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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

 

 

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trim.3B661C29-6091-4AA6-9893-1BE5171A9102
trim.571573C3-123F-4395-B6E8-B6A61AEC1B43
Last edited by Rod Stewart
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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

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

 

Last edited by Rod Stewart
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

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Last edited by Rod Stewart

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