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Silver Mica for Crystal?
Silver Mica for Crystal?
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Old 7th November 2017, 01:31 AM   #1
dj_holmes is offline dj_holmes  United Kingdom
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Default Silver Mica for Crystal?

I have read a few forums stating that silver mica made a big difference to clock performance! Is this true does anyone has experience in this that they can share please?
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Old 7th November 2017, 02:14 AM   #2
rayma is offline rayma  United States
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Quote:
Originally Posted by dj_holmes View Post
I have read a few forums stating that silver mica made a big difference to clock performance!
They have low inductance and losses, are stable and accurate, and are good for high frequencies.
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Old 7th November 2017, 02:54 AM   #3
Tiido is offline Tiido  Estonia
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I would imagine surface mounted NP0/C0G is going to be better, simply because of the smaller physical size (less proximity to unrelated things, less chance of any interferences which might cause changes in timing, plus even lower inductances).
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Old 7th November 2017, 11:15 AM   #4
Henderson is offline Henderson
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PEN smd capacitor (but if the inductance matter in serie ?) = better behavior than Ceramic Class 1 ?


Silvred Mican in smd package (choice in frequency above few hundred pF ?)


bulk polystyren capacitor ?
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Old 7th November 2017, 11:25 AM   #5
DF96 is offline DF96  England
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There are no magic bullets in oscillator design.
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Old 7th November 2017, 11:29 AM   #6
Henderson is offline Henderson
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what is the best bullet cap for it ? List of looked for behavior in a cap for oscilator design ?
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Old 7th November 2017, 01:58 PM   #7
DF96 is offline DF96  England
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Stability. Linearity.
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Old 7th November 2017, 04:07 PM   #8
Henderson is offline Henderson
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Thanks,


So PEN dielectric should be better than ceramic for NPO/COG : flater and higher linearity !


But Better than silver Mica ?
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Old 7th November 2017, 07:34 PM   #9
DF96 is offline DF96  England
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I seem to recall reading somewhere that silver mica caps can sometimes suffer from small random step changes in capacitance, which can be noticeable (but only just!) when used in an LC VFO. The effect would be much smaller in a crystal oscillator so perhaps no problem for audio. I don't know.
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Old 7th November 2017, 08:48 PM   #10
dj_holmes is offline dj_holmes  United Kingdom
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Thanks for all the input!

Rayma that's exactly what I read about silver mica. So it made sense since it has excellent frequency abilities it some how has a better effect on the crystal and made it sound better. Someone actually posted that it was as good as a clock mod by up to 50-60% the quality! And a lot cheaper and simpler

I am not confident in doing clock mods but caps yes I can do. Now the question is some caps used are not bipolar for clocks but I guess can be bypassed with silver mica?!?

I have a Teac Pd-h500i (currently not working) that uses electrolytic capacitors that I thought about bypassing but is the value of the cap important.

I don't know anything about clocks or the required caps or even type of cap. I just trying to get some professional advice / tried and tested opinion of the best caps to use.

thanks
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