PCB Mounted trimpots question

Started by Duke of Metal, September 12, 2004, 05:17:08 PM

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Duke of Metal

hey guys,
Hopfully the parts for the crybaby mods will arrive here.. i just got a question about the PCB mounted trimpots.

I wanna put a 100k instead of the 33K resistor for the voicing mod.

In this picture, do I solder Pin 1 to either one of Pin2 or Pin3 and just mount it instead of the resistor??


Thanks,
Duke

niftydog

sounds about right... but it's worth checking it with a multimeter first. will only take a second!
niftydog
Shrimp down the pants!!!
“It also sounded something like the movement of furniture, which He
hadn't even created yet, and He was not so pleased.” God (aka Tony Levin)

Duke of Metal

Quote from: niftydogsounds about right... but it's worth checking it with a multimeter first. will only take a second!
So either pin 1 to pin 2 OR pin 1 to pin 3 and then just mount it??  and what would I be checking if I check with a multimeter??


Thanks,
Duke

Michael Allen

Depending on which pin you solder to (2 or 3) the direction you turn the pot to increase resistance will vary. To make sure it works, measure the resistance between the one pin and the two joined pins and make sure the resistance increases and decreases with the turn of the pot.

Duke of Metal

Quote from: Michael AllenDepending on which pin you solder to (2 or 3) the direction you turn the pot to increase resistance will vary. To make sure it works, measure the resistance between the one pin and the two joined pins and make sure the resistance increases and decreases with the turn of the pot.
Ahhhh.. awsome. thanks!!  I will try that when the parts finally get here.


Thanks,
Duke

bazzwazzle

http://www.allaboutcircuits.com/vol_6/chpt_3/7.html

at that page scroll down and there are two pages which show when you connect certain lugs if you get mroe or less resistance when you turn the pot.

Duke of Metal

Quote from: bazzwazzlehttp://www.allaboutcircuits.com/vol_6/chpt_3/7.html

at that page scroll down and there are two pages which show when you connect certain lugs if you get mroe or less resistance when you turn the pot.
Man you guys are awsome...

Thanks buzzwazzle.. that definitly helped  :)...

so it says if I connect the middle pin (pin 1) to the right pin (pin 3), it'll give more resistance when turned clockwise...   but would that mean it'll have a wider resistance range??


thanks,
Duke

bazzwazzle

no it just means what happens when you turn it. you'll either have the minimum resistance when the knob is not turned (all the way counterclock-wise), and it will increase as you turn it clockwise, or you have it wired so it's at maximum resistance when it's not turned, and it decreases in resistance as you turn clockwise. It only reverses what happens when you turn it. It doesn't affect the amount of resistance or anything like that.

Example: say you wiring a volume knob, if you wired it the other way, when the knob is all the way down, you would have maximum volume, and when you turn it up the volume gets lower. If you wired it the other way, when you turned the knob up the volume would increase, and vice versa.

understand?

Duke of Metal

Quote from: bazzwazzleno it just means what happens when you turn it. you'll either have the minimum resistance when the knob is not turned (all the way counterclock-wise), and it will increase as you turn it clockwise, or you have it wired so it's at maximum resistance when it's not turned, and it decreases in resistance as you turn clockwise. It only reverses what happens when you turn it. It doesn't affect the amount of resistance or anything like that.

Example: say you wiring a volume knob, if you wired it the other way, when the knob is all the way down, you would have maximum volume, and when you turn it up the volume gets lower. If you wired it the other way, when you turned the knob up the volume would increase, and vice versa.

understand?
Yep.. definitly helps.  Thanks!!

see, like i mentioned earlier, I wanna install a 100k trimpot instead of the 33k resistor in a crybaby for the vocing mod, and I wanna be able to sorta be able to tweek it higher and lower in the resistance value for different vocing sounds.    I guess first to do that, I have to use a multimeter to find the 33k position on the dial on the trimpot and then install it.  no?


Thanks,
Duke

niftydog

well, that's not really necessary. BUT you do want to make sure that the circuit can handle a short circuit, because if you tweak that pot right down, that's what you'll get!
niftydog
Shrimp down the pants!!!
“It also sounded something like the movement of furniture, which He
hadn't even created yet, and He was not so pleased.” God (aka Tony Levin)

Hairston

Quotewell, that's not really necessary. BUT you do want to make sure that the circuit can handle a short circuit, because if you tweak that pot right down, that's what you'll get!
Good point N-Dawg! It would probably be safest to put a 1k (or 10k) resistor in series with the pot to make sure a short wouldn't inadvertantly damage the circuit.

-HB

Duke of Metal

Thanks guys..

Hairston.. I'll definitly put a 1K resistor in series with the pot.


Thanks,
Duke