[sdiy] Noob Question: Passive Filter Design

[Brandon Daniel]

Same for the mp-7's little brother, the mp-3. Also: Roland TR-77, CR-78.

I've got all of the above (sans CR-78), there really is something to
the inductor-based twin-t that sounds different from the stuff that
came later.

Anybody have more than just that one page of schems for the
MP-7/SR-95? I've got a live SR-95 and a dead MP-7, would be neat to do
something with the dead one.

-Brandon

On Tue, May 4, 2010 at 12:53 PM, Colin f <colin at colinfraser.com> wrote:
>
>> I have a circa 1967 Ace Tone "Rhythm Ace" FR-1 beat box - it
>> uses inductors for the various percussion voices.
>
> Ditto the Korg Minipops 7.
> PCB photo and schematics are here:
> http://www.colinfraser.com/mp7/index.htm
> Many of the sounds have no active components at all, or just a single
> transistor buffer.
> They are just resonant LC filters fed with trigger pulses.
> Count the inductors.
> Then think how long it would take you to wind them by hand.
> Has anyone ever played with gyrator-based copies of this sort of thing ?
>
> Cheers,
> Colin f
>
>
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