AnaSounds Ego Driver Tone Control not working.

[NeverRest]

Hi,

I recently built a DIY Kit Ego Driver from Anasounds, that was collecting some dust in my house.
It works great with the only exception being tthe tone control.
The tone control has no effect whatsoever and only "reacts" when fully turned clockwhise.
This "Reaction" is only audbile as added noise and if viewed on a spectrogram when beeing sine-sweeped adds some noise about 14k-16k.

I have no clue what the issue could be.
Has anyone had a similar issue or some tips on how to approach this?

Kind Regards
NeverRest



EDIT Anasounds Ego Driver Link:
https://anasounds.com/assemble-your-ego-driver/

[idy]

I can't see a schematic of the whole circuit...need to sign up to get a pdf? Can you screen grab? I see a schematic for a bass control and a "custom" alternative control? And a lesson that shows an equivalent for the two extremes of the control, but hard to know exactly how it fits in. They say these two pots are trimmers? And switched with an on/off/on toggle?

What taper did you use for the "tone" control?

Modify: now I see the tone control....

[antonis]

Hi & Welcome.. 

Could you plz post some voltages..??
(especially at pins 5, 6 & 7)

[NeverRest]

Here is a full scematic along with some test point voltages
https://anasounds.com/wp-content/uploads/2019/09/Instruction-manual.pdf

[antonis]

Here is a full scematic along with some test point voltages
https://anasounds.com/wp-content/uploads/2019/09/Instruction-manual.pdf

I'd like the author/designer to show me the way that 1M3 input impedance occured.. 

P.S.
Did you verify all those TPs values..??

[ElectricDruid]

I'd like the author/designer to show me the way that 1M3 input impedance occured.. 

It does seem a little bit optimistic!

I second what Antonis said above - we need the voltages around that op-amp IC1B.

[NeverRest]

So I now messured the TPs:
The first messurement was taken with the pedal bypassed (LED off), the second where taken with the pedal engaged.
Both sets were taken with all pots down and no input or output connected.

TP1: 8,87V/8,75V
TP2: 8,76V/8,44V
TP3: -8,52V/-8,2V
TP4: -1,798V/-1,743V
TP5: 8,76V/8,44V
TP6: -8,52V/-8,2V
TP7: 6,47V/5,636V
TP8: -1,724V/-1,672V

As for the thing with the 1M3 at the Input, can someone please explain?
I am new to all of this and want to understand your thought process.

Cheers and thank you

EDIT: As for the IC Pins:
Voltages when engaged without input and all pots down.
5 8,07mV
6 8mV
7 7,82mV

[ElectricDruid]

As for the thing with the 1M3 at the Input, can someone please explain?

There's a 470K/R3 resistor from the input transistor to ground, so that basically sets the input impedance - or at least, the input impedance can't be *larger* than that. Given that there is also 1M/R1 in parallel with R3, the actual impedance is going to be somewhat lower than 470K - nowhere near 1.3M, in short.