want to build a hd portable recorder.

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#2
Personally, i'd buy a used laptop off ebay and a USB/PCMCIA soundcard which is capable of recording 24/96 digital audio.

Building a portable recorder that resembles the device you linked is possible, but not easy and certainly not cheap.
 
#4
Well, you will need to go surface mount to get the electronics small and robust enough, and learn a lot of coding to write some custom software to drive the HD and interfaces.

I would just get one S/H from ebay or similar, unless you have a couple of years to spare! 🙂
 
#5
You can probably do it as follows:

AES/SPDIF inputs -> SC939-06 transformer (sorry Jocko) -> CS8414 -> Microchip dsPIC w/codec interface -> hard drive. You'll also need the appropriate power management stuff (+5V/+12V supplies, battery charging, etc) to make a true 'portable' application.

My only worry is that the HD won't be fast enough - you'll need a FIFO in the dsPIC which is big enough to not overflow when you're waiting for the HD to finish a write, and the dsPIC doesn't have a whole lot of memory. An external SRAM could hopefully take care of this.
 
#6
Gmarsh, is difficult to do this? What about writing the codec sofware? and what about the price aproximatly?
The Edirol r-4 costs around 1500 $.
The building of my own recorder would must be cheaper and not "two years work" of course. Let me know.
 
#8
lagoausente said:
Gmarsh, is difficult to do this? What about writing the codec sofware? and what about the price aproximatly?
The Edirol r-4 costs around 1500 $.
The building of my own recorder would must be cheaper and not "two years work" of course. Let me know.
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The price? hard to say. You could probably put all the required chips and passives on a PCB for ~$100-ish. Then you're paying for the hard drive, enclosure, batteries, etc...

You'll have to design the schematic and PCB, write the dsPIC software for writing to the HD in the "right places" (not overwriting existing files) - which involves writing it in assembly code unless you want to buy a C compiler for the dsPIC... build it, verify it works (again, i'm not sure if the dsPIC has enough RAM to buffer a stream to the hard drive)... possibly build another board from scratch using a 'proper' DSP chip if that didn't work... the list goes on.

It's not an easy "throw chips together" project like a basic DAC...

pinkmouse said:
I wonder if you could hack an iPod?
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The iRiver IHP-120 already supports optical SPDIF recording... I have my doubts it's 24/96 capable though.
 
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