MOTM

I hacked my Oakley multimixers so that they can act as a bias source. 
It definately is a great thing to have around. I like your idea of 
using 2.500V with a gain of +/-  2 (rather than unity gain). Hmmm, I 
may have to hack my multimixers again.

At 12:17 AM -0500 2003/02/23, The Old Crow wrote:
>   At the behest of Robert Rich, I built a triple reversing+bias module to
>his specifications.  Each stage provides -/+ 5V bias in the absence of a
>jacked input, and as each output is used, it is removed from being summed
>with the next stage.  All stages have a gain of -2 to +2.  Thus you have a
>3-to-1 mixer, or a gain stage with bias, etc.  Formulaically:
>
>   2.500V
>      |
>   IN_A * (-2 to +2) = OUT_A
>                           |
>   2.500V                  |
>      |                    |
>   IN_B * (-2 to +2) + OUT_A = OUT_B
>                                   |
>   2.500V                  /------/
>      |                    |
>   IN_C * (-2 to +2) + OUT_B = OUT_C
>