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From: "Owen Lawrence"
Subject: Re: Flashing LED using LM3909
Date: Mon, 16 Sep 2002 19:54:02 -0400
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The LM3909 was designed for low power operation. I'm betting that any
circuitry you add to save power is probably going to consume more than it
saves. It works by trickle charging the capacitor, and when the cap's
charged enough, it drains the charge all at once, giving enough brief
current to do the job. It's consuming microamps. I've had alkaline C cells
last over two years with these things.
- Owen -
J M Noeding wrote in message <firstname.lastname@example.org>...
>tested the LM3909 with LED from brake-light and surprised by the
>bright lightening sort from the LED. Operates with 2x AA type elements
>with 2200ohm series resistor and two capacitors.
>Wonder if it is worth using a light sensitive resistor to switch it
>off during the day? May have to wait and see how long the battery
>lasts - believe it lasted over a half year last time I used the device
>with an ordinary LED, but it could sometimes be fun to make the object
>difficult to trace in daytime
>Is it some simple devices available for 3V operation for switching it
>off when sun is up? Have been only hobbyist in electronics for some
>time and I am not so much aware of possible devices which are readily
>remove ,xnd to reply
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