MN3101, MN3007 and MN4066

[rogeryu_ph]

Guys,
I have two each of these, what suggestion you might recommend for a project 

Thanks,
Roger

[Mark Hammer]

CE-2 chorus clone using the Tonepad Layout, and Ibanez FL-301 clone using the Tonepad layout.  Both sound good.  Save yourself some trouble and buy the boards from Francisco.

[rogeryu_ph]

Thanks Mark, but I have stock LYON Washburn Chorus and a Flanger.
Is there any other project ?

Roger

[Mark Hammer]

Consider making an add-on for your flanger to create through-zero flanging (assuming it doesn't have that capability already). This is a bit of an exploratory project with no currently available board layout or even schematic, but I'm confident something could be created.

So what would be in it?  First off, it would be very much like existing splitter/blender projects.  That is, guitar goes into a buffered input stage, with one output going to a mixer stage and the other output going to the "send" jack of a loop.  What comes back from the loop (to the return jack) is then blended in at the mixer stage with the original dry signal. 

So far so good.  Here is where we get freaky.  If the "clean" path is fed to a very short delay before proceeding to the mixing stage, then what returns from the loop for mixing can theoretically be "ahead" in time.  I imagine your existing flanger probably sweeps, like many do, from somewhere around one side or the other of 1msec to somewhere around 10-12msec.  If you can delay the "clean" signal by 2msec, using a fixed delay (and this is exactly what the appnotes for the MN3007/MN3101 illustrate), then the swept delay signal from the flanger will occasionally be further ahead in time than the clean signal.  The point where the flanger starts to impose less delay than the fixed BBD does is the through-zero point.  There is no end of threads on this site regarding through-zero flanging, and plenty of great samples of it in action at Scott Stites' "Birth of a Synth" website, as well as samples of the FoxRox Paradox TZF and EHX Flanger Hoax posted on-line.

All of this magic depends upon you being able to cancel/lift/pan the flanger signal in such a way that all you get out is the swept delay signal from it and NONE of the dry signal.  That is usually as simple as identifying the resistor for the dry signal at the mixing stage and unsoldering one end of it.  This is the very mod you would do if you were trying to make a flanger pedal into a vibrato-capable pedal.

One of the nice things about the add-on box with the fixed delay is that the clock speed for the short fixed delay will be so short that:
a) you won't really notice it
b) the sampling rate will be high enough that audio quality will not be a problem
c) the clock rate will be so high that very little lowpass filtering will be needed

The down side is that there is always the risk of heterodyning as you approach the through-zero point the difference between the two clock signals risks being audible.  Fortunately, since the fixed delay would be in a separate shielded box, the risk of clock bleedthrough by wires running too close together will be reduced.  That doesn't completely eliminate heterodyning from what I understand, but will certainly reduce one potential source of it.

That leaves one 3007/3101 pair.  With that, consider making yourself a nifty little slapback echo, OR make another chorus.  Seriously.  If you've never heard two choruses in parallel or series, you owe it to yourself.  It can produce a very rich sound indeed.

[rogeryu_ph]

Sounds like stereo flanging without zero flanging only clean delay on one side. I'l try another chorus maybe 
Thanks Mark, you really is a genius

Roger