Archive for the ‘Flashers and attention getters’ Category:

2022-02-19 Blinking LEDs Can Look Like They’re On Steady

Blinking LEDs are usually reset by the voltage dropping to zero then coming back on. So if one LED, probably the fastest one, blinks first, all the rest in the series string will be reset, then comeback on again when the fastest one comes back on. So you have essentially a single blinking LED and

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2017-05-04 Interrupting The Supply V to the Oscillator

I was working on the 27 MHz oscillator for testing the regens, and I thought it would be a good idea to turn the carrier off for a small fraction of a second every 1 or so seconds.  So I built a two transistor flasher with a third transistor to invert the pulses.  Instead of

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2016-08-20 Blue Blinky Gets A Different Timing Capacitor

It has been a long time since I designed Blue Blinky; I just wanted to update it.  I have used a 1 uF electrolytic capacitor for the timing capacitor, and it works just fine with the two 680k resistors to give about 1 per second flash rate. I got a bag of hundreds of multilayer

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2014-09-07 Flasher Battery Dies Early Death

I connected a AA cell to a “Pigeons Nest” flasher more than a year ago, and used it as a trip hazard marker when it’s dark.  The cell was a Kirkland brand from Costco.  This had been running up until the end of August, even though I had noticed some ‘hair’ building up on one

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2014-05-15 RGB Full Multicolor Flashing LEDs

I ordered these from an Amazon seller, Liroyal-led, a few weeks ago in April.  It took that long to ship from Hong Kong.  They are 50 pcs of Bluecell 5mm RGB full multicolor flashing LEDs.  The cost was $3.45 including free shipping. The case is clear epoxy.  I looked down inside and saw four chips

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2013-12-26 High Power LED Flasher – Strobe

This is a continuation of the 2013 Dec 18 blog.  It was getting too long, and so is this blog. Update Dec 24 – I searched for high current pulse gen schematic using Google and I didn’t come up with anything near enough to what I’m looking for.  I saw a lot of high tech

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2013-12-08 Blue Blinky Used As A Remote Control Finder

I got a frigid greetings by email from Kirk, where it’s a bone-chilling -20 deg. F in Winnepeg, CA.   He’s building a similar device to find a misplaced object.  I have a few other Ideas I’d like to go over. The Blue Blinky uses a Joule Thief circuit, which works with any color LED

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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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