[sdiy] Tap Tempo LFO

[Mike Beauchamp]

FWIW, The "Diamond Memory Lane" analog guitar effect says that it is
controlled digitally, but uses BBD chips. It also has a tap temp, etc.

Mike


On Thu, Dec 10, 2009 at 8:03 PM, Elliot Williams <elliot at speakeasy.net> wrote:
> On Wed, 09 Dec 2009 11:19:11 -0700
> Eric Brombaugh <ebrombaugh1 at cox.net> wrote:
>
>> General consensus seems to be that delays in the 1ms - 20ms will be
>> needed, so by my estimation this means we'll need a clock signal with a
>> maximum frequency of 4Mhz or so. To avoid noticeably discrete steps we
>> should probably have resolution of at least 100 steps at the top of the
>> range, so figure about 40kHz, or a delay increment of 10us in a 4k BBD.
>
> Try the AVR Tiny45.  Its timer1 is a "fast peripheral clock" that's on an 8x PLL with the CPU clock.  With the chip's internal oscillator at 8MHz, it will do 64MHz.
>
> 1/64MHz * 4k BBD = 64uS resolution.  Not the 10uS resolution you want, but good enough for rock and roll?  And 1/64MHz * 4k * 256 = 16mS before you even mess with prescaling.
>
> (I've been thinking about doing this for a while, just never gotten to it.)
>
>    Elliot.
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>



-- 
Mike Beauchamp
mobile: +64 21 0 AS I BIKE (2742453)
home: +64 4 801 8304
work: +64 4 915 4068
http://mikebeauchamp.com
http://therevox.com