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Old 25th July 2008, 07:29 PM   #1491
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Quote:
Originally posted by brgds
Thanks. Final check: if I leave existing 8V regulator, and add a new super 5V, all to do is to remove Q902 and supply it's output pad. As the result crucial circuits are supplied with 5V excelent regulator, and only less critical motors' driver with lower quality 8V, and the noises from motors' supply do not influence 5V supply, right?
Yes, but what is excellent and what lower quality is still to be determined

I did not remove Q902, only cut traces, but don't see a reason why removal shouldn't work.
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Old 25th July 2008, 08:39 PM   #1492
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Quote:
Originally posted by JC Fardo
Trying to complete Andy´s question:

Are this regs a good choice
No, low quality opamp is used as error amplifier so performance is no better.
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Old 25th July 2008, 10:30 PM   #1493
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Quote:
Originally posted by aparatusonitus


No, low quality opamp is used as error amplifier so performance is no better.

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Old 26th July 2008, 09:02 AM   #1494
Puffin is offline Puffin  United Kingdom
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I have built a flea supply for the 16.93 crystal that I obtained from Peter Daniel. I have tried to connect it up as in the schematic attached. However the transport is reading the disc and making music even if the flea is turned off. I am also getting a loud buzzing noise.

I assume that I have either got the orientation of the crystal wrong, or that I have to cut the power supply to the point where the crystal was originally attached?

I have attached the crystal as to one leg to the +5v and the other leg to one point on the board. The ground wire from the flea is attached to the other point for the original connection.

http://www.acoustica.org.uk/t/naim/35clockreg.html
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Old 26th July 2008, 11:12 AM   #1495
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Hello Puffin,
Remove original crystal and connect new clock as below...
Attached Images
File Type: jpg clock.jpg (85.7 KB, 1293 views)
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Old 26th July 2008, 11:27 AM   #1496
jonners is offline jonners  United Kingdom
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Puffin

Are you using the crystal in an external clock circuit - such as this one: http://home.quicknet.nl/qn/prive/ra....s/CD_clock.pdf ? If so, then it will work as Audio1st has just shown. But it won't work with an external supply if you have just got the crystal connected directly to the board.
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Old 26th July 2008, 11:48 AM   #1497
Puffin is offline Puffin  United Kingdom
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jonners& Audio1st. Thanks for your replies. I am finding my way here so forgive me if I may not understand. The flea is a regulator to which I have attached the crystal oscillator. The flea is shown in the document I attached previously with a Tent Clock (16.93) attached. It can be used for other applications. I don't know if what I have made would be classed as an external clock circuit or just an external power supply with crystal attached.

I'll post some pics later if it will help.
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Old 26th July 2008, 12:30 PM   #1498
Puffin is offline Puffin  United Kingdom
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Click the image to open in full size.

Hope this helps
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Old 26th July 2008, 12:41 PM   #1499
Puffin is offline Puffin  United Kingdom
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Old 26th July 2008, 12:57 PM   #1500
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Quote:
Originally posted by jonners
Puffin

Are you using the crystal in an external clock circuit - such as this one: http://home.quicknet.nl/qn/prive/ra....s/CD_clock.pdf ? If so, then it will work as Audio1st has just shown. But it won't work with an external supply if you have just got the crystal connected directly to the board.
You have me puzzled here. I'm building a separate clock (KC7) with it's own independent PS.
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