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

[Alan Murray]

Hi Brian,

Looking for clarification...

1. Are all leds the same color (or at least match the
same voltage drop - diff colors have different drops
usually)?

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?

3. What is the power source availability (9v from
battery, 12vdc from wall transformer, how much current
overhead do you have?)

4. What is your budget for the circuit?

5. Just for you or are you considering manufacturing
these?

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>

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.

Cheers,
Alan


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

> Hey guys, quick q for ya.
> 
> I'm thinking of building a circuit, and basically
> what I need is this: I have seven LEDs that need to
> be lit up in sequential order as a linear pot is
> moved. So basically as you slide the pot from one
> end
> to the other, the LED's all light up (only one lit
> at
> any given time) from one end to the other.
> 
> Idealy it could be adjusted so each LED lights up at
> a specific resistance, as I need it to be a little
> non-linear at spots - i.e. I for a couple, the pot
> would need to be moved 1/2" to move on to the next
> light, then for others it would only need to be
> moved
> a 1/4".
> 
> Somewhat confusing, I know... but it seems like it
> should be doable. But I'm no EE so I dunno how.
> Simpler the better, though. Not looking to sink a
> whole lotta money or time into this project.
> 
> As to my second question, Gene how thick are those
> backlit panels you make? Do you think you could make
> one roughly 1/8" thick, or would that be too thin?
> 
> Bria
> 
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