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From: bill@videovax.tv.Tek.com (William K. McFadden)
Newsgroups: sci.electronics
Subject: Re: "Super" capacitors == Batteries?
Message-ID: <5443@videovax.tv.Tek.com>
Date: 8 Jun 89 21:04:24 GMT
References: <1428@ndmath.UUCP> <11170011@hpfcdj.HP.COM>
Reply-To: bill@videovax.tv.tek.com.UUCP (William K. McFadden)
Organization: Tektronix TV Measurement Systems, Beaverton OR
Lines: 13

In article <11170011@hpfcdj.HP.COM> myers@hpfcdj.HP.COM (Bob Myers) writes:
->Now, to get a feel for what kind of "battery" a 1F, 5V cap is, let's make
->the following assumptions: first, the "LED blinker" requires at least 4.5
->volts, and consumes a constant 25 mA regardless of the voltage (a 

In the Linear Databook Vol. 3 from National Semiconductor is a circuit using
a 3909 LED flasher that draws 0.32 mA and continues to run down to 1.15 volts.
You'd probably get a lot more life out of your 1F "battery" using this circuit.
-- 
Bill McFadden    Tektronix, Inc.  P.O. Box 500  MS 58-639  Beaverton, OR  97077
UUCP: bill@videovax.Tek.com,  {hplabs,uw-beaver,decvax}!tektronix!videovax!bill
GTE: (503) 627-6920         "The biggest difference between developing a missle
component and a toy is the 'cost constraint.'" -- John Anderson, Engineer, TI