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In Reply to: RE: Musiland Monitor 01 USD - late to the party, but... posted by Thorsten on December 17, 2009 at 10:35:40
Folks,
I located the datasheet for the Output Transformers:
http://ww2.pulseeng.com/products/datasheets/T601.pdf
It is specified to match the ancient Crystal receivers/transmitters and is specified for 7Mbps (that is basically 48KHz sample rate).
This does not seem very good to transmit the four times faster rate at 192KHz.
Indeed, the waveforms I saw seem not too great for 44.1KHz, though still better than some of the show of horrors shown on Lampizators website:
http://lampizator.eu/
(All these are SPDIF output traces from CD-Players/Transports long discontinued at 44.1KHz, so it is possible to do much worse than Musiland)
Ciao T
Follow Ups:
I measured the rise/falls times at 176.4 k. They are almost the same at about 7 nS.
It is not a bad thing sometimes to 'slow' the signal. By adding a little output inductance, I have virtually no overshoot, very little ground bounce, and very clean rise and falls. The sound has also improved.
I am going to use the musiland monitor 01 to add a USB input to my dac. Could yuo please suggest a way to automatically switch the proper input when a USB signal is fed to the musiland?
Regards.
Paul
I looked again at the digital output of the externally powered Musiland 01 usd thru a 75 R BNC connector which replaced the phono socket on the device. There was no sign of the issues you displayed. The signal is very clean, has the classic spdif shape with low time axis spread, and a little ground bounce with the first cycle at about 110 MHz, decaying to about 80 MHz in the 2nd cycle. Te transition edge was clean and the only issue is a degree of noise on the top hat which was cleaned up when I applied a 20 MHz filter. The 50R bnc output that comes as standard was not much different overall, but does sound slightly 'mellower'
Maybe further bypassing of the internal regulators can improve things but this is another story. I don't mess with battery supplies 'cause they are long term nuisances (from experience).
The 'slow' pulse transformer did not appear to be an issue at 176.4k which was what I fed into the device. The waveshape was as good as any other PC device I have seen and is nearly on par with the HiFace. However, the pk-pk volatge was indeed lower than standard.
The set up was:
Vaio usb - 10 cm shielded usb cable with Vbus cut and power injected from 5V alw regulator with 7 uV noise re 1MHz bandwidth - 3 m bnc silversonic 75R cable - 75R termination - Tetronix 2465B scope. The same trace shape was there with a different PC and a 1.5m Illuminati XV2 cable.
The one serious issue I have, is that, having updated the firmware and updated the driver to 1.0.7.0, subsequent reinstall of any software at 1.0.5.0 or above fails as device is then not recognised. The Musiland website is so 'secretive' that I cannot register onto the forum to post the issue. They really need to sort this out if they want world sales growth.
If anyone has resolved the issue, please post. For myself, I have tried the usual tricks and I think it is soemthing that is written onto, or missing from the registry. I do use a reg cleaner and may be this has taken its toll. The reg key from Musiland after re-registration cannot be added just by clicking on it as all I get is 'device not found'.
There is also the issue of transfer among PCs where nothing higher than 1.0.3.2 works, and the posted install instructions do now work either..
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