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Silver Mica for Crystal?
Silver Mica for Crystal?
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Old 7th November 2017, 09:42 PM   #11
jcx is offline jcx  United States
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PEN was only resorted to for a smt soldering compatible Mylar substitute

it has higher TC than NP0/C0G by an order of magnitude, MHz DF way worse too

the only place I'd use PEN caps near a oscillator would be DC blocking or PS bypass
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Old 9th November 2017, 10:41 PM   #12
dj_holmes is offline dj_holmes  United Kingdom
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What is a PEN cap? has no one tried silver mica or going to try it? Or does it have to polarised for crystals?
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Old 9th November 2017, 11:24 PM   #13
Henderson is offline Henderson
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Default Siver Mica is OK

PEN is a dielectric : WIMA SMD-PEN Capacitors with Polyethylene-Naphthalate Dielectric which has few capacitance changes at highs frequencies VS some others dielectric as ceramic class I like X7R for instance: its capacitance curve stays flat at higher frequencies than many dielectric but Silver Mica and C0G/NP0. (jcx member's inputt at the post above)


Conclusion of this thread is you can both use for HF signal path Silver Mica cap or Ceramic class I cap (a.k.a: C0G/NP0).


Silver Mica is maybe more consistant (aging) in time & less fragile, but I'm even not sure of that ! I Just readed the datasheets.


regards
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Old 10th November 2017, 12:38 AM   #14
phase is offline phase  United States
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Wouldn’t a solid polymer be better for power supply to an oscillator?
Or a network of C ferrite C R?
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Old 10th November 2017, 10:06 AM   #15
Henderson is offline Henderson
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To prevent oscillation you meant?


OP should ask perhaps about the purpose of the cap in his circuit...
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Old 10th November 2017, 10:47 AM   #16
DF96 is offline DF96  England
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Mention of silver mica in connection with oscillators causes me to assume that the OP is asking about the low value caps connected to the crystal, not supply rail decoupling etc. However, he hasn't said.
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Old 11th November 2017, 08:02 PM   #17
dj_holmes is offline dj_holmes  United Kingdom
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Basically most crystals have 2 caps connected to it. Not Power caps. For example look at pics of my broken Teac cd player 500i. it has electrolytic caps. front is 47 middle 0.1 and back 47 how could this I use silver mica? Can only polarised caps be used?
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Old 11th November 2017, 09:36 PM   #18
Henderson is offline Henderson
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C354 & C353 are not the caps you asked for ?
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Old 12th November 2017, 08:33 PM   #19
DF96 is offline DF96  England
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Electrolytics used as supply rail decouplers may require some ESR to dampen resonances. If so, they cannot be replaced by 'better' film caps. I can think of no good reason to replace an electrolytic with a silver mica cap (or vice versa).
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Old 12th November 2017, 09:04 PM   #20
cbdb is offline cbdb  Canada
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Excuse my ignorance, what do these caps do? At first I thought they were replacing the crystal, but that dosnt make sense. Anyone lead me to a schematic?
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