[sdiy] Fully assignable sequencer

[Pete Swarbrick]

Ken Stone wrote:
Binary thumbwheel switches. Diode OR gated from the outputs into a 4 bit
R/2R D/A converter, driven by a 4017 or similar.

I was once lucky enough to score a big bag (40+ IIRC) of BCD coded
rotary switches and used 16 of them in this way. Driven by a something
like a 4514 16-line decoder with a simple up/down/run/stop clock ahead
of it. Great fun!
 It was a bit of a pain to wire up as the switches were PCB mount and I
wasn't making PCBs then...
Worked a treat and was easier to "play" than thumbwheels but I suspect
that surplus thumbwheels are more readily and cheaply found. 
I never really finished it off but this thread has fired my interest in
doing it again properly (if I can find the bag of bits - )
Definitely recommended if you get the switches

Best
Pete

Peter Swarbrick
Head of Digital Imaging
Panavision Europe
Greenford UB6 8GD
UK
+44 208 839 7338
+44 7958 597777
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-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Ken Stone
Sent: 11 July 2007 00:11
To: synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Fully assignable sequencer

Binary thumbwheel switches. Diode OR gated from the outputs into a 4 bit
R/2R D/A converter, driven by a 4017 or similar.

Ken

>The Niessen is using rotary *encoders*, so there's not much in the way 
>of wiring. I wouldn't want to try it with rotary switches unless they 
>were pcb mounted.  For quantized voltages to supply to the switches, it

>would be easy to design a resistive divider/current source like those 
>used in old analog cv based keyboards to generate the inputs to the 
>switches, and then use an analog mux to generate the cv out.  The 
>mux/control logic could be similar to any number of old sequencer 
>designs.  A cross-bred keyboard/sequencer.  Hmmm...maybe not such a bad

>idea...
>
>-Dave
>
>Scott wrote:
>> Those rotary switches are a great idea, but looks like it would be a
LOT
>> of work to wire up.  Has there been discussion here about how to do
>> something like that?
>> The surplus store in town had a box of little 12x1 rotary switches
last
>> time I was there.. hmm.....
>> 
>> -----Original Message-----
>> Subject: Re: [sdiy] Fully assignable sequencer
>> 
>> And to be honest: the only commercial available HW sequencer which 
>> produces real usable CVs for oscillator pitch in classic tonal music
is 
>> the Niessen SAM-16. No pots but switches..
>
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_______________________________________________________________________
Ken Stone   sasami at hotkey.net.au
Modular Synth PCBs for sale <http://www.cgs.synth.net/>
Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

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