[sdiy]was BBDs; no ..l 3 birds one stone

[phillip m gallo]

RE: BBD Clock Input

It is the large "capacitive" load present by a BBD clock input that begs for
"hard and fast" low impedance drive.

RE: AN-299 VCO

Problems replicating the app note performance have historically tied to the
schematic not indicating the "Substrate" pin needs to connect to -V.

RE: AVRSynth

Haven't followed this as close as i should, if you can "Pitch Bend" to
closer approximate concert pitch then the sample rate granularity is ok.
The Values used for the "Note to Phase Increment" just need adjusted.  Does
sound like an initial, single Pitch Bend is a good correction approach until
the table was adjusted.

regards,
p


-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl]On Behalf Of anthony
Sent: Sunday, June 19, 2005 11:50 AM
To: Seb Francis; Synth DIY
Subject: Re: [sdiy] BBDs


>> cheaper. (Their numbers are close but they're different...) The MN3102
>> makes the Vgg supply a tiny bit easier but that's about it.
>>
> I'm going to use a MN3102 since I already bought a few .. they were pretty
> cheap actually and I figured the quality of the Vgg supply would be better
> than just running a resistor off the power rail.  Not sure how much
> difference this would make, but for a few extra pence I'm happier to take
> the easy option :)
If you have one definitely use it, sure.


> Again I guess this comes down to the clock driver output impedance and
> power dissipation.  I was more thinking these shorter BBDs would be better
> because they wouldn't need to be clocked so high to get really short delay
> times.

You get a double whammy. Both are true - less need to overclock yet at the
same time greater ease in doing so. The shorter the delay you can get the
better a flanger will sound.

The very low impedence of the BBD is what necessitates the need for a
buffer. We don't want to hurt the clock driver's feelings.

B^]

> Seb
>
>
>




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