external input (again)

[Matt Haines]

I'm reposting this, because I was unsubscribed for a little while and may
have missed something. I got John Speth's message, but anyone else, please
repost. A simple confirmation that this will work is fine! :)


>Hey, if I want to build a module that brings up external audio to +/-5v
>levels for use in my M0D00LAR, is this all I need?
>
>
>  input o----+
>             |                          3.3M
>             |                      +--/\/\/\---+
>             /                      |           |
>     100k    \      0.1    100k     |  |\       |
>      pot    /<-----||----/\/\/\----+--| \ (-)  |
>             \                         |  \     |       1k
>             |                         |   \----+--+---/\/\/\------ out 1
>            GND                        |   /       |    1k
>                                       |  /        +---/\/\/\------ out 2
>                                    +--| / (+)     |    1k
>                                    |  |/          +---/\/\/\------ out 3
>                                    |
>                                    \
>                                    /
>                                    \  100k
>                                    /
>                                    |
>                                    |
>                                   GND
>
>
>I stole this from the input of an envelope follower (with modifications).
>Is that too much gain (x33)? I think regular audio is like +/-0.5v, which
>would need a gain of 10, but that's if the input is optimal. SO I figure a
>little xtra is ok, but I don't know how much more.
>
>Or should I just use the non-inverting input?
>
>Are there any other 'convenience' factors I'm missing in this module? It
>should be a pretty simple thing, unless I'm way off.

.       .       .       .       .       .       .       .       .
    .       .       .       .       .       .       .       .
.       .       .       .       .       .       .       .       .
Matt Haines  haines at apc.net         .       .       .       .
control-X:to:abort:transmission .       .       .       .       .
    .       .       .       .       .       .       .       .
.       .       .       .       .       .       .       .       .
    .       .       .       .       .       .       .       .
Moonlight, Muzak, Knick-Knack, Paddywack