Roger Waters' VCS3 & Synthi sequencer schematics? Re: [sdiy] pink floyd and EMS

[mark verbos]

I don't see any reason you couldn't replace those shift register  
chips with another shift register, like a 74HC7731 which is a quad 64  
bit serial register. You can chain the 4 stages together and you have  
a 256 one. So that means one chip per parallel data bit, or 6 chips  
instead of 12 MF7104s. no?

for the purists,


Mark






On Nov 22, 2006, at 4:33 PM, rob wrote:

> Hi
> The EMS KS sequencer schematics are here:
>
> http://www.hinton-instruments.co.uk/ems/ks.gif
>
> As used in the Synthi AKS and DSOTM. However the shift registers are
> obsolete and nearly impossible to find. But good news, it's really  
> easy
> to replicate this 30 year old design in a modern digitally based synth
> module.
>
> Ditch the blue touch keyboard and assume people have MIDI keyboards to
> drive their analog CV based gear. Implement x2 CV and gate (note,
> velocity, note on/off) with 256 non-volatile memories, stable 12-bit
> DAC's, "bubble" 7-segment red LED displays for sequence length and
> memory number. Memory location selected by a rotary encoder. Keep the
> V/oct tune feature as a front panel control and the transposition  
> pads.
> Add in the single shot mode of the EMS Universal Sequencer and keep  
> Loop
> + Random modes. So in 2007 we will launch an Analog Metropolis module
> that does the job of the (A)KS Sequencer.. and it will be cheap.  
> Unless
> Doepfer get there first.
>
> Regards
> Rob
> www.emulatorarchive.com
>
>
> I really would like to clone the Synthi sequencer.
>
>
>