My phase 90 clone isn't working

[snow123]

ok, i think i probed the whole thing and i couldnt hear a full phaser effect once.

[snow123]

im thinking the issue might be the zener diode or the 2n4126, or both.

[antonis]

Measure Zener voltage (Red probe to Cathode and Black probe ot Anode) and replace 2N4126 with any general purpose p-n-p amplifier BJT, like 2N3906..

[snow123]

Measure Zener voltage (Red probe to Cathode and Black probe ot Anode) and replace 2N4126 with any general purpose p-n-p amplifier BJT, like 2N3906..

i dont have any other general purpose pnps lol

[snow123]

Measure Zener voltage (Red probe to Cathode and Black probe ot Anode) and replace 2N4126 with any general purpose p-n-p amplifier BJT, like 2N3906..

and do i put the DMM on diode test mode or 200 DCV?

[snow123]

wait i think i have the polarity of d1 reversed lol

[antonis]

5 pages for "potentially" reverse place diode..
(we're on the right track all right..)

[snow123]

5 pages for "potentially" reverse place diode..
(we're on the right track all right..)

i switch to polarity and i got about 6.9v with the trimpot at 0

[snow123]

5 pages for "potentially" reverse place diode..
(we're on the right track all right..)

i switch to polarity and i got about 6.9v with the trimpot at 0

before doing that i got about 4.2v

[snow123]

now when i plug it in the signal severely distorts and almost sounds like a super fuzz.

[snow123]

If this helps here's one of the zener diodes I'm using,

[snow123]

now i think i just have the wrong value zener, creating that weird super fuzz like distortion.

[snow123]

ok, i just got some new tl072s and zener diodes, and i swapped the op amps and diode out and ima go test it

[snow123]

I JUST GOT 4.8V FROM THE DIODE

[snow123]

i just turned on the pedal and it just let through a quieter signal, no distortion!

[snow123]

so thats 1 issue fixed, but im still not getting a phase effect at all.

[snow123]

so should i check voltages again or probe it?

[snow123]

i guess ill do voltages 'cause that makes the most sense to me.

Q1
D = 4.7
S = 4.8
G = .5

Q2
D = 4.7
S = 4.8
G = .5

Q3
D = 1.2
S = 4.8
G = .5

Q4
D= 4.7
S= 4.8
G= .5

Q5
C = 3.2
B = 3.6
E = 4.8



ICs:

IC1 (top)
P1 = 2.1, 3.4, 3.5, 3.6
P2 = 4.8
P3 = 4.7
P4 = 0.0
P5 = voltages are too inconsistent
P6 = 2.8, 2.9
P7 = 3.2
P8 = 8.9

IC2 (middle)
P1 = 3.5
P2 = 3.4
P3 = 3.4, 3.5
P4 = 0.0
P5 = 3.6
P6 = 3.5
P7 = 3.8, 3.9
P8 = 8.9

IC3 (bottom)
P1 = 4.8
P2 = 4.8
P3 = 3.2, 3.3
P4 = 0.0
P5 = 3.0
P6 = 4.5, 4.6, 4.7, 4.7
P7 = 2.0, 2.1
P8 = 8.9

[snow123]

tbh i think ill redo the circuit on a new veroboard, but this time 1 step at a time. and how would i do it one step at a time? like would i do the all of the jumper wires and the offboard wiring and then the stuff for the input buffer or what?

[andy-h-h]

tbh i think ill redo the circuit on a new veroboard, but this time 1 step at a time. and how would i do it one step at a time? like would i do the all of the jumper wires and the offboard wiring and then the stuff for the input buffer or what?

Before you tackle this again, try some simpler circuits to get your soldering skills up, and your understanding of schematics / how things work.