Firstwatt B1 pots

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jankar

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  • Posts: 2
Firstwatt B1 pots
« on: 5 Oct 2017, 04:41 am »
Hi everybody
I'm bit confused how wiring pots to circuit board.( I have 2 identical mono pots)
Markings on board CCW-W-CW and CW W CCW.
Need help please.

jparkhur


Chris Adams

Re: Firstwatt B1 pots
« Reply #2 on: 5 Oct 2017, 03:01 pm »
CCW = Ground
W = Output
CW = Input

richidoo

Re: Firstwatt B1 pots
« Reply #3 on: 5 Oct 2017, 03:03 pm »
https://www.passdiy.com/project/preamplifiers/b1-buffer-preamp

CW = clockwise
W = wiper   
CCW = counter=clockwise

http://www.wikihow.com/Wire-a-Potentiometer
https://www.build-electronic-circuits.com/potentiometer/



From this picture of the original PassDIY B1 PCB, CCW is ground, CW is input, and W is output of the pot.  If you have two separate mono pots, wire each one like this, with CCW as ground.

It means as you turn the volume knob CCW, the wiper moves closer to ground, and away from input. The resistance to the signal increases and volume goes down. When you turn it CW, wiper moves toward the signal, resistor gets smaller and volume goes up.

You can't do much damage experimenting here, even if it were turned on. But you can find the right connections with it turned off. The center terminal of the pot is usually the output of the pot, so it should go to the W on the PCB.

You can connect a ohmmeter to the pot to simulate your hookup to see what happens when you turn the knob. Change the connections around and see how that affects the signal when pot is turned.

jankar

  • Newbie
  • Posts: 2
Re: Firstwatt B1 pots
« Reply #4 on: 5 Oct 2017, 05:38 pm »
Thanks for everyone.