[sdiy] BBD Chips

[Scott Stites]

I've gotten very good results both for chorus and flanging using the MN3207.  The
spec sheet gives a 200 kHz max clock rate for a minimum delay time of 2.56 ms,
which is in the heart of flanging territory.  Seems I've overclocked the chip too
for even better results with no problem, but I'm at work now and can't remember
the particulars.  Looking at various manufacturer schematics for flangers,
choruses and ensemble choruses, it seems they routinely overclocked BBD's.  Maybe
Harry mesmerised the manufacturers and overclocking *really* destroys them =0). 

The MN3102 clock is definitely worth the few extra bucks.  It rather
uncomplicates things, and the waveshaping in it helps to ensure you don't have
any clock overlap.  Using that, the addition of a couple of transistors makes a
nice logrithmic current sink for flanging.

Cheers,
Scott

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