[time-nuts] GC-1000 Clock Cap Choice?

Brooke Clarke brooke at pacific.net
Wed Jan 19 15:31:43 EST 2011


Hi Magnus:

I've just placed an order for 16 different kinds of caps.
Most of them are either low leakage or low series resistance 
electrolytic types but also a small number of plastic film caps.  Should 
be here in a few days.
Also have replacements for the tone decoder PLL ICs and the Op Amps that 
drive them, but will replace the caps first and see what happens.

Have Fun,

Brooke Clarke
http://www.PRC68.com


Magnus Danielson wrote:
> On 01/16/2011 11:15 PM, Poul-Henning Kamp wrote:
>> In message<4D336A19.40709 at freenet.de>, "Dr. Frank Stellmach" writes:
>>
>>> High cap value Ceramics are available since years, [...]
>>
>> Can you clarify one thing for me: When I studied datasheets for these
>> it looked like they drop 50% of their capacitance at a DC voltage
>> of 10-20V.
>>
>> Doesn't that make them a so-so bargain for power supply bulk 
>> capacitance ?
>>
>
> High dielectric "constant" comes at a high price performance wise. :)
>
> You gain some, you loose some. Temperature performance and linearity.
> It should not come as a surprise if you start to think about what 
> happens on the atomic/molecular level of dielectrics, it's a 
> combination of electrostatics and "mechanical" stress.
>
> Cheers,
> Magnus
>
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