I purchased a board from Moosapotamus - very nice board too! However I was less than overjoyed when i plugged my guitar in and played it (after setting it up with a frequency counter, a scope and the correct ADA calibration procedures). So - I set to work reading, downloading ALL the ADA schematics I could find and comparing them to the Boss BF2 etc.
Here is what I discovered (the board I am using is the one designed to accomodate the Panasonic MN3007 BBD chip - modified by oldschoolanalog).
The board has an additional 78L05 regulator fitted (silkscreen is 180 degrees wrong for this IC!!!!) to power the CMOS and BBD chips - why!!
I fitted a 47 ohm resistor in it's place (input to output pin on the board) to obtain the much higher headroom available ( the MN3007 is designed to work from + 15v dc anyway!!).
I fitted an additional 22k resistor (track break required) in series with the 10n capacitor and the inverting input of the gain stage immediately following the BBD outputs.
This allows a much deeper flanging effect to be heard (it could be a 20k preset with a 10k in series fitted externally if desired ).
I noticed more than one person on another 38 page thread on this site, complaining about the wobbly unatural and unusable high speed and partial solutions to this problem.
Okay - the original ADA flanger used a SAD1024 and then a MN3010 when the SAD became scarce. Both of these chips can give a 1024 stage delay, HOWEVER, they are both used as 512 stage delays in the ADA Flanger - take a closer look at the schematics - that's right, the inputs and outputs are paralleled in BOTH cases.( the MN3010 is two independent 512 stage delay lines)
The oldschoolanalog suggestion to use the MN3007, which is a single 1024 stage delay line has merit - it is still relatively easy to source and cheap (compared to the MN3005 and MN3010 etc.) BUT because we are now using double the delay line of the ADA Flanger we need to double the clocking speed to get the same results.(perhaps two MN3007 chips stacked would get closer to the MN3010 performance??!!).
The correct clocking speed should now be 69.6KHz to 2600KHz (not 34.8KHz to 1300KHz as in the ADA calibration specsheet)- don't worry the additional current buffers (CD4049) fitted, easily allow the MN3007 to be clocked at this higher speed.
I had to increase the 82k in series with the clock range trim pot to 150k to set the higher clocking speeds.(R65)
In conclusion - after these modifications the TRUE sound of the ADA Flanger was heard at last. I am genuinely surprised that no one has seemed to notice that the MN3007 was double the delay line length required for this circuit though.