Morning glory power rail question (with pix!!)

[Toneboners]

The pedal as i built it is suuuper sensitive to power supplies. Totally quiet with batteries or alone with certain wall adapters. Sadly I don't have a fancy legit isolated $$$ psu.  Now, the pedal isnt just noisy with a bit of dirty hum,, it goes full on bat$h!t squealy hissy with the "wrong" supply. It's the only pedal i've built that behaves this way and appears to be a common symptom amongst those that have built this version (effectslayouts.blogspot)((<--great site!). 

SO: looking at the schem from which the layout was created i've noticed a possible discrepancy in how the electrolytic caps are arranged. In the uploaded diagram the version i built is outlined in red vs various MG examples found on the net. I'm super suspicious of the 100uf that doesnt have its -lead to ground. Wish i knew more about electronics not to have to ask,, your comments are appreciated.

schematics

[antonis]

HI & Welcome..

Definately that 100μF cap shouldn't be arranged as it is..
(maybe in case of a band pass filter with R1, R2 & C3 but not here.. - it actually bypass R1 and makes VB almost equal to +9V for power supply ripple frequency..)

Place its positive plate to R1/R2 junction and its negative plate to GND, like in all other configurations..

[Toneboners]

Thank u for lending your expertise! much appreciated

[antonis]

I'd also suggest to make C101 47μF (it's ample for 47k/47k voltage divider), move C1 & C2 as close as physically possible to op-amp pin 8 (+Vcc) and make a LPF (100R series/220μF shunt) right after D2..

edit: Just realized C3 existence(*), so just delete C101..  

(*) C101 & C3 make a 50% impedance divider so any ripple coming from +9V is halved..

[ElectricDruid]

+1 agree with Antonis. Remove that cap C101, it's unnecessary. C3 will do the job.

[PRR]

Remove that cap C101, it's unnecessary.

Maybe someone saw the resistors wired "voltage divider" and thought "ah, the caps should be wired voltage-divider too!"

It actually works no-problem on battery. We did that on pocket headphone amps.

On wall-power OR shared power it carries external crap right to the center of the amplifier.

One cap 9V to Gnd. One cap 4.5V to Gnd.

[amptramp]

The idea of putting a parallel RC circuit in series with an identical one is to guarantee that regardless of how quickly the power supply voltage is applied, the Vcc/2 point starts at its midpoint value and does not move.  This might be necessary with some bucket-brigade devices or some op amps that have pathological behaviour when the inputs go out of the common-mode range.  Otherwise, get rid of C101.  It couples power supply variations into the Vcc/2 supply.