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ezDAC v.1.5 Builders Thread
ezDAC v.1.5 Builders Thread
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Old 21st January 2013, 06:06 PM   #361
stonedowner is offline stonedowner  United Kingdom
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Haven't fiddled with my EZDac for a while, but was looking at the circuit designs the other day. The way I have it configured is as designed but using a balanced transmitter board to take the output to a balanced pre amp. Seems a bit convoluted to take the balanced current output of the PCM1798, convert it to a single ended signal then convert it back to a balanced signal. Anyone think of a better way to do this? Audio Note use transformers in their kit for the I/V circuitry but they only have a single ended output from their AD1865 DAC. Is there a similar solution for the balanced output of the PCM1798?
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Old 21st January 2013, 07:43 PM   #362
6h5c is offline 6h5c  Netherlands
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That's a bit too complex indeed, especially since the DAC already has balanced outputs.

If you leave the I/V resistors R23 and R24 in place and add another inverting opamp, you have a balanced output right there. Just ground the + input and split it by removing R26 and R27 and duplicate the circuit.

You could use a transformer with dual secondaries, and ground the center tap, then you'll have a balanced output as well.
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Old 22nd January 2013, 10:59 AM   #363
stonedowner is offline stonedowner  United Kingdom
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Something like this :-Balanced Output.pdf
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Old 22nd January 2013, 01:02 PM   #364
paulb is offline paulb  Canada
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No, you have positive feedback - you have + and - inputs reversed on the lower op amp.
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Old 22nd January 2013, 01:30 PM   #365
stonedowner is offline stonedowner  United Kingdom
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oops. This then? :- Balanced Output.pdf
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Old 22nd January 2013, 04:25 PM   #366
stonedowner is offline stonedowner  United Kingdom
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R25 & R26 would be 100R and R28 and R34 would be 2k0. I was thinking of using LME49720-HA for the op amps.
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Old 14th March 2013, 04:31 PM   #367
merlin2069er is offline merlin2069er  Canada
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What bitrate does the ezdac handle? I'm looking at getting a new usb to spif transport.

Can it do 24/96k or larger?
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