madbeanpedals::forum

Projects => Tech Help - Projects Page => Topic started by: powerplayj on February 05, 2020, 03:20:44 AM

Title: more bite from my Runt build (SOLVED)
Post by: powerplayj on February 05, 2020, 03:20:44 AM
My cut pot nearly entirely CCW, is almost perfect.  When turning CW, It gets muddy way too soon compared to a stock Rat.  I have checked cap values which seem ok, no solder bridges could be found and I typically double check my resistor values before I populate the board.  is there a critical component which the lack of tight tolerance could critically affect the lack of treble getting through?  I'm using metal film resistors.
Title: Re: more bite from my Runt build
Post by: jimilee on February 05, 2020, 02:38:18 PM
Did you use a log taper or linear taper pot? Linear tend to get there quicker in any build.


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Title: Re: more bite from my Runt build
Post by: powerplayj on February 05, 2020, 05:39:38 PM
All my pots are 100kA, I believe...just like OEM Rat.  My problem is that I would like a bit more treble than what I get at full CCW on the pot. 
Title: Re: more bite from my Runt build
Post by: madbean on February 05, 2020, 08:15:53 PM
At full CCW the tone circuit basically does next to nothing as far as rolling off high end. You could try a 47pF in place of C4. That would give you a bit of high end back.

Title: Re: more bite from my Runt build
Post by: powerplayj on February 10, 2020, 03:34:03 PM
Changed out C4 for another ceramic 100pf cap.  ....Huge difference!!!..... much better response above and below the desired cutoff frequency.   I  will assume I got a bad original cap or one that had an extremely high (+) tolerance.