Potentiometer volume control treble loss bleed

[xslavic]

Hi
i opened this thread because i can not solve the problem of using a normal stereo pot between PREAMP and AMP
it always looses treble and tweaking it Just doesnt give the same flat curve

 

[jan.didden]

Why do you put that cap there? This makes it a high-pass filter with a turnover freq depending op the pot position.

jan

 

[xslavic]

That resistor in yellow circle is fixed ,pot is not connected to ground,so varies only the other one-
any other option?

 

[Mooly]

If it always losses treble ! is the pot value much to high for any input capacitance that the wiper might see ?

Your not using a 1meg or a 100k pot and an LPF with say a 1nf or 470 pf cap are you ?

 

[jan.didden]

That resistor in yellow circle is fixed ,pot is not connected to ground,so varies only the other one-
any other option?

Option? You put in a low pass filter and then complain of treble loss? Is this a joke?

jan

 

[xslavic]

I lose treble without cap,only hpf with cap and FIXED resistor solves the problem ,hpf 21 hz
The other fixed parallel improves quality but still not to good,does not attenuate to well
I thought adding another parallel resistor
Pot is 50k cap is 150nf and res to gnd is 51k

Correction its a HPF

 

[DF96]

To have a volume control it is not enough to put a "normal stereo pot" between preamp and amp; you also have to wire it correctly as a normal potential divider i.e. volume control.

If you wire it as a tone control then guess what: you get a tone control!!