connect it to the ground
give a look here: http://t-class.niceboard.net/autocostruzione-f31/ttasformatori-per-dac-e-qualche-misura-t9664.htm
I'll try the LL1690 soon
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Use what the manufacturer suggests. If your preamp has an input impedance near 40kohms then you just need the RC filter they show on the datasheet. If it is much higher, such as 250kohms, then I would use a 47kohm resister across the outputs along with the RC filter.
My preamp has an input impedance of 47K. The manufacturer suggests 40K // 7K+400pf. Ok I'll try this.
Any suggestion for the resistors and caps?
Pietro
I would use silvered mica caps and metal film resistors to insure good performance. The 47kohms input should be close enough for the load part, but a scope would be nice to confirm it. You could always parallel a high value resistor to get closer to 40kohms if you wish, the manufacturer is usually very accurate with their suggestions.
Ok maybe this is a stupid question, but is a DAC like this an improvement compared to an external USB sound card like this:
E-MU Systems - 0202 USB 2.0 - USB 2.0 Audio Interface
Here in an excerpt from the specs:
Analog Line Outputs (2)
So for the line outputs SNR is 112dB and THD is 0.0013%.
How much better are these specs for the DAC discussed on this thread ?
E-MU Systems - 0202 USB 2.0 - USB 2.0 Audio Interface
Here in an excerpt from the specs:
Analog Line Outputs (2)
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Type: Balanced, AC-coupled, 2-pole low-pass differential filter An externally hosted image should be here but it was not working when we last tested it.
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D/A converter: CS4392 An externally hosted image should be here but it was not working when we last tested it.
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Max Level: 6.7 dBV (unbalanced) An externally hosted image should be here but it was not working when we last tested it.
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Frequency Response (20Hz - 20kHz): 0.00/-0.01dB An externally hosted image should be here but it was not working when we last tested it.
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Dynamic Range (1kHz, A-weighted): 111dB An externally hosted image should be here but it was not working when we last tested it.
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Signal-to-Noise Ratio (A-weighted): 112dB An externally hosted image should be here but it was not working when we last tested it.
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THD+N (1kHz at -1dBFS): -98dB (.0013%) An externally hosted image should be here but it was not working when we last tested it.
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Stereo Crosstalk (1kHz at -1dBFS): <-120dBSo for the line outputs SNR is 112dB and THD is 0.0013%.
How much better are these specs for the DAC discussed on this thread ?
The Emu USB is quite superior to the dac's USB, but who knows what it sounds like.
Specs are for Techs, I listen with my ears.
It's supposed to be. Someone just bought one, we haven't heard from him yet.
How are you dealing with volume control?
I am really newbie here.
A preamp, or attenuator, or receiver, or whatever you have. It's just another source, like a tuner or tape deck..
Yes it can, I have 2 LM DAC board, V9 and V10, the receiving chip can choose either DIR9001 or CS8416, the DA chip can use CS4398' CS43122 and PCM 179X series.
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I have LM-DAC3 V9 and V10, the receiving chip are both CS8416, the V9 has designing problem, if you use upsampling board, the maximun sample rate you can received is 24BIT/176.4K, if you pull the upsampling board out, you can receive only 24BIT/96K, and there is nothing you can do, but the V10 is no problem for receiving 24BIT/192K.
Since the V9 DAC can't receive 192K, so I just bought DIR9001 board from LM's dealer in GuangZhou 3 days ago, the receiving chip can be changed very easy.
Just receive DIR9001 board, the sound is much better than CS8416.
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