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Old 29th September 2013, 05:14 PM   #11
dmills is offline dmills  United Kingdom
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Not exactly a low noise design, Colpitts for a low noise oscilator without any amplitude limiting?

Buttler or Driscoll with a series mode rock would be better (Much lower phase noise), or possibly something based on Chris Bartram GW4DGUs work on low noise vhf oscilators for microwave comms.

Also hit Wenzels site for some tricks to finesse supply noise issues.

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Old 29th September 2013, 05:51 PM   #12
Ryssen is offline Ryssen  Sweden
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Thanks for the reply,I had a pcb from Kwak laying around,and I have a Hiface EVO USB 2 spdif with external clock input.So I thought I test it and I made a PSU from a 2x12v trafo and a pos/neg lodroputregs.I havent yet tested the clock on EVO (Waiting on a BNC plug)
Where in this chain would the finesse fit in.After the Preregs or after the regulators on the
Kwak board?
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Old 30th September 2013, 04:40 PM   #13
Ryssen is offline Ryssen  Sweden
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I will order some parts for Finesse and test..
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Old 30th September 2013, 05:18 PM   #14
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Do you know the EVO clock frecuency?
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Old 30th September 2013, 05:51 PM   #15
Ryssen is offline Ryssen  Sweden
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It is 24.576Mhz for 48 and 96 and 192Khz.
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Old 30th September 2013, 05:59 PM   #16
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So you can use Kwak clock.
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Old 12th October 2013, 10:32 PM   #17
Ryssen is offline Ryssen  Sweden
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I connected the clock to the Hiface EVO today but the green LED on EVO doesn´t light.
So I messaured the output on the scope and it´s only 2,5v I read that the EVO wants 3,3vpp to work,thats a problem...
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Old 13th October 2013, 10:18 AM   #18
Ryssen is offline Ryssen  Sweden
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Is it possible to excange 2 (one on each side) of the 27k resistors in the regulators with trim resistors and raise the voltage to get higher output voltege?
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Old 13th October 2013, 05:33 PM   #19
Ryssen is offline Ryssen  Sweden
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I got the clock working on the EVO but songs plays in the wrong pitch so I should have used a 22.xxxx x-tal.
I discovered that the signal was 3v before the 47ohm resistor at output but under 2,5v after so I shorted it....
Althow the LED didn´t light on the EVO the files played faster.
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Old 13th October 2013, 07:44 PM   #20
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You need a fundamental mode crystal. Not all 24.576MHz crystals are fundamental.

Last edited by QSerraTico_Tico; 13th October 2013 at 07:46 PM.
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