info
Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss
Potentiometer Project
41 views
Skip to first unread message
Searcher7
Nov 18, 2021, 5:33:15 PM11/18/21
to
I'm working on a custom project that involves potentiometers and picture adjustments on the monitor they are connected to.
To determine whether or not the potentiometers I need exist or if I need to build them, I need to resolve two questions and the possible issues they bring up.
1) This may seem like a crazy question, but are there low-friction potentiometers? (I'm referring to the physical friction incorporated into the pot to retard motion).
The reason I ask is because I guesstimate that in an extreme case, I'd need a potentiometer's knob/slide to rotate/travel it's full length 100 times in a single day. (Though in reality there probably wouldn't be that many cycles in a month).
This brings me to the second question.
2) Can a pot with a knob/slide that travels a distance of only one inch be adequate to cover the extremes for image parameters like Brightness, Contrast, Horizontal size, Horizontal position, Vertical size, & Vertical position?
To clarify my goal. I want to be able to quickly establish and lock in all six settings via mechanical means.
Springs will keep the knobs/slides at one side of their range, and when I need the correct settings, a plunger will ensure accurate re-positioning of the knobs/slides.
Thanks.
Darren Harris
Staten Island, New York.
To determine whether or not the potentiometers I need exist or if I need to build them, I need to resolve two questions and the possible issues they bring up.
1) This may seem like a crazy question, but are there low-friction potentiometers? (I'm referring to the physical friction incorporated into the pot to retard motion).
The reason I ask is because I guesstimate that in an extreme case, I'd need a potentiometer's knob/slide to rotate/travel it's full length 100 times in a single day. (Though in reality there probably wouldn't be that many cycles in a month).
This brings me to the second question.
2) Can a pot with a knob/slide that travels a distance of only one inch be adequate to cover the extremes for image parameters like Brightness, Contrast, Horizontal size, Horizontal position, Vertical size, & Vertical position?
To clarify my goal. I want to be able to quickly establish and lock in all six settings via mechanical means.
Springs will keep the knobs/slides at one side of their range, and when I need the correct settings, a plunger will ensure accurate re-positioning of the knobs/slides.
Thanks.
Darren Harris
Staten Island, New York.
Phil Allison
Nov 18, 2021, 10:10:16 PM11/18/21
to
Searcher7 wrote:
=============
Both slide and rotary kinds are very softy and silky in feel.
> 2) Can a pot with a knob/slide that travels a distance of only one inch be adequate to cover
> the extremes for image parameters like Brightness, Contrast, Horizontal size, Horizontal
> position, Vertical size, & Vertical position?
** Can be done.
Now stop being so fucking mysterious and pot some actual details.
...... Phil
=============
>
> 1) This may seem like a crazy question, but are there low-friction potentiometers?
** Yes - the " plastic track " types.
> 1) This may seem like a crazy question, but are there low-friction potentiometers?
Both slide and rotary kinds are very softy and silky in feel.
> 2) Can a pot with a knob/slide that travels a distance of only one inch be adequate to cover
> the extremes for image parameters like Brightness, Contrast, Horizontal size, Horizontal
> position, Vertical size, & Vertical position?
Now stop being so fucking mysterious and pot some actual details.
...... Phil
Baron
Nov 20, 2021, 5:15:15 AM11/20/21
to
Searcher7 prodded the keyboard with:
Hi Darren,
What you are asking used to be commonly done on monitor and TV
production lines, before the advent of digital circuits.
--
Best Regards:
Baron.
What you are asking used to be commonly done on monitor and TV
production lines, before the advent of digital circuits.
--
Best Regards:
Baron.
Searcher7
Nov 20, 2021, 8:00:32 AM11/20/21
to
I designed a switcher that would allow me to switch between a dozen game PCBs. All of which will individually use the same monitor.
But certain image parameters may vary from one game board to the next and it would be too much of a pain to open up the cabinet and manipulate controls on the chassis every time I needed to correct the picture. I can just connect and make them part of the mechanical switching action, which is initiated by a knob I push and turn.
If anyone has ideas on where to get sliding poteniometers I can use for thuis project, I'd appreciated it.
Baron
Nov 21, 2021, 3:02:54 PM11/21/21
to
decks ?
--
Best Regards:
Baron.
Searcher7
Nov 21, 2021, 9:08:48 PM11/21/21
to
0 new messages