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'[EE]: Need knob detent'
2002\11\11@205518 by Doug Butler

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I am making a handheld device (model train throttle) with a potentiometer.
How can I easily add a detent so the user can tell when the knob is at mid
scale.  I am thinking about the left-right faders used on stereos that have
a detent in the middle, but I don't see pots like that listed in catalogs.
Any ideas?

Doug Butler
Sherpa Engineering

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2002\11\11@205907 by Dale Botkin

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Panasonic audio pots with and without center detent:

http://www.digikey.com/scripts/us/dksus.dll?Selection?&Ref=67920&Cat=31195659&Page=1&ColumnSort=-5

Dale
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On Mon, 11 Nov 2002, Doug Butler wrote:

> I am making a handheld device (model train throttle) with a potentiometer.
> How can I easily add a detent so the user can tell when the knob is at mid
> scale.  I am thinking about the left-right faders used on stereos that have
> a detent in the middle, but I don't see pots like that listed in catalogs.
> Any ideas?

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2002\11\11@211721 by Doug Butler

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Thanks.  I had looked through a Digi-Key paper catalog and didn't see
anything promising.  However I was hoping for something with a 1/4" shaft so
I can put a large knob on it.  It may see some hard use.

Doug Butler
Sherpa Engineering


> {Original Message removed}

2002\11\11@225008 by Anand Dhuru

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Doug, how about a ganged potentiometer (2 elements)? While you use one pot
in the pair for your app., the other could drive a window comparator, A/D
etc. to
detect the mid position. This could in turn drive an LED or a piezo buzzer
to indicate the midpoint.

Wont be tactile, but should serve the purpose...

Regards,

Anand Dhuru

{Original Message removed}

2002\11\12@015135 by Roman Black

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Doug Butler wrote:
>
> I am making a handheld device (model train throttle) with a potentiometer.
> How can I easily add a detent so the user can tell when the knob is at mid
> scale.  I am thinking about the left-right faders used on stereos that have
> a detent in the middle, but I don't see pots like that listed in catalogs.
> Any ideas?


What about a small stepper motor as the pot,
which will have a lot of small detents. Although
a bit harder to interface to the PIC they feel
really "tough" and might be cool for model train
use... It will be very rugged at least. Pots
used as hand controls soon wear out and get
corrosion probs from sweat etc.
-Roman

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2002\11\12@095221 by llile

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Piher has come out with detents on their PT-10 series.  Call up your rep
and talk hiom out of a sample.

Piher US is 1-800-323-6693 or 708-390-6680.  Don't know the website,
google on Piher.


-- Lawrence Lile





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I am making a handheld device (model train throttle) with a potentiometer.
How can I easily add a detent so the user can tell when the knob is at mid
scale.  I am thinking about the left-right faders used on stereos that
have
a detent in the middle, but I don't see pots like that listed in catalogs.
Any ideas?

Doug Butler
Sherpa Engineering

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2002\11\12@115443 by Paul Hutchinson

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I looked around a bit and I don't see any inexpensive stereo balance
controls in stock at any of the normal small quantity suppliers. It used to
be you could get pots with center detents everywhere but not any more.

If you want to pay $30.00 or so you can get units designed for very high end
audio gear from http://www.audioelectronicsupply.com/.

http://www.jameco.com/ has a pot with 10 detents but nothing with a center
detent only.

http://www.bourns.com/ has quite a few models with center detent options. If
you are willing to wade through many pages of specs to come up with a part
number, then http://www.newark.com/ or http://www.mouser.com/ should be able
to get it for you (might even be in stock at Newark).

Assuming your only building one or two train controllers, then your best bet
may be to recycle the balance control from an old piece of stereo audio
gear. Since most people never use the balance control, a recycled unit may
be in practically new condition.

Paul

> {Original Message removed}

2002\11\13@165928 by Peter L. Peres

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On Mon, 11 Nov 2002, Doug Butler wrote:

*>I am making a handheld device (model train throttle) with a potentiometer.
*>How can I easily add a detent so the user can tell when the knob is at mid
*>scale.  I am thinking about the left-right faders used on stereos that have
*>a detent in the middle, but I don't see pots like that listed in catalogs.
*>Any ideas?

A nylon ball sunk in a hole with a rubber pad behind it and a small hole
(not drilled through) start in the moving part. If this is to be more
manufacturable use a leaf spring on the chassis with a bevel pressed into
it riding an axle that has a notch to match the bevel.

Peter

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