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Old 23rd August 2008, 07:14 AM   #1
poynton is offline poynton  United Kingdom
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Default Tube Crystal Clock Oscillator

Hi.

Anyone have a simple circuit for a crystal oscillator using a tube ?

I found this on the web.

http://www.upscaleaudio.com/primalun...tjoebclock.jpg

Thanks
Andy
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Old 23rd August 2008, 09:01 AM   #2
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http://www.diyhifi.org/forums/viewtopic.php?t=1284
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Old 23rd August 2008, 01:11 PM   #3
poynton is offline poynton  United Kingdom
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Thanks - an interesting thread

Andy
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Old 25th August 2008, 05:32 PM   #4
kevinkr is offline kevinkr  United States
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I think you could refer to an old ham manual and take a look at vacuum tube crystal based colpitts oscillators. These weren't designed necessarily for low phase jitter, but you can employ the same techniques used for low noise SS oscillators. You should choose a relatively high transconductance tube and avoid over driving the crystal. You'll need a good comparator circuit without hysteresis to make your clock waveform. (Take a look at the Kwak clock for ideas.)

I'm not really sure how much this whole approach is worth, but as I have not tried it I can't say much about its actual merits.

Now I am curious..
And possibly I can get my hands on a Wenzel phase noise & jitter measurement set if I try hard enough.

Take a look at the library section on the Wenzel site: http://www.wenzel.com/
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