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  1. CDRIVE

    This Is What's Really Needed!

    CC, your post is timely. I just came home from my watering hole where I was talking to my buddy about this topic. He mentioned DK too. Strange, I've done business with DK for two decades but was unaware of this filter. Duh! Thanks! Chris
  2. CDRIVE

    This Is What's Really Needed!

    Yes, it's easy enough to google a component part and dig up the data sheet for it. What we don't have and what's really needed is a search engine that searches for user defined specs. For instance, suppose you needed an PNP switching transistor that required the following. Enter Type: PNP...
  3. CDRIVE

    MOSFET IRF540A circuit.

    You haven't given me this yet. I need this information to properly select Z1. If you don't know then measure the output voltage of the Puck (your existing circuit) when you have both LEDs ON and wired in series. Z1 is a safety clamp that insures a load on the Puck's output while the Picaxe is...
  4. CDRIVE

    MOSFET IRF540A circuit.

    Justin, please post the LED model you're using. If you know what the forward voltage drop is post that too. It'll save me time digging out the data. It's late over here now so I'm going to hit the sack, but I wanted to post this schematic for you to ponder while I sleep. As you can see I used...
  5. CDRIVE

    MOSFET IRF540A circuit.

    Yes, but I've repeated myself to the point of core melt down. I enjoy the pub scene also so I'll let you sleep and read back over ALL of today's posts when your head is clear. Below are the three single puck configurations listed in the 2009 Applications pdf. The Buck/Boost Driver configuration...
  6. CDRIVE

    MOSFET IRF540A circuit.

    I'm not referring to the schematic he drew. See my last post.
  7. CDRIVE

    MOSFET IRF540A circuit.

    Justin, did your doppleganger post this? https://www.electronicspoint.com/attachments/4673d1340353497-mosfet-irf540a-circuit-toot.jpg You posted it here... https://www.electronicspoint.com/mosfet-irf540a-circuit-t249238p3.html#post1474507
  8. CDRIVE

    MOSFET IRF540A circuit.

    If you're tying the LED anode to the + Output and the cathode back to the + Input, then yes. I assume you're using this configuration because it gives the widest Vin range. The puck doesn't have to be configured this way but that's what you posted in that jpg you copied from the pdf. Chris
  9. CDRIVE

    MOSFET IRF540A circuit.

    That's not how Justin has the puck configured. It's configured as I show it.
  10. CDRIVE

    MOSFET IRF540A circuit.

    I think you missed my last post. Scroll up. Chris
  11. CDRIVE

    MOSFET IRF540A circuit.

    Never mind I sleuthed it out. The FET circuit you & CC posted are assuming the LED's cathode being pulled to GND, If you're going to use the uPuck as you've shown it in that jpg then I don't see how you can do it differently than I show here. As you can see you'll need 2 pucks.
  12. CDRIVE

    MOSFET IRF540A circuit.

    Justin, please post the data sheet link or model number of the buck converter. I want to read the whole data sheet. Chris
  13. CDRIVE

    MOSFET IRF540A circuit.

    I just saw this. I wasn't refering to current draw when in Sleep, Nap or Hibernate modes. I had already dismissed those functions as not being applicable. ;) Chris
  14. CDRIVE

    MOSFET IRF540A circuit.

    While digging through my old files I came across this circuit that I designed for reasons unknown. I changed the load & Vcc to reflect Justin's high current LED and 7V buck supply. It's not a solution to Justin's problem but it's interesting non the less. The attachment describes a discrete...
  15. CDRIVE

    MOSFET IRF540A circuit.

    Hibernate, is only available on 28X1 and 40X1 parts. Chris
  16. CDRIVE

    MOSFET IRF540A circuit.

    Justin, first off, those are JFETs, which are not suitable for this. Among other JFET characteristics that make them unsuitable they're primarily an analog device. Secondly, you have the LEDs & FETs wired in series, which will never produce the results you want. I can draw a Picaxe schematic...
  17. CDRIVE

    Reverse the voltage?

    Yes, I would have written it as .01uF but my software formats <1uF as nF. I prefer uF & pF. ;)
  18. CDRIVE

    MOSFET IRF540A circuit.

    You stated earlier that your LED supply was 7V and your LEDs drew 300mA total. Has this changed? Also, I didn't say abandon the AXE for a 4017. It would definitely require additional debounce circuitry that the Axe wouldn't. That said, we're talking about a small cap and resistor. What does...
  19. CDRIVE

    MOSFET IRF540A circuit.

    If you have any trouble putting the AXE to sleep (I doubt you will) you could consider using the ubiquitous CD4017. Very versatile and draws very little current. It can easily step through OFF - LED1 ON - LED2 ON - LED1 & 2 ON - OFF. Chris
  20. CDRIVE

    MOSFET IRF540A circuit.

    Sometimes..., actually, most times, KISS is preferable. I would imagine a toggle switch is easy to find on your head. ;) Chris
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