Hi all.
Working on a MC ADC board to plug into a custom DSP board (more on that later). Wide input voltage allows the board to be power from LiPo or AA/A battery packs.
So far we have
Mini XLR input
Relay switched impedance /gain selection (G6K-2P-Y DC12)
Cinemag input transformer first stage
OPA1632D second stage
AK5578 in 8:2 PCM or DSD mode (exposed on dip switches)
GXO-3306G/A clock
DC 3.0 to 14.5V input with LTC4365 protection
AD5070 DC-DC with ADP7142, ADP7182 for opamps and LTC3042 regulators for the AKM & clock.
Updates to follow.
Note the input voltage range. ;-)
Working on a MC ADC board to plug into a custom DSP board (more on that later). Wide input voltage allows the board to be power from LiPo or AA/A battery packs.
So far we have
Mini XLR input
Relay switched impedance /gain selection (G6K-2P-Y DC12)
Cinemag input transformer first stage
OPA1632D second stage
AK5578 in 8:2 PCM or DSD mode (exposed on dip switches)
GXO-3306G/A clock
DC 3.0 to 14.5V input with LTC4365 protection
AD5070 DC-DC with ADP7142, ADP7182 for opamps and LTC3042 regulators for the AKM & clock.
Updates to follow.
Note the input voltage range. ;-)
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Interessting oroject!
I use a discrete balanced MC-Input Stage and an external ADC from 10 years ago. Eager to learn how you do the actual analog-to-digital conversion.
R.
I use a discrete balanced MC-Input Stage and an external ADC from 10 years ago. Eager to learn how you do the actual analog-to-digital conversion.
R.
Completely reworked design, much cleaner layout and compact. Time to tidy up the silks. 🙂
Cinemag 3440AHPC first + OPA1632 second stage
Omron G6K-2P-Y & toggle between 150ohm and 37.5ohm taps
AK5578EN in 8:2 summation mode & 5v LT3042 supplies
ADP5070 + ADP7182 + ADP7142 for +/10v supplies
GXO-3306 clock & 3.3v LT3042 supplies
3.2 to 10v input with LTC4365 protection
i2s/DSD output
Cinemag 3440AHPC first + OPA1632 second stage
Omron G6K-2P-Y & toggle between 150ohm and 37.5ohm taps
AK5578EN in 8:2 summation mode & 5v LT3042 supplies
ADP5070 + ADP7182 + ADP7142 for +/10v supplies
GXO-3306 clock & 3.3v LT3042 supplies
3.2 to 10v input with LTC4365 protection
i2s/DSD output
Attachments
Last edited:
Interesting project.
But I can't understand why you opted for mini XLR's instead of RCA's. Wouldn't RCA's be a better option since this is what turntables use?
I'm also interested in the ADC part. I currently use a TC Elctronic audio interface to do the ADC part of my phono preamp.
The coils of a phono cartridge are no different to the coil in a dynamic microphone - they're balanced to start with if you wire them as such. Hence a balanced input via mini xlr. I could change it to a single left/right mini xlr...
Yes, I understand that.
By using RCA's you would wire the transfo's exactly the same way (balanced). But with the added advantage that you use what is standard on turntables.
By using mini XLR's people need to use an adapter from RCA to mini XLR or cut the RCA's and replace them by mini XLR's.
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