My phase 90 clone isn't working

[snow123]

ok, im pretty sure i fixed all of the shorts and im still getting a dry signal when i turn the pedal on..

In such a case we are pretty sure you have to consult an exorcist..

yea i honestly have no clue what the issue is

[snow123]

uhhhh im an idiot... it turns out i was missing the 150k resistor thats below q4, but now when i turn it on im getting more of a swooshy univibe or small stone effect but only when the speed knob is on low, and the trimpot maxed out.

[snow123]

so now i do have a phaser effect, but not the big swooshy phase 90 effect, y'know?

[snow123]

i guess what im trying to say is that it doesnt swell in and out of phase it just goes instantly out and back into phase, kinda like a univibe.

[snow123]

im thinking it could be an issue with the biasing, the phase shifting stage, or the LFO.

[snow123]

theres also no signal when the speed pot is all the way down.

[bluebunny]

ok, im pretty sure i fixed all of the shorts . . .

I feel Kevin's frustration.  How are you "pretty sure"?  Why not choose to be "absolutely certain" by doing the checks he suggests?

[antonis]

So, let's recap some standards..

wait im an idiot

wait im an idiot.

uhhhh im an idiot...

Have we any self-reflection progress..?? 

[Kevin Mitchell]

I'm happy to hear you have found the error near Q4. I hope the voltages you had shared raised some suspicion about that area as Q4 wasn't quite on par with the others (Q1, Q2 & Q3).

it doesnt swell in and out of phase it just goes instantly out and back into phase, kinda like a univibe.

I'm not sure what your interpretation of a Uni Vibe is but it's also a phaser with a similar LFO shape - it's a sine wave feeding a light bulb which results in a modified triangle wave kind of phasing due to the bulb's filament taking more time to dim than it does to turn on.

Here's a photo of some basic LFO shapes - just so you have that knowledge under your belt.


Needless to say, your LFO is oscillating but not as expected. Soooooooo check the LFO section for errors. We can promise you they exist.

[duck_arse]

well now I'm an idiot. the photo I've been looking at shows a 150k below Q4 [I think], but is missing a 22k next to Q4 [I think]. trouble is, I can't get a decent look at the board around Q4, where you have a bad voltage, and have to piece the scene together, forensics style.

please post a clear photo of the area around Q4.

[snow123]

So, let's recap some standards..

wait im an idiot

wait im an idiot.

uhhhh im an idiot...

Have we any self-reflection progress..?? 

i mean ive realized that most of the issues are caused by me being a blind idiot so ive been checking if im missing certain components and solder joints more often! lol

[snow123]

i just realized im missing this 22k

[snow123]

i just realized im missing this 22k

ok, i just fixed that, and its more like a small stone (kinda) but not like a phase 90. like its not a full sweep.

[snow123]

the effect itself is still super quiet tho. and the signal doesnt go out when i turn the trimpot or speed pot down!

[snow123]

and q4s voltages are normal now!

[snow123]

i have no clue what the issue is now

[snow123]

i replaced the 4k7 resistor and now the effect is a tiny bit louder. and i legit have 0 clue what the issue is now.

[Kevin Mitchell]

Guys, my car is broken and runs like a Ferrari.

i have no clue what the issue is now

Fix. Your. Shorts.

i replaced the 4k7 resistor and now the effect is a tiny bit louder. and i legit have 0 clue what the issue is now.

Doubtful. Stop blindly replacing parts.
You're borderline trolling by not following up on reasonable advice. It's maddening.
You can tell me you did a continuity test on every isolated track and I wouldn't believe you as I've asked you to do this serveral times and never got an appropriate response. No "hey I found it!" just doing your own thing and reporting back.

[duck_arse]

Guys, my car is broken and runs like a Ferrari.

i have no clue what the issue is now

Fix. Your. Shorts.

i replaced the 4k7 resistor and now the effect is a tiny bit louder. and i legit have 0 clue what the issue is now.

Doubtful. Stop blindly replacing parts.
You're borderline trolling by not following up on reasonable advice. It's maddening.
You can tell me you did a continuity test on every isolated track and I wouldn't believe you as I've asked you to do this serveral times and never got an appropriate response. No "hey I found it!" just doing your own thing and reporting back.

"First there is a mountain,
Then there is no mountain, then there is."

[Govmnt_Lacky]

This thread reminds me of my teenage daughter texting me.

Start text:
Dad...
End text:

Start text:
I need...
End text:

Start text:
money...
End text:

Start text:
Can you please...
End text:

Start text:
Send me some?
End text: