Archive for the ‘Flashers and attention getters’ Category:

2013-11-26 Button Cell Runs Flasher For 26 Days

Last month, on Oct 23, I connected a fresh LR44 button cell up to one of my two transistor flashers.  It ran up until Nov 18 for a total of 26 days.  That’s about 624 hours.  Assuming that the LR44 has about 150 maH capacity, then the flasher is drawing about a quarter of a

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2013-11-22 LEDs Power JT FLasher – Continued Experimenting

I added a 1 Farad capacitor to the Xee2 flasher circuit I blogged.  I left the 10000 microfarad capacitor connected, but this is only 1 percent of the 1 Farad capacitor so it really doesn’t make any difference.  I used my LED task light to illuminate the 4 LEDs and charge the capacitors.  I connected

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2013-11-20 LEDs Power TE Flasher, Not JT Flasher

My recent two blogs on powering a flasher with four red LEDs used a flasher made by modifying a Joule Thief.  It works fine, but it requires a toroid core and wire; the flasher I blogged earlier does not require any inductor.  It is a switched capacitor or charge pump,. and it works okay with

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2013-11-12 LED Powers Joule Thief Flasher – More Info

In my earlier blog, yesterday I discussed using a 1 Farad capacitor to hold enough charge to run the flasher for several hours, from dusk to midnight or later.  I checked Mouser’s parts and found a 1F 2.5V capacitor from Bussman for about 2 dollars in single unit quantities.  Kind of expensive but cheaper in

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2013-11-11 LED As Solar Cell Powers Joule Thief Flasher

I’ve seen a lot of Xee2’s xee2vids on Youtube, but I don’t remember seeing this one before.  It’s dated Sept 2011, so it’s more than 2 years old.  The Joule Thief flasher obtains its power from four red LEDs connected in parallel, which are used as solar cells and charge a 10 thousand uF capacitor. 

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