[sdiy] BBDs

[Seb Francis]

Hi Anthony,

anthony wrote:

>
> I'm working on one using 2 R5106's. (Probably more suitable than 3207's)
> For the MN3207's if you need really fast clocking speeds (which you 
> really do) - up to 1.5 MHz can be done - you need a buffer. Three 
> inverters for each clock phase (using a 4049).
>  
> Here's a link for that:
> http://www.hollis.co.uk/john/ultraflanger3.jpg
> It's for MN3007 but I think it's not too rough to adapt. Just tweaking 
> the bias and power supply.
>  

Is it really true you can run the MN3207 or MN3007 up to 1.5Mhz?  The 
datasheets rate them only up to 200 or 100 KHz.
Do you think this would this overheat the chips, or degrade the sound 
quality?

I guess the driver chip (e.g. MN3102) would cope fine as long as it was 
buffered as you describe.

>  
> A lot of the earlier flangers and choruses used SAD1024's and SAD512's 
> and R5106's which have a higher rated max clock speed. These seem to 
> be the more prized of the vintage flangers.
>  

Or perhaps an MN3009 or MN3209 would be good? (still only rated up to 
100KHz, but only 256-satge)

Seb