On 6/18/2009 8:35 PM, kd4e wrote:
> Ignoring the hype and the prices - can someone address the
> difference in technology between a big Farad cap and a Hybrid?
I'm assuming that a "big Farad cap" is a colloquial name for an electric
double layer (aka electrochemical) capacitor
<http://en.wikipedia.org/wiki/Electric_double_layer_capacitor>
AFAIK, Hybrid® Capacitors are a product line of Evans Capacitor
(<http://www.evanscap.com>). Hybrid® caps have a lower Equivalent Series
Resistance (RSR) and somewhat better "high frequency" characteristics
than electrochemical caps.
A typical electrochemical capacitor behaves as a capacitor only at
frequencies < 1 Hz
An electrochemical capacitor will help with battery "sag" that occurs
over a timescale of seconds.
However, an electrochemical capacitor will not provide much filtering
for load variations that are happening at audio frequencies (like voice
peaks). To filter out audio peaks you'd want to use a big electrolytic.
73,
Mike K1MK
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