SOLVED XC Phase not phasing

[squirrelboy]

Hi Everyone,

I have looked through the previous posts about this issue and I don't think my issue has been resolved. I am using 4 matched 2N5952s that I ordered online. I am using a 200k trimpot instead of the 250k that the documentation calls for. I am using 2 TL072s and 1 TL022.

The pedal is turning on and sound is getting through. When I slowly turn the trimpot, I can kinda manually make the pedal phase, but it doesn't do it on its own. As in, I can hear a bit of the sweep of the phase, but only when I turn the trimpot around the "sweet spot."

As you can tell from the picture below, I had to wire some resistors in series to get the correct values. I also had to do some weird wiring to use the 3PDT breakout board that I have. The LED works fine.
"

 

[MBFX]

Nothing wrong with buying ICs from Amazon -- I do it all the time (as a Prime member, you can't beat the free shipping). You just have to expect that a certain percentage of what you buy is going to end up being garbage.

I have some JRC4558s that are completely unlabeled. Just blank. 9 out of 10 work fine!

 

[music6000]

Hi Everyone,

I have looked through the previous posts about this issue and I don't think my issue has been resolved. I am using 4 matched 2N5952s that I ordered online. I am using a 200k trimpot instead of the 250k that the documentation calls for. I am using 2 TL072s and 1 TL022.

The pedal is turning on and sound is getting through. When I slowly turn the trimpot, I can kinda manually make the pedal phase, but it doesn't do it on its own. As in, I can hear a bit of the sweep of the phase, but only when I turn the trimpot around the "sweet spot."

As you can tell from the picture below, I had to wire some resistors in series to get the correct values. I also had to do some weird wiring to use the 3PDT breakout board that I have. The LED works fine.
"View attachment 62613

I'm not a fan of the Transistor socket type that you used.
v v v v This highly recommended!
Did you tin the ends with Solder so they make good contact or Did you put a wiggle in them so they fit firmly in the socket

 

[chris.knudson]

@squirrelboy Any progress on this?

 

[squirrelboy]

@squirrelboy Any progress on this?

Yes I just now desoldered all of the ICs and put in sockets and then new ICs. Still getting the exact same result. :/

 

[chris.knudson]

Yes I just now desoldered all of the ICs and put in sockets and then new ICs. Still getting the exact same result. :/

I've been doing a lot of reading on your issue, and I keep coming back to the same conclusion -- it might be your transistors.

 

[music6000]

Can you measure the voltage of the opamps
Top
Miiddle
Bottom

 

[VanWhy]

I've been doing a lot of reading on your issue, and I keep coming back to the same conclusion -- it might be your transistors.

That's what my money is on. One or a couple transistors are not working properly.

 

[music6000]

After reading that nearly everyone that builds this has issues, You have to buy at least a set of Matching quads from different suppliers & cross your fingers!
I'm glad I own a EVH Phase 90 - Script or Block button!!!

 

[chris.knudson]

After reading that nearly everyone that builds this has issues

This worries me too. I haven't tested mine yet, and those 2N5952s are hard to come by.

 

[squirrelboy]

I've been doing a lot of reading on your issue, and I keep coming back to the same conclusion -- it might be your transistors.

Welp, I guess I am now on the hunt for a new matched quad!

 

[squirrelboy]

Ok so another member just pointed out on one of my other builds that I had done some 10k resistors instead of 1M. I just noticed I made the same mistake on this build. I am going to fix it when I get home and see what happens.

 

[chris.knudson]

Ok so another member just pointed out on one of my other builds that I had done some 10k resistors instead of 1M. I just noticed I made the same mistake on this build. I am going to fix it when I get home and see what happens.

I've made that mistake too... Good luck and let me know if that does the trick.

 

[synthesiserror]

Ok so another member just pointed out on one of my other builds that I had done some 10k resistors instead of 1M. I just noticed I made the same mistake on this build. I am going to fix it when I get home and see what happens.

Hope it helps for this build. It's an easy mistake to make.

 

[squirrelboy]

HAHA IT WORKS NOW!! IT WORKS!!

It sounds glorious!!!!

You guys are awesome.

 

[jimilee]

HAHA IT WORKS NOW!! IT WORKS!!

It sounds glorious!!!!

You guys are awesome.

So how did you fix it?

 

[VanWhy]

HAHA IT WORKS NOW!! IT WORKS!!

It sounds glorious!!!!

You guys are awesome.

Was it the resistors or the transistors?

 

[music6000]

I had my suspicions when I asked about the resistors in series & the use of the Carbon film.
When I see stuff like this, I usually send this link to the Member & get them to check their values.
This is the most common mistake Members make on a build.
It is always that 4th Band Multiplier in metal film that I see & if the picture is not clear, Brown, Red & Orange are the hardest to determine!!!
You click on Bands for 5 Bands.

Resistor Calculator

Resistor Calculator is an App developed by CherryJourney to help the user find the value of a resistor.

resistor.cherryjourney.pt

 

[KR Sound]

Why can’t resistors be white so it’s easy to tell the colors? I can never tell the difference between red and brown or blue and black.

 

[music6000]

Why can’t resistors be white so it’s easy to tell the colors? I can never tell the difference between red and brown or blue and black.

It was easier when they were light blue!
That bloody 4th band metal film multiplier should be double width!
It's common practice with design to use same digit resistors in the same circuit ie 100r, 1K, 10K,100K, 1M...... 3K3, 33K. 330K ....
That's where people get caught out!

 

[chris.knudson]

HAHA IT WORKS NOW!! IT WORKS!!

It sounds glorious!!!!

You guys are awesome.

That's awesome! Glad you got it resolved.