[sdiy] "Ghost" Electronics

[Grant Richter]

Hi Terry,
> 
> The current technique is the use of an Alesis ADAT recorder.  The original
> ADAT's were easily modified for recording and playback of signals down to
> DC, this required nothing more than jumpering a few DC blocking capacitors
> in the input and output circuitry.  The later XT version of the ADAT have a
> ADC that has an input voltage range that is not centered around 0 volts DC
> like the original ADAT, so modifying these units requires adding a small
> circuit board containing opamps for level shifting the analog signals as
> needed.  Pangolin Laser Systems makes and sells the circuit cards for this
> modification.
> 

This sounds ideal for this application!

What kind of input voltage range to the ADAT are we talking about? If I
wanted to use a +/-10 volt range (or 0-10 volt) do I need a divide by 10
into the ADAT and gain of 10 on the ADAT output?

I mean, what is the native voltage range of the ADAT recorder?

Thanks again for a valuable piece of information.

Grant