Any suggestions for an ADC? ...

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andyr

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Joined 2003
#1
I'm looking for an ADC which I can put after my phono stage but before a digital source selector (as I have 3 other digital sources). Then the selected digital source goes into a miniDSP active XO.

I bought a Linestreamer+ ... nice device and only a few hundred bucks - but it only works as the front end to a computer. 😡

Can anyone suggest either a DIY ADC kit ... or a commercial unit which doesn't need a computer?


TIA,

Andy
 
#2
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#3
Or build a Beis AD24QS with CS5381 option. It can natively accept a balanced input due to the use of quad op-amps. This unit can be trivially modded to accept +/-12V for power rather than using the onboard negative rail inverter as well.
You can also disable the onboard clock PLL and use your own clock for minimal jitter. (24.976mhz for 96/192khz samplerates)

I plan on using mine with my turntable as well, waiting on a balanced phono stage PCB still.

gTaWmSd.jpg
 
#4
spikestabber said:
Or build a Beis AD24QS with CS5381 option. It can natively accept a balanced input due to the use of quad op-amps. This unit can be trivially modded to accept +/-12V for power rather than using the onboard negative rail inverter as well.
You can also disable the onboard clock PLL and use your own clock for minimal jitter. (24.976mhz for 96/192khz samplerates)
Click to expand...

Thanks. Does the AD24QS accept 'normal' unbalanced RCA inputs / outputs? (None of my equipment is balanced.)


Andy
 
#8
Fio said:
Is there an external DAC or do you use the internal DAC (1701)?
If you are using the internal DAC, don't waste your money on high-end ADC.
Click to expand...

I have 4 sources:
* vinyl
* CDP
* DAB+ tuner, and
* satellite TV box.

The first one is analogue, the others all digital. Currently, all 4 sources plug into my preamp ... the output from this preamp will go into my miniDSP. So the 3x digital sources have had an unnecessary digital to analogue conversion before they get to the miniDSP unit.

So I was thinking of:
* using an ADC to digitise my vinyl source
* getting a digital source selector, and
* removing my preamp.

Hence the need for an ADC.


Andy
 
#9
The miniDSP will only accept audio data at 48kHz/24Bit/I2S and there is no ASRC!
If you like to use it as a slave, you will need a clock distribution network to synchronize the DSP, otherwise you need an external ASRC.
I don't know if the miniDIGI is still available?

But what I tried to say, the DAC performance of miniDSP isn't that great.
Maybe it is easier/cheaper and in the end a better sounding solution to look for a device that fits your needs.
 
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#10
PCM4222 EVM for an example could act as master, and miniDSP has a jumper setting for master/slave mode, MCLK is pin9 on Expansion Connector #2 which you can also use to input other I2S data and sync signals. I can't comment on miniDSP DAC quality but ADAU1701 (another board) has got pretty decent DAC's (whether the PCB implementation is bad is other thing).

There is also the CS4272 codec board on miniDSP catalog:

https://minidsp.com/products/opendrc-series/an-fp

That would be a cheap A/D plus a better stereo DAC, though requires I2C configuration (microcontroller). There is also the DA-FP, Curryman DAC and miniDAC8 if you need another DACs.
 
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