteristic
> to
> >what you describe...having to come up to 33-50% to
> >achieve initial threshold and most of its operating
> >range is on the high side. These are the pots used
> in
> >soundboards. They are higher priced but designed
> for
> >heavy duty use...here is a reference
>
><www.bourns.com/pdfs/gapno_panel_controls_taper.pdf>
> Yeah I had thought of this, but I don't think an
> audio taper would work in this instance.
> 
> 
> >You are looking for a true slider pot and not a
> >rotational, right? The ref above is for rotational
> but
> >they make them in the other form as well. I only
> >mention this for your reference not that it is
> >necessarily the part of the solution.
> 
> Yep definitely a slider. The stock unit has a small
> cable that comes up from the gearshift which moves
> the mechanical indicator, 
> which is spring-loaded to pull back to the "park"
> position. Basically my thought is to re-use that
> stock cable, but hooked to a 
> slider to control the LEDs.
> 
> Thanks for the help!
> Brian
> 
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