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Trim Pot


 
4/13/2004 4:41 PM
Ross H.
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Trim Pot
I am putting a trim pot on my input stage (mostly because my faceplate already says it and I am experimenting).  
 
On first thought I figured I would just add a 50K pot in place of the 68K resistor and be done with it. Then I saw on the Blues Express schematic that the grid resistor was a fixed resistor and then there was a 1MEG pot connected to a 22K resistor to ground in place of the traditional 1 MEG resistor.  
 
Could someone explain the different effect (tonal, range, or otherwise) of these styles?  
 
Thanks in advance,  
~ Ross
 
4/13/2004 6:11 PM
Ross H.
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Alright, I think I answered my own question. The grid resistor is only going to have an impact on potential noise and interference stuff where the variable resistor to ground is going to change the signal amplitude...hence, the trim.  
 
~ Ross
 
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