9 volt to 3 volt circuit help needed

sciford · Post by **sciford** » Thu Jan 16, 2014 9:10 am

I have a simple, 3 volt strobe circuit that uses the old LM3909 component. I put it together years ago. Is there any way I can get this to work on a 9 volt wall wart voltage? Just adding a resistor in the forward 9 volt path doesn't do it. Any information would be greatly appreciated. Thanks

TimeScape · Post by **TimeScape** » Thu Jan 16, 2014 1:16 pm

Voltage regulator...

Check this article out.

http://www.egr.msu.edu/classes/ece480/c ... onNote.pdf

Ant · Post by **Ant** » Thu Jan 16, 2014 1:47 pm

Hey Chris- any reason you don't want to use batteries? The 3909 was specifically for low power drain circuits.... runs great on batteries.

sciford · Post by **sciford** » Thu Jan 16, 2014 4:51 pm

Thanks Timescape for that information.

sciford · Post by **sciford** » Thu Jan 16, 2014 4:55 pm

Hi Ant, yeah, I originally built it to run off 3 battery powered volts...But the rest of the kit I want to run it with of is wired at 9 volts...needed to light the 9 volt led strips. It took me a while and a bit of internet searching but I did manage it in the end this afternoon - I wired 5 LED's in series in front of the flasher unit input. This provides enough resistance to drop the voltage and still keep the strobe effect of the led's intended to be momentarily lit (my current Sith Infiltrator build).
Cheers

Ant · Post by **Ant** » Fri Jan 17, 2014 7:52 am

Ah that makes sense then!

And a creative solution!