How to adjust Kwak clock?

[Ryssen]

Do I adjust it for Zero volts out?

 

[merlin el mago]

I guess 2K trimmer.

 

[KatieandDad]

It looks as though the pot only allows you to adjust the mark-space ratio.

 

[Ryssen]

only allows you to adjust the mark-space ratio

And what is that?

 

[KatieandDad]

The output waveform will be a square wave, the lower voltage will be -5V (or very close) and the higher voltage +5V.

The mark-space ratio is the difference in time ON (+5v) and time OFF (-5V).

 

[Ryssen]

And how do i adjust that?Voltmeter or scope?

 

[KatieandDad]

You'd need to read the instructions as I have no idea what you are trying to use it for.

But you'd need a 'scope to be able to adjust it.

 

[Ryssen]

Well I have a scope but no instruktions..
I will google and see.

 

[merlin el mago]

Attached Elso instructions.

 

[Ryssen]

Thanks!

 

[dmills]

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.

Regards, Dan.

 

[Ryssen]

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?

 

[Ryssen]

I will order some parts for Finesse and test..

 

[merlin el mago]

Do you know the EVO clock frecuency?

 

[Ryssen]

It is 24.576Mhz for 48 and 96 and 192Khz.

 

[merlin el mago]

So you can use Kwak clock.

 

[Ryssen]

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...

 

[Ryssen]

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?

 

[Ryssen]

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.

 

[QSerraTico_Tico]

You need a fundamental mode crystal. Not all 24.576MHz crystals are fundamental.