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DIY DAC....is this any good
DIY DAC....is this any good
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Old 29th August 2012, 12:13 PM   #91
marce is offline marce  United Kingdom
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DIY DAC....is this any good
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Old 11th September 2012, 06:48 PM   #92
portreathbeach is offline portreathbeach  United Kingdom
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Update.....

My DIR9001 board arrived today from eBay so I got to work on it. As you can see from the picture, the LED is illuminated so the there is a valid signal being received. When the signal is removed, the LED goes out.

Click the image to open in full size.

Just to test it, I am powering the board from a USB socket on my Mac (the red and blue cables, 5 volts). I am powering my TORX module from the output of the 3.3v regulator. I bent leg 3 of IC2 up and connected a small cable to the leg and one to the pad where it should be soldered too. This is what I will use to enable me to select either S/PDIF or my TOSLINK module. If you short them, the S/PDIF signal will be put through the DIR9001, if they are left open, the output from the TOSLINK module can be connected to the pad, therefore allowing it's signal to go to the DIR9001. This will be relay switched in my final project.

Just need my TAD1543A's to turn up now so I can get some actual audio out of the device.

The soldering wasn't as bad as I thought it would be. When soldering the DIR9001, I stuck the chip down with a piece of tape and put my iron (which currently had solder on it) on a few of the legs against the chip and drew the iron away from the chip. I did bridge a few legs a couple of times, but I used a clean iron and solder sucker to sort it out.
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Old 11th September 2012, 07:32 PM   #93
portreathbeach is offline portreathbeach  United Kingdom
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I would eventually make my own PCB for the DIR9001. I have a question if someone could answer for me please:

The above PCB uses a Quadrupole differential line receiver just after for the S/PDIF input. From looking at the schematic, it is only actually using 1 of the 4 available on the chip. If I were to re-make the board myself, could I use something like this?

TEXAS INSTRUMENTS,UA9637ACP,DIFFERENTIAL LINE RECEIVER, DUAL | eBay

A DIP package is easier for me when making PCBs, I've already found a supplier of a DIR9001 pre-soldered to DIP28 adapter for only $9.

Is there anything I should look out for when choosing a differential line receiver?
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Old 22nd September 2012, 06:08 PM   #94
portreathbeach is offline portreathbeach  United Kingdom
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OK. My TDA1543's turned up today and I built a simple test circuit to use one of them.

I connected the 8v power supply to pins 4 and 5 with a 10uF cap across them.

I connected 2k2 resistors from R-Out to GND and also L-Out to GND and 1K5 from Vref to GND.

Without anything else connected to the input, I am getting 3.6v DC on both right and left outputs? What have I done wrong?
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Old 22nd September 2012, 08:50 PM   #95
portreathbeach is offline portreathbeach  United Kingdom
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OK. I re-read this thread and done a bit more research. I found a simple circuit I will use just to try. I will feed the output into the -ve of an opamp, feed the +ve of the opamp with vRef and connect the output back to +ve input. Similar to the circuit diagram on this page:

AHDAC
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Old 22nd September 2012, 10:14 PM   #96
portreathbeach is offline portreathbeach  United Kingdom
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Right. I tried a simpler option. I used a 2.2uF cap on each output and the sound from just one DAC is pretty impressive.

I then tried the same this with my 8 parallel DACs and the music is very very crackly. So I think I will have to disconnect all the pin 7s as abroxilto said earlier in the thread and connect them all separately to ground.
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Old 22nd September 2012, 11:01 PM   #97
portreathbeach is offline portreathbeach  United Kingdom
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SORTED!

I pulled all the DAC chips out of my 8 chip PCB and tested, no crackling and good sounding music. I put another one in, slight crackling in the music so I adjusted the trimmer for vref and the crackling went. Right then, so I inserted all of the DAC chips again and adjusted the vref trimmer..... What a sweet sound now

Those 1543s do get pretty warm, will have to heat sink them against my case when I get around to building it
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Old 23rd September 2012, 12:31 AM   #98
abraxalito is offline abraxalito  United Kingdom
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Good work - the 2.2uF cap is being used as a coupling cap to isolate the DC bias? You ideally want to set the trimmer to give 4.3VDC on the I/V resistors as the output range is 1.8V to 6.8V. Listening for no crackles though on very loud music is better...
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Old 23rd September 2012, 08:58 AM   #99
portreathbeach is offline portreathbeach  United Kingdom
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Just listening to it again now. Using an AppleTV3 streaming 320kbps music too the reciever board and then feeding my 8xTDA1543 board (with a piece of aluminium angle as a heat sink for now), into my LM4780 amp and then to my home made Derwent frual speakers with CSS EL70 full range drivers. It's sounding very nice indeed. I'll have to see how hot the little buggers get after an hour or so

What differences should I hear when changing the PSCK1 and PSCK0 switches on the receiver board. I can't hear any audible difference, what is the best way to have these set?

Last edited by portreathbeach; 23rd September 2012 at 09:13 AM.
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Old 23rd September 2012, 10:08 AM   #100
portreathbeach is offline portreathbeach  United Kingdom
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What's the hottest the TDA1543 can run. With the piece of aluminium on the 8 of them (with thermal paste between), the aluminium is very warm. It's not hot, as I can hold the back of my hand against it comfortably. Is this temperature OK?
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