Problem with common power supply Tone control-Amp

[aetosa]

I have built the Tone control circuit shown in Picture.
I use SINGLE supply.
The problem is that when I use common power supply for Tone control circuit and for the Amplifier (Sch1) it does not work.
When I use separate power supply for Tone control circuit and for the Amplifier it works!!
What is happening? How can I make it work normaly from one common supply?
(I've tried with different power supplies, so the problem is not the supply)

 

[advaita]

Hi

Please explain how the functioning fails with single supply. Do trace whther the output is unexpected at the o/p of tone control or amp.

The only plausible reason for this could be that you are having interference in tone control from amplifier.
You can do following:
1) Try makng a star-connection of suppy, i.e, take supply lines from tone cont and amp and short directly at the battery.
2) You may also add a low pass (very low cutoff - i don't know if its feasible or not) to the supply of tone control. Do include a resistance.
3) You may also probe the supply at the amp and the tone control and see if you are getting substantial ripple due to circuit there.