Re: [amsat-bb] sound card input

["Joseph B. Fitzgerald" <jfitzgerald@xxxxxxxxxxxx>]

For a description of how to put together "a handful of parts" to isolate
inputs, check out the appendix to "Op Amps for Everyone"  available at 

http://www-s.ti.com/sc/psheets/sloa091/sloa091.pdf

See the two "summer" circuits.

The whole book is available by chapters at

http://www.ti.com/sc/docs/apps/analog/audio_op_amps.html

-Joe KM1P
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