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Thread: 5D mag mod w/ fet firing 64458 @ 20.22 V

  1. #1

    Default 5D mag mod w/ fet firing 64458 @ 20.22 V

    5mega socket & reflector , 4.2V cells, fet switch and 64458 bulb.





    This voltage was read across a 64458 bulb.


  2. #2

    Default Re: 5D mag mod w/ fet firing 64458 @ 20.22 V

    WOW! What a great flashlight. Good work!

  3. #3

    Default Re: 5D mag mod w/ fet firing 64458 @ 20.22 V

    Nice!

    Are you using a soft-start circuit on that FET?

    I've got a stealth 6D Mag that I used to run a 64440 IRC off 5x IMR26700, 20.1Vbulb on a fresh charge (now rocking an EFR 15V/150W ellipsoidal MR16, aka Burnageddon, Scourge of Newsprint), and I couldn't get the 64458 to run nice with my lightly-modded stock switch; flashed bulbs on full batteries, and I never got around to NTCing it (and bleeding batteries down was just too much hassle).

  4. #4

    Default Re: 5D mag mod w/ fet firing 64458 @ 20.22 V

    Thanks.

    Even though I started on a C Mag this is pretty much my first complete and what seems to be a pretty reliable light.


    I am using Jimmy's 2 resistor circuit with an NTE 2395.

    So far I have had good luck with the bulbs but I typically give it a little warm-up blip before clicking the mag switch on.

    I have a 6D mag I want to try w/ 6 cells but the 24V 6457 HLX is a bit larger and does not seem to work as well in the FM reflector.

    The only hassle seems to be using the new mag switch. I made a small PC board that slides into place but I could probably come up with a more robust switch contact.

  5. #5

    Default Re: 5D mag mod w/ fet firing 64458 @ 20.22 V

    Wire braid from switch ground to Pc board/Fet drain





    Small PC board used on new style mag switch to activate gate

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