Hi all, got my boards for the mosfet version of the flasher and it works great flashing two PAR16 600ma 12 volt leds as you can see.

Also attached is a short clip of the same breadboard design with two 432 incandescent bulbs, just for comparison, per Stans earlier suggestion.

Rod

 

 

We are never too old to learn something stupid....

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trim.3B661C29-6091-4AA6-9893-1BE5171A9102
trim.571573C3-123F-4395-B6E8-B6A61AEC1B43
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I missed the earlier thread. Where did you get these? I wired up some old Marx warning flashers with some I found. I got one from Circuitron, but I blew one of the transistors on it. I replaced the transistor, but I think it blew again. It had a problem with the LED bulbs I was using. The Circuitron boards were expensive too.

George

Looks Good, Rod. Success! More incentive for me to hurry up and give this a try. 

George, I defer to Rod about the current status here, but I think he will be along to help with more info. 

George S posted:

I missed the earlier thread. Where did you get these? I wired up some old Marx warning flashers with some I found. I got one from Circuitron, but I blew one of the transistors on it. I replaced the transistor, but I think it blew again. It had a problem with the LED bulbs I was using. The Circuitron boards were expensive too.

George

Hi George. Thanks for your interest. As was said, they are a DIY board that I put together and ordered boards using DipTrace. They are the result of a lot of help here on the forum from guys like Stan2004 and gunrunnerjohn, in a topic called Help Needed with a DipTrace circuit, or close to that.

The mosfets that were suggested were the perfect answer to switching more current than a couple of small leds use. Since starting this topic I tried it out with one 2.4 amp automotive bulb, and one 600 ma led bulb, as per the video below. Works well, no difference in flashing speed, and no trace of board or component heating, running at 13vdc. So all is well!  The costs are $7.42 for all domestic parts and only $2 bucks for offshore boards and parts.

If there is interest I can post the Gerbers and the BOM for anyone interested in rolling their own?

Rod

 

We are never too old to learn something stupid....

Video worked when posted separately.

I'm sure there is interest in the gerbers and BOM, just saying.

 P.S.  It is time to replace my iPad, it does some really strange stuff these days, and its IOS can't be updated any longer.

Greg

George S posted:

I missed the earlier thread. Where did you get these? I wired up some old Marx warning flashers with some I found. I got one from Circuitron, but I blew one of the transistors on it. I replaced the transistor, but I think it blew again. 

Earlier thread.

I believe the 15 cent transistors in Rod's board are rated to 49 Amps  which I'm guessing are a tad beefier than what Circuitron uses. 

OK here are the pertinent files including the gerbers and the BOMs for anyone interested in ordering a few of these boards. Have fun!

Rod

We are never too old to learn something stupid....

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