Voltage controlled arpeggiator (was Re: [sdiy] Design Process)

[mark verbos]

Ian,

I don't know if this is what you mean by "priority encoder," but you  
can run each output through an XOR gate with the previous one. That  
allows only the highest stage that's on to turn on. Sadly, it takes a  
4030 for each set of 4 outputs. They add up fast.


Mark



On Feb 15, 2010, at 9:05 AM, Ian Fritz wrote:

> At 01:43 AM 2/15/2010, David G. Dixon wrote:
>> > I've been "back burnering" the idea of a voltage controlled  
>> arpeggiator
>> > lately, too.
>> > Was thinking something simple using an LM3914 bargraph driver  
>> with its
>> > outputs interfaced to some pots and a CV summer. Might be some
>> > interesting options available using the 3914 in "dot" mode and  
>> "bar" mode.
>> > "dot" mode - each step picks a voltage relative to 0V
>> > "bar" mode - each step "stacks" a voltage on top of the previous  
>> step.
>
> The drawback of the 3914 is that in dot mode there is some overlap  
> between the steps, which makes sequencer, etc, applications  
> problematic.  There is a recent thread somewhere where it was  
> proposed to use a priority encoder with the 3914 in bar mode.  This  
> might be worth pursuing.
>
> Ian
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