|[AMRadio] Cap Substitution|
ars.w5omr at gmail.com
Thu Feb 14 22:10:25 EST 2008
JT Croteau wrote:
> I have a circuit that rectifiers power from a 24VAC tranny tap using a
> 1N91 to power a 24VDC relay. It calls for a 50 uF filter cap to
> ground. Can I substitute a 47 uF?
Sure. if you're unsure, use two 47uf caps in parallel... or a pair of
I'm reminded when I asked an instructor about 'why bother to do exact
calculations for resistance and/or capacitance if the manufacturers
don't make, for example, a 54.5kOhm resistor, or a 51uf capacitor?"
He said "Ah, Geoff! Welcome to the wonderful world of Electronics! The
Exacting Science of Approximation!"
Gotta say... he's got a point!
73 = Best Regards
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