Article View: sci.electronics
Article #21710Re: "Super" capacitors == Batteries?
From: William K. McFadden
Date: Thu, 08 Jun 1989 21:04
Date: Thu, 08 Jun 1989 21:04
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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
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Path: arc1-ca.pugleaf.net!utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!uunet!zephyr!tektronix!tekcrl!tekfdi!videovax!bill 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