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Old 21st July 2008, 02:34 PM   #1461
kevinkr is offline kevinkr  United States
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Quote:
Originally posted by jims
Kanifee

Check out this PDF, put together by algar_emi. Also you can use Peter's document from an early post to make the capacitor changes. I recall seeing a UK distributor of Blackgates when I was searching the web.

Any takers on my question about capacitors for the citizen crystal, a couple of posts up?


JimS

I'm not using any caps in my RCEZ32 based unit with the citizen crystal - no problems so far. My understanding is Peter isn't either.
There is enough capacitance in the chip's oscillator circuitry apparently to obviate the need for external caps.

I used both PK and standard parts in mine, PK where space was an issue and standard everywhere else. Peter I think recommends the FK series.
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Old 21st July 2008, 10:20 PM   #1462
iihay is offline iihay  United Kingdom
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Got my caps, crystal etc from Peter, he sent them over very quickly and made my life easy. Could be the easiest Uk option.

Don't forget blackgate burn in time, I'm yet to hook this up to my DAC (in progress) but have had the transport powered up for ages to cook em a bit.

The PDF was very useful, just be careful with smd caps under the heatsink as indicated. They'll shift with patience.

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Old 22nd July 2008, 02:04 PM   #1463
jims is offline jims  United States
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I noticed an improvement with the citizen crystal. Music seemed smoother (less granularity) and the dynamics seemed stronger, but I am no expert. I used 10pF silver-micas from each leg to ground. Did not try without the caps.

I am thinking about trying an external clock, like Kwak clock. I know that the output of the external clock goes to the XIN pin (61) on the DSP. I guess I am not sure what XOUT is? Also, can't quite figure out from the datasheet what the voltage max and min is for XIN. Any help would be appreciated.


thanks

JimS
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Old 22nd July 2008, 03:17 PM   #1464
kevinkr is offline kevinkr  United States
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Ignore Xout - it is not used with an external clock. Xin should be driven with a 5V clock signal. Use the ground point from the resonator for your local clock ground.
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Old 22nd July 2008, 03:30 PM   #1465
jims is offline jims  United States
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Thanks Kevin,

I realize that XOUT is not necessary with an external clock. I am interested in understanding what XOUT is. I have been reading a lot about crystals and clocks and can't quite figure this out. I think it applies a voltage at a certain resonance to basically start and keep the crystal oscillating. I may be missing something fundamental....

JimS
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Old 22nd July 2008, 03:47 PM   #1466
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Great today my AWSR superregulator arrived...

I can hardly wait....to unpack my present..and listen...
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File Type: jpg superregulator.jpg (49.7 KB, 1563 views)
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Old 22nd July 2008, 04:50 PM   #1467
kevinkr is offline kevinkr  United States
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Quote:
Originally posted by jims
Thanks Kevin,

I realize that XOUT is not necessary with an external clock. I am interested in understanding what XOUT is. I have been reading a lot about crystals and clocks and can't quite figure this out. I think it applies a voltage at a certain resonance to basically start and keep the crystal oscillating. I may be missing something fundamental....

JimS

Xout provides the drive to the crystal which is inside a feedback loop comprising a buffer (non-inverting gate) a few passive components and the crystal.

This app note explains it rather well:

http://www.fairchildsemi.com/an/AN/AN-340.pdf
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Old 22nd July 2008, 08:25 PM   #1468
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Quote:
Originally posted by iihay
Don't forget blackgate burn in time
Iain
How long is it recommended?

Thanks
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Old 23rd July 2008, 01:52 AM   #1469
Pocoyo is offline Pocoyo  Indonesia
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Default BG F 1000uf 35v

Hii

Just to share the BG F 1000uf 35v

For diyer who likes Peters Mods, I have 5 of BGF
I sell this cause can help me build this transport

I sell @ US 50, Paypal receive include std mail cost
(just sell 4pcs of BGF 1000uf 35v)

Please email me if you interested, thank you
regards
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Old 23rd July 2008, 02:26 PM   #1470
flodge is offline flodge  United Kingdom
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Default changed pwr supply

Hello again
Replaced my fried unit with another as the 51 is quite easy to get in the uk.
Great sound, a real upgrade from my modified ld player. Have just put in a much more complex power supply that i have an option to buy of a friend of mine. A board normally used for supplying a cdpro kit. The result is that the sound is now like a bland, ordinary cd player - it really is black magic - most other things make sense when you think about them for a bit, but not audio.
change back
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