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Old 21st April 2003, 06:54 PM   #1
audioPT is offline audioPT  Portugal
diyAudio Member
Join Date: Aug 2002
Location: Right here
Default Digital preamp


I'm wondering to make this:

- 2 analogue inputs followed by CS5396-KS and CS8404A to make a ADC at 24bit/96kHz;
- 4 coaxial digital inputs;
- 2 optical inputs;
- Digital filter;
- Digital switcher;
- 1 coaxial digital output;
- 1 optical output;
- 1 analogue stereo audio output using Cristal components and a famous TDA.

All this in a nice aluminium chassis, like the Chord.

Now, the problems are right here:

- I've received the samples and some of them are SMD. How can I Convert them into normal DIL?
- What can I use to make the digital input shitch?

The volume control will be a PGA2310PA (and a PIC, of course!).

Thanks in advance for some advices (don't tell me not to do this!!)

Pedro Martins
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Old 21st April 2003, 07:33 PM   #2
sayang001 is offline sayang001  Netherlands
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Join Date: Mar 2003
Location: Amsterdam
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Old 21st April 2003, 07:44 PM   #3
audioPT is offline audioPT  Portugal
diyAudio Member
Join Date: Aug 2002
Location: Right here
Many thanks for the link...

Translation, please!!

I've emailed them for a contact.

Nice adaptors

Pedro Martins
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Old 23rd April 2003, 08:19 AM   #4
machinow is offline machinow  Bulgaria
diyAudio Member
Join Date: Dec 2002
Location: Bulgaria, Sofia
Lightbulb Digital Pre-amp

Why not use the original SMDevices directly?? After all, these are some state-of-the-art devices, and not using a dedicated PCB may degrade "System Performance"

Can u make such? Or here the problem is?
I thought about a closer design, therefore I'm writing this, but I prefer the downstated cofiguration:
- CS5394 or CS5396 ADC with several Analog inputs, relay switched.
- some 5-8 digital inputs /TOSLINK and COAX/
- 3 SPDIF receivers and digital switches / multiplexers
- at least 6 ch of DACs, 2 of them state-of-the-art sigma-deltas from AD, TI, AKM, Crystal - 2 for stereo, rest for surround;
- bass re-direction - analog - trough the front's
- Digital Volume Control, maybe with a relay-driven ext. 10-20dB attenuator
- microcontroller and display
- maybe SRC
This enables Surround Sound D to A conversion, using for example 6ch SPDIF outputs on some Creative Live 5.1 / Audigy card. A DSP can also be added.
My Problems : I can not program DSP's yet, also I can't do Micro's; But it's not that hard and it will be AN UPGRADEABLE Pre-amp
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