Duo Phase weaker B side

Matopotato

Active member
I just finished setting up a Duo-Phase build. I did the instructions from third post and link in second here, and that seems to work.

20250106_124447.jpg

I put the trimmers on pots for external control and add shields @Chuck D. Bones style.
But I still feel the Blue side/first side/B-side/right from knob view/left from gut shot sounds a bit weaker. It dose not phase as much. The Amber/A-side is what I was hoping for.
The only visual difference is that the LED on B-side seems a bit more dimmed, and the LED on A-side more clear. It is hard to show in pictures and bring justice to the differences. In the A-side one you can see the source as a center brighter spot, but on B-side it is dimmed so that does not show.

Could the difference in LED brightness be a reason the sides sound so different, or is the B-side supposed to be quite a bit "mellower" in its phase-sound?

LEDs on:
20250106_124713.jpg

LEDs off:
20250106_125740.jpg
 
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ok I come here because I have the same problem (even if the sound is good I don't think this brightness is normal, the effect could be more intense). Have you identified the resistance that determines the intensity of the LED ?
 
Since it is the B side that is the weaker one, I felt when set to B (and they are independent) Innotice the difference, when set to A I felt A way of sounding sort of took over.
Reverse I could not tell much changed at initial trying things out so did not experiment with it either. I thought it was more about phase shift?
 
Does it make a difference if you invert or sync to the other LFO?
No, I would say the switches do their things: When set to A, the rate of B changes to the one of A, but sounds as weak still. Invert I can tell something happens, but no change to the strength of B.

EDIT: I can't see any differences in the section around the LEDs, so it does not seem to be any built in feature.
I will try to hunt down a yellow LED with a bright center, not a fully clear one, that it is probably too much. But the dimmed one seems to make the phaser on that side too weak. That said, A-side is not like a crazy all-over-the-place phaser, but I was not expecting (nor hoping) for that either
 
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