[sdiy] "Ghost" Electronics

[Chris Crosskey]

One though tI've had is one of those old open-reel four-track data
recorders...I used to have one that I was trying to use for audio recording
.....that would prolly take next to nothing except some scaling
amps/attenuators to use in this application, and it would look way cool
too....big open-reel fourtrack.....

chrisc

> -----Original Message-----
> From: Grant Richter [mailto:grichter at asapnet.net]
> Sent: 21 March 2001 16:39
> To: 104065.2340 at compuserve.com; synth
> Subject: Re: [sdiy] "Ghost" Electronics
> 
> 
> 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
> 
>