John Ackermann N8UR wrote:
Thanks, Tom. That's another excellent point. The long term stability
impact of this cap is worth considering.
Following up on Brian's comment yesterday, I'm investigating sources for
very low leakage caps. If I find some, I'll let the group know, and if
there's a minimum purchase quantity that's reasonable, I may just buy a
bunch and make them available to the group here.
John
----
buehl wrote:
John:
If circuit has an electrolytic, following may influence how/ when you
recalibrate.
Electrolytics change value and leakage with no voltage applied for
long periods. So if the long TC cap has been switched out for months
it will need a long time with "in circuit" to stabilize again. The
electrolytic barrier "forms" as a result of the electric field across it.
Tom Buehl
Given the easy availability of mylar caps in the 1 to 10uf range, I highly
doubt that such an important task would be given over to an electrolytic.
-Chuck
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