Keyboard Mechanical Design

[BJ]

Gene & Debby Stopp wrote:

> There is a circuit in Electronotes which works well - counter, 64-to-1 mux,
> latch, DAC, with latching logic that latches either the lowest note or the
> highest note, depending on which direction the counter is counting. The
> lowest note case for example gives identical behavior to a resistor string
> design such as a minimoog. I usually make it up as I build it, so they're
> all a little different. The EN design was based around 1975-era TTL, and
> has some timing problems if built with ACT/FCT parts or burned into an
> Altera EPLD (for example), but some fiddling with the logic can fix it up.
> 
> - Gene

The people who have the Book "Cmos Cookbook by Don Lancaster"
have a look at page 413.

I asume that you may use this design for a keyboard scanner,put a DAC
with internal latch, and you gate the DAC from the gate/keypressed
signal
and i think you have a simple mono kbd scanner.
Put a simple SRAM between the scaner and DAC and you have a simple
sequenser!
Put a simple 4 bit adder and you have a real time transposable simple
sequenser!
Put in a used 286 motherboard and then you have problems!(silly me) 
And since the counters are binary you get a binary output.

Or do you not gaet a mono kbd scanner?

BJ in the land of stupid politican's.