Archive for the ‘Flashers and attention getters’ Category:

2019-05-19 No Go Showboat

from FB group regenerative receiver initiative May 22 Henrik Stenstrom I would like to build something hollow state with all sorts of gizmos like in this photo, but all of it would be a no-go showboat, just for looks. I would put Amber or orange LEDs under the tubes to make them look like they’re

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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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