My phase 90 clone isn't working

[ElectricDruid]

IC3 (bottom)
P1 = 0.0
P2 = 0.0
P3 = 2.9
P4 = 0.0
P5 = 3.2/3.3
P6 = 0.0
P7 = 1.4
P8 = 9.0

The pin 3 and pin 5 voltages look wrong. The second pair of phase shift stages are the same as the first pair based around IC2, so we'd expect to see the same voltages, e.g. pins 3 and 5 both at 4.2V (compare with your previous IC2 readings). But for some reason this socket isn't giving those readings.

You should have a careful look around that chip and the associated components and see if you can spot anything; wrong values, wrong component, component wrong way around, bad joint, short between tracks, bit of muck, etc etc.

HTH

[snow123]

i think i should note that i already used all of the 47nf caps and all of the tl072s before..

[snow123]

and the 250k trimpot

[snow123]

And I just swapped out some of the 47nf's with new ones.
Here's the wiring and stuff:

[snow123]

now the pedal does add a bit more gain, and when i flip the switch to the down postition, it adds a bit more treble

[snow123]

so im thinking the op amps are the issue

[snow123]

so im thinking the op amps are the issue

and the soldering to a degree

[snow123]

it basically seems like the circuit is doing everything except the phaser thing

[snow123]

and i just tried it with 4558s (since i dont have any other tl072s that dont have any solder on them or anything) and nothings changed.

[andy-h-h]

it basically seems like the circuit is doing everything except the phaser thing

Time to get out your probe    try pin 1 and 7 (amplifier outs) on the opamps, bearing in mind that one is a LFO and will not carry audio signal. 

Read the Phase 90 analysis on electro smash.   Ignore the maths....    Just try and get an idea of what is happening and where.  This might help your fault finding. 

[snow123]

on q1-q3s drain, its just sorta a glitchy version of my dry signal, and on the source and gate of q1, 2, and 3, its just a high pitched feedback noise, and on all legs of q4 its just high pitched feedback.

[snow123]

on q1-q3s drain, its just sorta a glitchy version of my dry signal, and on the source and gate of q1, 2, and 3, its just a high pitched feedback noise, and on all legs of q4 its just high pitched feedback.

well its a high pitched feedback when im not playing

[snow123]

(top) ic1:

P1 = weird feedback when not playing, weird low volume and glitchy dry sig when playing.
P7 = sorta a very weak tremolo effect

(middle) ic2:

P1 = same as ic1 p1
P7 = just a very weak dry signal

(bottom) ic3:

P1 = also a very weak dry sig
P7 = quiet, rapid popping effect

[andy-h-h]

The IC at the bottom - left hand side is the input buffer.   The right hand side is the LFO. 

You should be getting a nice clean signal off pin 1, as that's the output from the buffer.   If you aren't, the rest of the circuit has no chance of working. 

It's basically two signal paths combining at the transistor q5.  One is the clean signal from the buffer, the other is phased - which is also fed from the buffer before the phasing happens.     

[antonis]

(since i dont have any other tl072s that dont have any solder on them or anything)

You use sockets, don't you..??
(how comes solder on ICs..??)

[snow123]

(since i dont have any other tl072s that dont have any solder on them or anything)

You use sockets, don't you..??
(how comes solder on ICs..??)

i previously used those ICs before without sockets.

[antonis]

i previously used those ICs before without sockets.

Some wealthy guys claim that unsoldered semiconductors are NOT reusable..

[snow123]

How does everything here look tho?

[snow123]

this is what i mean by ic 1, 2, and 3 btw.

[snow123]

The IC at the bottom - left hand side is the input buffer.   The right hand side is the LFO. 

You should be getting a nice clean signal off pin 1, as that's the output from the buffer.   If you aren't, the rest of the circuit has no chance of working. 

It's basically two signal paths combining at the transistor q5.  One is the clean signal from the buffer, the other is phased - which is also fed from the buffer before the phasing happens.   

do you mean like pin 1 for all of the ics? and do you mean that like all of ic3 is the input buffer or just p1-p4? the way you phrased it is kinda confusing for me.