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Old 30th July 2012, 12:06 AM   #71
bcmbob is offline bcmbob  United States
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Hi repeet,

No I don't have that yet.I was under the understanding it was an add-on. Is that necessary for USB to function?

I did try the optical input but didn't get any response with the switch in either position.
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Old 30th July 2012, 12:27 AM   #72
repeet is offline repeet  Australia
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Absolutely, that is the USB chip.
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Old 30th July 2012, 12:46 AM   #73
repeet is offline repeet  Australia
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Regarding the crystal, I'm not sure if it matters either although the screen print on the board seems to indicate it does (one corner is square). Mine is mounted with the printing like this.
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Old 30th July 2012, 12:52 AM   #74
kevinkr is offline kevinkr  United States
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Is it a crystal or an oscillator? The package used is common to oscillators I've seen/used and if it is in fact an oscillator the orientation is important as there will be a power, gnd and output pin and usually one open pin - obviously there can be only one correct orientation in such a case.
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Old 30th July 2012, 02:01 AM   #75
repeet is offline repeet  Australia
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Sorry, yes it's an oscillator. Anyway the photo above shows the correct orientation.
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Old 30th July 2012, 05:01 AM   #76
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Here is a photo that shows the square corner of the TCXO and its correct orientation to the lower left in this view.

Click the image to open in full size.
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Old 30th July 2012, 10:47 PM   #77
bcmbob is offline bcmbob  United States
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I have a different brand oscillator but the square corners do match up. This one has four leads and no markings. The second photo shows bottom side connections. Also - there are five pins soldered on the WM8805. Does that correspond to the other builds?

Does the small diode appear to be in the correct orientation? It was difficult to determine and I selected the black end as the mark.
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File Type: jpg Crystal.jpg (172.3 KB, 500 views)
File Type: jpg Crystal 1.jpg (219.4 KB, 493 views)
File Type: jpg Crystal 2.jpg (158.2 KB, 476 views)
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Old 30th July 2012, 11:15 PM   #78
repeet is offline repeet  Australia
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On the circuit diagram pins 22 - 28 of the WM8805 are tied to ground, so that looks ok (however you are only indicating pins 23 - 27). Diode and oscillator look correct.

Last edited by repeet; 30th July 2012 at 11:21 PM.
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Old 31st July 2012, 09:34 PM   #79
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Sorry to hear you are having so much problems with this thing :'(
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Old 31st July 2012, 11:58 PM   #80
bcmbob is offline bcmbob  United States
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repeet,

I can see the 22-28 pins you mention on the diagram, but a close look at the chip shows what appears to be a different pad (blue arrow)

Green = ground.

Still think I should tie it in?
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