F
Fred Bloggs
Guest
John Popelish wrote:
+------|+ \ / \ / \
| | >--+--> / \ / \
| +-|- / | / \ / \
| | | / |
| +--------+
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|
V+ | RT
| +----/\/\--------+
/ | |
R | |
/ | |
\ | | \ |
| +---------|- \ |
| | | >--+
+-------|-----+---|+ / |
| | | | / |
| | | |
/ | | R |
R | +---/\/\---+
/ ---
\ --- CT
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| \10 uf is about as big as I have seen that are easily mounted by their
leads. Digikey has the Panasonic E series available up to 10 uf. And
you can raise the value of the input resistor to the second opamp
quite a bit as long as you use a low bias current opamp. Something up
to 10 meg should be no problem. This is a lot cheaper then
accumulating 220 uf. You can also reduce the voltage swing of the
first opamp by several different means, and reduce the current through
the second stage input resistor to slow the charging.
+------|+ \ / \ / \
| | >--+--> / \ / \
| +-|- / | / \ / \
| | | / |
| +--------+
|
|
V+ | RT
| +----/\/\--------+
/ | |
R | |
/ | |
\ | | \ |
| +---------|- \ |
| | | >--+
+-------|-----+---|+ / |
| | | | / |
| | | |
/ | | R |
R | +---/\/\---+
/ ---
\ --- CT
| |
--------+
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