[sdiy] Re: 10 step sequencer

[Dave Krooshof]

Hi again,

Thanks for all the replies, I'm gonna tick them one by one.... inline....

Jaco Sloof wrote:
>[snip: 4017 + ANDgates sollution]
>(please note, i dunno about the rise/fall time of the
>and ports,
They are usually very quick.
>  and how quick a 4017 can react on its own.
There might be some timing issues, like "will de ANDgate open up earlier
then the 4017 is switching to the next leg?" but wiping one together will tell.
>so thats a lot of "maybe" but i think this would set things in
>the right direction.
It does. And there are more maybees to hit. :-)

>Still tinkering with cmos myself, still killing 555's)
Eh, what do you mean... killing... what do they die off?


Harry wrote:

>I'd suggest using a binary counter, driving a 4051...
Yep, that's what we were thinking too.

>(this is only eight steps...I don't remember if this
>was considered OK...)
OKish

>You hook the incomming clock to the input of the
>4051, the outputs will be high for the same period
>that the input clock is...
hmmm. this sounds like a better sollution then the 4017 with ANDgates.

>Two chips. Might use a 4520 counter and have 1/2
>a counter left over...
Got it.


Tim Servo wrote:

>That's a GREAT idea. The 4051 is an analog multiplexer. Rather than using an
>AND gate to make the output pulse the same width as the input, you simply
>re-use the input pulse and switch it to the different outputs. There is a 16
>out analog MUX available too (4067).
Perfect! Thanks Tim!
>Since you're switching a logic level signal, you can still use the 
>output of the
>MUX to reset the counter (to limit the sequence length).
>Two points for Harry!
Four points for the Harry-Tim team.

>You're welcome. :) The only catch is; if you come up with something really
>cool, you have to tell us about it (or at least share some sound samples).
>Have fun!
I will... It's not an oscillator though, it'll be a controller. Hopefully.


Reminds me that I have to sample my analogue bass synth some more
and update the webpage. I know now why that thing was freaking me out
from time to time: I didn't use capacitors to couple the modules, as I was
afraid I'd use more lowfreq then I allready did. But as I was cranking up
the bass, I was also cranking up the DC that leaked in from the
controlvoltages. Debugging modules (even prefabbed ones) takes more
time then building them.



-- 
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groets,

_          >^v<        _

website http://www.dendriet.nl