FF volume boost question

[yeeshkul]

Guys how does it work that increasing the 330 res to 1-2k increases FF volume? I know it works, i just can't explain it.

[Gus]

read about resistive voltage dividers

[yeeshkul]

here we go, thanks Gus

[Skreddy]

Also, look at the Rangemaster's "boost" control, which simply puts the volume pot in the place of those two resistors.   

[petemoore]

  If your 9vdc is DC it should ride at 9v pretty steady [only drop slow like battery does].
  Signal is AC, swinging +/- voltage = AC.
  Connect the SP to 9VDC and it can't swing.
  See mentioned rangemaster boost' pot which is a volume pot with a lug connected to V+ dc instead of ground.
   it can connect the signal path to the 'top rail' or V+*DC [we'll discuss NPN Neg Gnd. RM here] when fully CCW.
  When CCW, The AC signal is 'pinned' to DC reference [9v] and can't swing up or down = no output.
  Or..when fully CW, it can put *10k resistance between V+ and signal path [*the R value of the boost pot wafer] and have the collector connected to the output cap.
  Inbetween you have a mix, resistance goes up on one side and down on the other when pot is turned.
  The FF resistor [1K ? 470ohm..] is like turning the volume pot up...on one side, introducing more resitance to where it hooks to DC, and 'impressing' less DC  less on the signal.
  Probably not 'wrong' but not the best most complete explaination ever...Having less R between SP and a DC reference lets the signal swing +/- more.