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Still need help with highpower LED flasher (555 timer 1w LED)

Discussion in 'LEDs and Optoelectronics' started by The_Sinpy, Dec 30, 2014.

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  1. The_Sinpy


    Aug 17, 2014
    I made this circuit and it works fine. But I want to add on to it and use more LEDs. I'm still having fun time understanding mosfets and current :)
    Anyway can I throw on another set of 3 LEDs in parallel to the other set I already have or will this be to much of a load for the mosfet to handle? If so could I use two mosfets to power each strand of LEDs?

    Power: Automotive 12.5~14.5
    LEDs 1watt LEDs off eBay 3.4~3.6 350mA
    Mosfet: N-Channel IRF510

    Attached Files:

  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    Both your circuits should work.
    The IRF510 is good for 4 A (5.6 A with good cooling). As each series resistor (27 Ω) limits the current per LED string to ~160 mA, you can easily add up to ~25 LED strings to one single MOSFET.
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