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Capacitors in series.

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crutschow

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0.22µF is series with 0.33µF will give a capacitance of 0.132µF, if that's close enough for you.

The LM306p is a comparator and the LM358N is an op amp.

For certain applications an op amp can be used as a comparator, but only if a slow response time is acceptable.

But a comparator can not generally be used as an op amp unless a compensation network is added.
 

TechUser

New Member
Thanks for everyones replies. I'm trying to build a heart monitor and wanted to keep the parts cost way down with what I have. It needed a 0.1µF capacitor at 10V. So I figured a 0.132µF capacitance from a series of .22 and .33 will do just fine. I am confused about the resistor ratings for. How would you know to use a 1/4 watt vs 1/2 watt? If I was only to apply a 4.5V supply?
 

crutschow

Well-Known Member
Most Helpful Member
I am confused about the resistor ratings for. How would you know to use a 1/4 watt vs 1/2 watt? If I was only to apply a 4.5V supply?
The resistor power is V²/R or I²R.

With 4.5V across the resistor, for example, a 1/4 watt resistor would be OK down to a resistance of 81Ω.
 
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