A little more effect signal from the Easyvibe?

[John Lyons]

Which resistor values can I tweak to alter the effected signal from the Easyvibe?
The wet/dry balance is pretty good but with a distorted tone the swoosh gets a little lost sometimes.
It would be nice to have a little too much and then scale it back (with a pot possibly)



Thanks

John

[jrc4558]

Exchange R4 and R3

[slacker]

Wouldn't that just make the whole pedal louder? Or does the extra volume though the phase stages improve the depth of the effect?
 

[John Lyons]

I'd like to get more effect signal. Not just volume of the pedal but a higher amount of chourus/phase.
Will changing R3 and R3 do this? And do you mean just put R3 where R4 is and R4 where R3 is?

Also, does R24 tailor the depth function. What is the value used there?

Thanks

John

[Torchy]

R24 is not on the original schematic from John Hollis ...

[R.G.]

Which resistor values can I tweak to alter the effected signal from the Easyvibe?

R13 and R14. These adjust the mix for the greatest notch depth. Ideally, make R13 and R14 be 8.2K resistors and connect the outside lugs of a 5K pot between them. Take the signal off the wiper of the pot and tweak the pot for best effect.

Exchange R4 and R3
Wouldn't that just make the whole pedal louder?

Yes, it would just make the whole thing louder.

Or does the extra volume though the phase stages improve the depth of the effect?

No, it doesn't.

Also, does R24 tailor the depth function. What is the value used there?
R24 is not on the original schematic from John Hollis ...

The "depth" pot is not a depth pot. It's a width pot. It changes how widely the LFO swings the phase array. The matching of R13 and R14 for best notch depth change the perceived phasiness of the sound. You can have deep phasing and small width, or shallow phasing but wide sweep.

R24 is actually a protective component and its value is somewhat nominal.

[John Lyons]

R.G. Thank you very much sir! I'll try that out with R13/14.

One thing that I did notice is that I get 2v on pin 3 of U1A where the schematic says .35v.
What do think that could be about? All the other voltages are ok...

John

[R.G.]

That point is biased with a 10M resistor. Your voltmeter is loading down the voltage it's trying to measure. It's OK.

[John Lyons]

Ok, great! I replaced R13/14 with a 25KB pot and was able to dial in the sweet spot with a deeper phase notch.
The resistors in the board were 5% carbon film and must have been a bit off. Now the effect is more pronounced.
I'm going to replace the 10Ks (r13/14) with metal film 8.2Ks as R.G. suggested and I'll put in a trim pot to set the sweet spot.
Cool!

Thanks R.G.


John

[tcobretti]

Would it be a good idea to mount the 5k pot externally so we can play with the depth, or it is something we'll want to set to an ideal setting and leave it alone?

[slacker]

An external mix pot might be cool, thats a common mod for other phasers. The infamous "univibed" phase 45 has a mix pot and you can get some really nice tones with about a 75/25% wet/dry mix.
I think you'd want to increase the value of the pot though to give a wider mix range.

[tcobretti]

Ok, I may try that on mine.  Thanks for the help.

[John Lyons]

The trimmer I made was to set the Ratio of the two resistors which mix the dry and reverse phase signal.
I'm not sure what the ideal phase ratio is but I just set the pot to the "most notched" sound.

The two resistors that set this are both 10K and the signal is taken from the point betwen them... so In theory the ratio would be 1:1  or 50% dry, 50% reverse phase.
I'm not so sure a panel mounted pot would come in handy as you can set the depth/width control to alter the amount.

I could have used metal film resistors and gotten the same result with a tighter tolerance on values... In fact I may do this anyway.
I just wanted to play with the "mix" trimmer to see how it affected things since I felt the phased signal was weak.

John