[sdiy] sds-800 envelope - D'OH! :)

[adam at hoodmusic.net]

Hi
    try this:
        http://www.midwest-analog.com/bsschem.html
In the top center of the page is the decay gen, components D3, C8, R3, R10, R31,
R7 and Q2 make the decay generator. D3 is the trigger input and the junction of R7
and Q2 is the output.  Pretty simple.

adam

"Drew Smith (mux)" wrote:

>
>         Argh - sixth time I'm sending this email - thought this whole time that
> the list server must be malfuntioning, but it turns out it was just me
> being stupid and sending from the wrong address. :)  Let's try this one
> more time...
>
>         Hey folks,
>
>         I'm modding my Simmons SDS-800, hopefully adding a secondary decay
> envelope to the kickdrum.  I've tried just using the envelope from one
> of the other voices (tom2, in this case), and it doesn't look like I can
> do that without significantly modifying the envelope circuit, rendering
> tom2 unusable.
>
>         I understand that a simple decay-only envelope generator is a matter of
> a few resistors, a pot, a capacitor, and an op-amp - but I don't know
> nearly enough electronics theory to design such a circuit myself.  Can
> someone point me to a simple schematic that fits my need?
>
>         (I'd be looking at a more complex project, but I live in Costa Rica,
> and as far as I can tell, the only place to buy components is Radio
> Shack - so I have to stress, a *simple* circuit! :)
>
>         Thanks in advance,
>
>         Cheers,
>         - Drew.
>
> PS: if it comes into question, the schematics for the SDS-800 are
> available at http://riotnrrd.com/mux/sds800...
>
> --
> Drew Smith (mux) <drew at riotnrrd.com>
> Encrypted e-mail preferred - finger for public key.
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