Any suggestions for the use of this port for an analog source. I would like to add a turntable to my new Sony DAV-HDZ278 Bravia home theatre system. Problem? No RCA analog s/e inputs for the phono preamp. Only input is the Sony "digital media port". I can only see running outboard phono pre to a A to D converter (I have small tube one) and then running analog output to the only digital input, the "digital media port" Any thoughts on this? Is there an easier solution??
Regards,
Barry
Regards,
Barry
You're in luck. The digital media port is not digital. Well, not the audio part anyway. Straight analog only, no provisions for digital audio on it.
I've attached a small clip from the schematic of a Sony receiver with DMPORT. A had posted this info to another forum quite some time ago.
Note the red lines are +5 VDC, thick black lines are ground (0 VDC), and the rest are various digital or analog signals.
L+ and R+ are audio, and L- and R- are the ground for each.
The RXD, TXD and DET are used for communication between the DMPortaccessory and the receiver. The DMPort accessory will ground the DETline, and the receiver uses this to know that something is connected. That may (or may not) be enough to allow the receiver to switch to the DMPort input. The TXD and RXD are almost certainly just RS232 serial signals, but I know nothing of the baud rate or actual data format.
You may be lucky enough to get the receiver to think a DMPORT accessory is attached simply by grounding the DET line.
I've attached a small clip from the schematic of a Sony receiver with DMPORT. A had posted this info to another forum quite some time ago.
Note the red lines are +5 VDC, thick black lines are ground (0 VDC), and the rest are various digital or analog signals.
L+ and R+ are audio, and L- and R- are the ground for each.
The RXD, TXD and DET are used for communication between the DMPortaccessory and the receiver. The DMPort accessory will ground the DETline, and the receiver uses this to know that something is connected. That may (or may not) be enough to allow the receiver to switch to the DMPort input. The TXD and RXD are almost certainly just RS232 serial signals, but I know nothing of the baud rate or actual data format.
You may be lucky enough to get the receiver to think a DMPORT accessory is attached simply by grounding the DET line.
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Hi macboy,
before I go buying a media port adaptor and ripping it apart can you advise whether this was easy to do?
do you have any pics of your modified adaptor?
Thanks
before I go buying a media port adaptor and ripping it apart can you advise whether this was easy to do?
do you have any pics of your modified adaptor?
Thanks
So, what I did was to buy a DMPort accessory (TDM-NC1 Wi-Fi music player) and use it standalone rather than connected to a DMPort enabled system. I equipped it with RCA connections for audio and video, and a DC input for power (5 VDC). It works well. They only caveat is turning it on and off. In order to turn it on, I have to enter a special "test" mode, which means sticking a pin into a hole in the bottom to press a hidden switch, then pressing Enter on the remote. To turn it off I have to power cycle it. This is a minor annoyance though. Next I will add an S/PDIF output, which shouldn't bee too hard since all the I2S signals are easily available inside. If (when) I get a DMPort enabled receiver, I can start to decode and hack the communications between accessory and receiver. But for now it plays music well. With S/PDIF it will be even better (should be bit-perfect).
Doing this was easy, just an afternoon of work. I just popped it open to find which wire connected to what, then clipped the cord, found the individual wires, soldered some RCA plugs and a DC jack (and power filtering to keep it clean) and I was done. I did have the help of the service manual to know what is going on in the circuit.
Before you ask, the reason I did this was that I found the TDM-NC1 for $40 at a local SonyStyle store. I couldn't pass that up.
Doing this was easy, just an afternoon of work. I just popped it open to find which wire connected to what, then clipped the cord, found the individual wires, soldered some RCA plugs and a DC jack (and power filtering to keep it clean) and I was done. I did have the help of the service manual to know what is going on in the circuit.
Before you ask, the reason I did this was that I found the TDM-NC1 for $40 at a local SonyStyle store. I couldn't pass that up.
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