mutron phaser II clone issue

[pinkjimiphoton]

hola amigos,
i just built one of these up
https://www.pedalpcb.com/product/phaseii/

i'm assuming my issue is something dumb that i'm missing, so....

ok, what it IS doing.

all opamps and the transistor working.

i can verify oscillation on the lfo, and on the mixer stage.

pin 7 of u5 i get a nice vibratto, pin 6 dry signal.

the guitar signal goes thru, tho slightly colored.

i blew thru a bunch of led's on this before i figured out i had to jumper one side of it, as the traces had let go from too much rework

so... all my voltages are good, the lfo is working, i removed the original photocells and replaced with matched ones <mostly, but with about a 30% tolerance was as close as i could get> and they are working,  it passes signal, i got phasing all the way to the output mixer stage, but after that, i get nothing!!!

all that's there is a 10u cap and a couple resistors.  i got a mixed signal on the output before the final couple components...

indeed,  i get a slightly louder signal off pin 7 than pin 5 or 6 of u5, so i assume its working correctly.

what the hell am i missing?

this is weirding me out... any ideas?

the only thing i can think of is maybe light pollution, but even wrapping the ldrs/led in black tape doesn't seem to make much difference.

i used a signal gen in the front end and traced thru the whole circuit with my audio probe, til 4 am. everything works, the pots all work, but... no phasing!! if i squeeze the board and short it with my thumb, i can hear the lfo working, i can hear the phaser sweeping, and i have continuity where it should be.but no phasing!!

checked for shorts, opens and continuity. replaced the led, the ldrs, all the opamps and the q too.  ssdd

help!!! lol

[Fender3D]

Jimi, you should have vibrato @ pin 6 and dry @ pin 5 not pin 7 and 6...
since it's a third party PCB I don't know how you could have swapped signals, but if your claim is true you have issues or short on IC5

[pinkjimiphoton]

my bad. i meant i have dry at pin 5, vib at pin 6. pin 7 appears to have both mixed together. but between pin 7 and the output, i'm losing all effect!!!

i am beginning to suspect the footswitch, there's really not much else that could be wrong.

i am completely stumped!! between pin 7 of u5 and the output cap (10u, c14) i lose the phased signal completely, and only get dry.

i guess i'll have to try and replace the 18k and 560r resistors, but it doesn't seem they SHOULD be a problem, as its passing signal thru. this is so weird!!

[pinkjimiphoton]

ok, STILL @#$%ing with this thing!!

oscillator is working.
audio path is working.
phase shift stages are working.
i have phase shift right up to the wet side of the 10k resistor at r26 on the board. the other side is bone dry.
tried replacing the resistor with various values above and below the stock 10k. smaller values make the phasing a bit more noticeable a tthe output, but not more than a very mild vibe.
also tried replacing the gain feedback resistor at r27. stock was 8.2k. i tried larger resistors, all the way up to2.2m and all it did was make the pedal louder. way louder. no resistor made an amusing distortion oscillation box that feedsback on itself almost like a delay.
ended up with a 3.3k resistor for r26, but thats a dodge at best, and the effect is barely noticeable.
i can hear it phase shift if i put my hand in the osc or phase stages areas, and i made a little black plastic hood with black electrical tape to minimize light pollution.  no difference. tried moving the ldr's closer/further. no difference.

the phasing signal seems kinda weak. i tried various dual oa's in there, too, everything i have here. no difference.

here's voltages. appears they're all almost identical. i'd suspect they're not working, but its passing signal. i am losing the phaser between the resistor and pin 6 of u1b.

circuit name : phase II
vendor: pedalpcb.com
part subs? yes, as mentioned. at the moment only r26 is different.
mods? none.
u1 thru u4 are identical, at the moment lm358 as i didn't trust some of the 5532's and tl072's i had
1  0
2  0
3  0
4  - 6.83<weak battery>
5  0
6  0
7  0
8  7.09

u5
1  modulating
2  mod
3  mod
4  -6.84
5  0
6  0
7  0
8   7.09

u6
1  -6.19
2   0
3   0
4   -6.83
5   mod
6   0
7   mod
8   6.50

u7 max1044 spc
1  7.09
2  3.51
3  0
4  -3.44
5   -6.83
6   2.42
7    4.83
8    7.09

q1
subbed a 2n4400 for a 4401
c   7.06
b   modulating
e   modulating

i am freekin stumped... can somebody help me figure this sucker out ?

i can't seem to get a decent copy of the schematic out of the pdf, sorry...
best i can do is this one

[Fender3D]

You get phasing only when wet and dry signals are the same amplitude.
If you got phasing

right up to the wet side of the 10k resistor at r26 on the board.

maybe dry signal is way higher than wet...

Try lifting C15 and check if you get phasing or vibe effect @ output.

[pinkjimiphoton]

thanks for the tip!!!!!!!!! i'll try it and post back!