connecting a pot

[jarthel]

in this diagram: http://www.diyaudio.com/forums/attachment.php?s=&postid=989299&stamp=1156387690

does it matter if pin2 is connected to either pin1 or pin3?

if it's connected to pin1, I assume +V is then connected to pin3?

thanks for the help

 

[mrshow4u]

Nope, it will just reverse full-clockwise setting from min to max, or vice-versa

 

[Nordic]

I still get it wrong EVERY time.

 

[poobah]

I have to learned to wire the pot backwards the first time...

Cuts down on rework...

 

[jarthel]

thanks for the replies. I am always confused with such a connection specially when my diy projects are 2 to 3 years apart.

 

[rpapps]

Hi jarthel
In actual fact, you don't need to connect the third terminal of the pot at all. Think about it. You want to make a variable resistance, so you connect the wiper (centre terminal) and one end. Which end depends on if you want the resistance to increase or decrease with rotation.
Afterthought. For this application you should use a linear taper pot.
Cheers
Rob

 

[mrshow4u]

......I'd still connect the third pin. Yes, it will work pin 1 to pin 2 only. ...but if the wiper gets noisey (and maybe opens), the circuit will not get any current. If pin 2 is connected to pin 3 and the wiper gets dirty, the circuit will still get a current path through the pot resistance.

 

[rpapps]

So instead of knowing straight away that it's broken, you'll be wondering why it sometimes takes a lot longer to operate.
In reality, once you've determined the delay you want, measure the pot and replace it with the nearest preferred value fixed resistor.

 

[mrshow4u]

yeah, something like that