[sdiy] Direct Injection box?

[Jon Darby]

Howdy, everyone,
    What exactly, from an electron's point of view, is a Direct In box? I've had to play through a few as a bass player in some shows, mainly where some professional sound guy named "Smokestack" Jenkins has been hired to do the sound. I've never questioned what it was. Does it just split the signal and boost the outgoing signals to make up for any loss in the split process? What amplifier did the other output go to that required this beast? Do some PA systems run inputs at line level? The reason I ask is I was curious about sending my Theremin's audio out through my Moog Rogue's Audio In to see if I want to clone its filter to add to my Theremins, and apparently it requires a hotter signal to pass the audio through. What parts are involved in building one? It couldn't possibly be more than a slight amplification of the input audio, could it? Could a simple transistor amplifier circuit suffice? Are there any public schematics available? THank you for entertaining this wordy request!

Your pal,
Jon Darby
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