Tommy III volume mod
- Thread starter TSReppe
- Start date
I think you could remove R5 altogether and that should help. The pot is audio taper, which is usually good for volume pots, and the 18k counteracts that somewhat making it behave more like linear pot. Clip it out, and should be easier to dial in at lower volumes, without affecting max output. Older versions of the Timmy didn’t have a resistor there, apparently over time PaulC just decided he liked the taper a little better with it in.
you could also jumper R6, which will reduce the overall output. That op amp stage acts as a boost, jumpering R6 will make it a unity gain buffer.
you could also jumper R6, which will reduce the overall output. That op amp stage acts as a boost, jumpering R6 will make it a unity gain buffer.
Cheers man!
Seems like removing R5 is the way to go. At least I’ll try that first. If I’m still not happy I‘ll jumper R6.
Locrian99
Well-known member
Leaving the 18k the same and using a b taper for the volume pot would give it more of a log. Taper then?
I don’t currently have a log 25k, though i do have 20k I suppose i could also change r5 to 15k and use the 20k but would prefer a more log taper anyways. Or just use the 20k as its a voltage divider anyways.
I’d probably just use the 20k log pot and leave R5 empty.
Using the 18k with a 25k linear pot would result in a reverse log taper, very hard to find the sweet spot for a volume pot.
Graphing the math, blue is an approximation of the log pot, pink is the Timmy (log 25k with 18k, turns out to be almost linear) and green is linear 25k with 18k.
Using the 18k with a 25k linear pot would result in a reverse log taper, very hard to find the sweet spot for a volume pot.
Graphing the math, blue is an approximation of the log pot, pink is the Timmy (log 25k with 18k, turns out to be almost linear) and green is linear 25k with 18k.
