MONSTA Posted October 21, 2009 Report Posted October 21, 2009 I am about to start creating my own PCBs and was wondering the best way to wire Sparkfun Pots. I've seen the way people have been wiring pots here and they chain the vs and 5+ separately. Can I just chain 4 together with one loop going from 5+ through all the pots and back to vs (see image)? Also, can you wire these either way or are they polarity dependant. I apologise if my terminology isn't correct and you can understand what I'm saying. Thanks Niietzhe P.s. I like the new Forum! Nice one!!!
seppoman Posted October 22, 2009 Report Posted October 22, 2009 no that won't work as expected. The Vcc/GND terminals of a pot define the voltage range that can be measured at the middle pin, so if you're chaining four of them, you're in fact building a series of four 10k resistors, i.e. the usable value range would be split up into four quarters. S
protofuse Posted October 22, 2009 Report Posted October 22, 2009 (edited) you can check how I did to illustrate the thing: http://www.julienbayle.net/diy/protodeck/#pots Edited October 22, 2009 by protofuse
MONSTA Posted October 22, 2009 Author Report Posted October 22, 2009 Dam! Thought so! Thanks guys, looks like I'm either going to have to do a double sided board, which I was going to try and avoid for my first go, or do it on one side and use some insulated wire for the VS etc... Cheers Niietzshe
MONSTA Posted October 23, 2009 Author Report Posted October 23, 2009 (edited) OK here's the new design. This time is two layers, Red on top, Black on the bottom. Looks like what other people have been doing, so think it's ok, but just checking. It'll be my first attempt at a custom PCB so I expect it to go horribly wrong! LOL. Will be trying it this weekend, so just checking if this is 100% right. Thanks Monsta P.s. Does it matter which way vcc and vss are wired in? Or is it only the middle pin thats of any importance? Edited October 23, 2009 by MONSTA
lylehaze Posted October 23, 2009 Report Posted October 23, 2009 (edited) OK here's the new design. This time is two layers, Red on top, Black on the bottom. Looks like what other people have been doing, so think it's ok, but just checking. It'll be my first attempt at a custom PCB so I expect it to go horribly wrong! LOL. Will be trying it this weekend, so just checking if this is 100% right. Thanks Monsta P.s. Does it matter which way vcc and vss are wired in? Or is it only the middle pin thats of any importance? In most cases, you want the wiper voltage going up as you turn the knob to the right. Of course you can wire it the other way for a left-handed DJ.. But probably better to keep it "normal".. turning right raises the voltage, turning left lowers it. Edited October 23, 2009 by lylehaze
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