[sdiy] battery powered analog sequencer

[mark verbos]

If you worry about the mixer being powered from 0/+15, use a CA3130  
CMOS OpAmp. That's what the Polyfusion sequencer has, it runs on a  
single supply.

Mark




On May 24, 2007, at 6:01 AM, Tony K wrote:

> Hi list,
>
>  I want to put together your standard 4017  8-step type of  
> sequencer and
> was wondering if there are any designs I can look at out there ?
> Here's what I'd like ideally,
>
> 1) Battery/Wall wart (Boss 9v) operation.
> 2) LM324 (cause I've got these).Do I really need an "A" part ?
> 3) 4017 to drive 2 rows of 8 pots and led/trigger bus.
> 4) cheap but good mini "knobless" pots.
> 5) 5 octave range (1v/oct)
> 6) cost
>
> I won't need a clock.This will be controlling an external Vc clock  
> from a second row of eight pots.
> I've looked at Blacet for some suggestions like using an HC version  
> of the 4017, and pulled out my
> trusty IC Op-Amp cookbook and Barry Klein's book so I've got alot  
> to work with already.
>
>
> My main concerns are the single supply op-amp for the  cv mixer  
> like supply v.s. output voltage swing,offset etc.
> I don't mind going the bipolar route but I don't want two batteries  
> or some oversized wall wart thing.
> I would consider a cheap ac-dc converter.
>
> Ay suggestions or comments would be most appreciated.
>
> cheers,
>
> Tony K
>
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