A Fantastic analog Flanger !!

[Mark Hammer]

Well, though i haven't spoken to him in quite some time, Mike Irwin assured me that he had no problems whatsoever driving MN3007s out to 1mhz and beyond if he used a buffer of some type to drive the clock input pins with more current.  The typical configuration is something like we see in the Hollis Ultra-Flanger where a 4049 hex invertor is deployed with 3 of its invertor sections paralleled to feed each of the two complementary clock lines.  The specs shown on the MN3007/MN3207 datasheets are essentially for a "Matsushita-only" circuit, where a 3101 directly drives the 3007 and a 3102 directly drives the 3207.  Matsushita/Panasonic elected to ignore getting into the performance of the BBD using other sorts of driver arrangements.

Your distinction between "Will the clock generator crap out?" vs "Will the BBD be able to perform properly at high speeds under such-and-such conditions?" is entirely appropriate.  The input capacitance on the clock pins of the BBD are what causes the audio performance to fall down at higher clock rates when no allowance is made for that capacitance, but it is essentially separate from whether the 3101 is on the good or bad side of the supposed 200mw dissipation

If you look at the MN3207 you see a much more radical drop at high frequencies.  There may be some trickery going on in the MN3007 to counteract the drop off and that may explain the positive slope of the insertion gain vs frequency graph at low frequencies.

threshold.
Conceivably, it is related to whatever they did inside the chip to a) permit it to work with lower supply voltages, and b) work with a positive supply voltage.

[DimebuGG]

I wonder where should be the connector pin 7(from R2) goes to?   Did I miss something?

[George Giblet]

> where should be the connector pin 7(from R2) goes to?

It is not used.  Don't worry about it.

As I recall it went to an edge connector on the board which goes nowhere in normal use.    It may have been used for factory set-up, or the board may have been used in some other product.

[loss1234]

i must say that in 7th grade (must have been 1988) i got one of the mn3207 yamaha flangers (the pink one) and it DID sound amazing.

i still miss it.


is there much difference between the version 1 and version 2 (other than mn32xx versus mn30xx?)
i might try to rebuild it based on jc's schematic!