Which mods for phase 90?

[bancika]

I'm building phase 90 from tonepad's board (which is great, by the way) and I have few extra holes on the enclosure (it was drilled for ts808), so I'd like to put some switchable/variable mods to make phase little more versatile. There's one 6mm and two 8mm spare holes. I planned to put switchable R28 which leaves two more holes for experimenting.
What other mods would you recommend?
I saw on tonepad someone recommending rate LED mod, here's what he says:

On IC1 (TL072), connect the positive side of the led to the "7th pin" and the negative side to ground (be sure to use a resistor, about 1K, in series with the led)

Is it going to work?

Thanks,
Bancika

[iaresee]

Check out this thread I just brought back to life. In this image Aron suggests changing the R20 to a 1M resistor or a 1M pot so you have more control over phasing depth. R7 could also be made a pot if you want control over the output gain. I have no idea what R36 does but he also suggests making it a 500K pot.

[Mark Hammer]

Just about any phaser wants:
1) Variable resonance (none of this 2-position crap).  That means replacing the 22k feedback resistor with a 12k fixed resistor and a 25k-50k variable resistor.  This will get you highly resonant phasing through to very little resonance for a "spongier" feel.
2) Variable wet-dry blend.  The 150k fixed resistor from the wet side should be placed in series with a 250k-500k variable resistance.   Great for when you want to use high resonance tone but want to move the effect itself into the background a bit.

[bancika]

cool, how about this:
one pot for variable resonance, one pot for mix and switch to turn off resonance all together?
ahy thoughts about rate LED?
cheers

[iaresee]

ahy thoughts about rate LED?

It might induce seizures? 

[bancika]

yeah, it occurred to me, could be annoying, especially with ultra bright LED

[Mark Hammer]

cool, how about this:
one pot for variable resonance, one pot for mix and switch to turn off resonance all together?
ahy thoughts about rate LED?
cheers

Looking cool and being useful are easily dissociable.  If you have tap tempo and need visual confirmation of the "instructions" you have given the tap tempo circuitry with your foot, then a blinking LED is very useful.  If you set speed by ear and leave it there until you change the setting (by ear again), then what good does it do you other than maybe conserving current, relative to being on all the time?

Not sure why you need to turn off resonance.  If you do need negligible resonance then you want a log taper pot of a higher value, like 500k-1M, such that turning it down all the way is very much like being open circuit as far as the circuit is concerned.  Save the switch for somethng useful, like speed range, or sweep range, or wet-dry split for stereo effects, or vibrato.

[bancika]

If you do need negligible resonance then you want a log taper pot of a higher value, like 500k-1M, such that turning it down all the way is very much like being open circuit as far as the circuit is concerned.  Save the switch for somethng useful, like speed range, or sweep range, or wet-dry split for stereo effects, or vibrato.

didn't you say I should use 25-50k pot for resonance?
please tell me more about the other mods you mentioned.
thanks

[Mark Hammer]

Sorry about that.  Groggy from all the shovelling yesterday.  Go with a 100kk log or reverse-log pot.  The interesting changes in resonance will all be between the minimum 12k and around 30k.   You will want to get from the 30k point to maximum resistance quickly, hence the log taper suggestion.