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  #1  
Old 02-01-2013, 01:22 PM
MPU MPU is offline
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Join Date: Sep 2004
Location: Valkeala Finland
25kohm pot instead of 10kohm pot?

I'm modifying cAMPus filter pre. Vol pot is 10k on schematic. I want a push/pull vol pot for switching boost amount and get rid of Q level pot. Can I use 25k instead of 10k? What difference can I expect?
  #2  
Old 02-01-2013, 06:37 PM
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Originally Posted by MPU View Post
I'm modifying cAMPus filter pre. Vol pot is 10k on schematic. I want a push/pull vol pot for switching boost amount and get rid of Q level pot. Can I use 25k instead of 10k? What difference can I expect?
I use a 50K in mine so 25K wouldn't be a problem. I put in a push/pull pot to bypass everything so I can run the pickups directly to the jack. This is for running the bass through an outboard Varitone and various preamps. As far as bypassing the Q pot that would be altering the circuit itself. I found great tips in more electronic design intensive forums like freestompboxes.com http://freestompboxes.org/viewtopic.php?f=10&t=10570
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Old 02-01-2013, 09:51 PM
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A 25k pot is going to change the behavior of the circuit. You should stick with the recommended value if you want the control to function properly.
  #4  
Old 02-01-2013, 11:46 PM
MPU MPU is offline
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I just found a 10k push pull pot so that will be used. I'm not leaving the Q level out, I'm replacing it with switchable resistor. Works fine with a switch, now I just want to get rid of the switch and need for extra hole.
  #5  
Old 02-02-2013, 04:34 PM
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I forgot to mention I tweaked some resistors and capacitors in the Q stack to my ears because I didn't like the initial sound of it. so thats why a 50K pot worked for me. I mimicked a similar state variable filter design I found on the Internet
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