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Re: About the clock[200/86 (365K kms)] posted by Michael Hale on
Thursday, 3 December 1998, at 2:38 a.m.
I just remembered some of the specs of the new capacitors. They are electrolytic radial lead 16V and 100 microfarads (I'm still a little unsure about the microfarads, but I know the voltage is correct). I think they ran me about 1.50 USD a piece.
Mike
Re: About the clock[200/86 (365K kms)] posted by Don Foster on
Thursday, 3 December 1998, at 12:45 p.m.
Mike --
It's great you have an idea of what's used in the clock!
You can use any capacitor with a voltage rating equal to or greater than the supply voltage. So 12 would work, 16 is safe -- 35 would be fine - 300 would also be fine. The only concern would be physical size (the higher the voltage rating, the larger the can).
The voltage rating only specifies a maximum "do not exceed" value.
With capacitors, it's generally OK to go a little larger in value (and the tolerance is usually +/- 25% anyway). The only place the value is critical is in an oscillator or timing circuit -- and 100 mfd means this is very much NOT a timing circuit (even though this IS a clock). That's a value associated with power supplies.
If my clock needed a 100 mfd, I'd toss in a 200 or even a 300 -- a 50 would probably also work. I have bags of them in my workshop. Size is the only concern. It's critical to install the new cap with proper polarity.