John sez:
> Brilliant Dave!
>
> I'd been drifting back towards this (modular) idea since you got
> me thinking
> back to the EMu. I'm wondering what you mean by the 4X4 voltage
> source matrix?
>
I meant merely the classic rows of pots - 4 rows of 4. In this scheme, the
address generator module just generates the states, and the pots belong to a
separate module. The address generator has binary output jacks, which is a
more compact way of describing the current state than the individual gate
outputs. A 4 stage generator would need 2 binary state jacks, an 8 stage
would need 3. The voltage source matrix (pots) has matching binary input
jacks to stay in sync. Why separate these functions, you ask? Panel real
estate is one issue, another is flexibility. I may want to clock 4 of these
address generators in parallel, and use a 5th to be clocked from various
gate outputs, and in turn feed its gates back into the others. Also, the 4x4
matrix could be left out entirely if you just needed a simple 4x1 sequence,
as mentioned below. On the original Emu scheme, the address generator was 8
positions, and the pot matrix was 8x4. That took up 9" and 12" respectively
horizontally. If I was building this for myself in a MOTM context, I'd
probably build both 4 and 8 position versions. The sequencer is just going
to take up more real estate than other system components.
> -----Original Message-----
> From: JWBarlow@... [mailto:JWBarlow@...]
> Sent: Tuesday, February 09, 1999 8:00 PM
> To: motm@onelist.com
> Subject: [motm] Re: Why not breadboard a small MOTM sequencer?
>
>
> From: JWBarlow@...
>
>
> In a message dated 2/9/99 5:08:52 PM, "Dave Bradley"
> <daveb@...> wrote:
>
> >1. A 2U 4 stage address generator, with chaining capability, set
> inputs and
> >pushbuttons for each position, hold, rnd, and down. Don't need a reset
> >because of the set inputs.
> >2. A 4U 4x4 matrix voltage source.
> >3. A 2U gated 4 input mixer, that can be used with the address
> generator for
> >a simple 4x1 sequence, or to control the matrix voltage source
> output to get
> >8x2 or 16x1 configurations.
>
Dave Bradley
Principal Software Engineer
Engineering Animation, Inc.
daveb@...