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  1. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Yes just what I was thinking apart from I was going to put a couple of small notches in the PCB outline so it would align in the fixture. The pads are only 1.5mm and yes you could use spear head pins to align in the small hole but these are quite fragile. I would go for crown pins personally...
  2. Arouse1973

    Help needed with High Current Voltage Regulator Circuit.

    http://www.farnell.com/datasheets/370056.pdf You want the D version which is two in series. Two of these in series which will be 3 or 4 diodes, depending if you actually need 4 should work. Adam
  3. Arouse1973

    Help needed with High Current Voltage Regulator Circuit.

    Hi Rob, welcome to EP. What is the maximum current you will be drawing from the battery? What is the lower limit for input voltage for the inverter? It may be as easy as a string of series connected power diodes. I am guessing at these large currents you are not after a regulator really but just...
  4. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Hi Jeff Does this look like what you are after? The PCB is 14mm in diameter with a rear pad of 11 mm and a ring of 1 mm. The round 1.5 mm pads could be can be used for programming with some kind of bed of nails fixture. I wasn't sure how you plan to program the PICs. Adam
  5. Arouse1973

    Series regulators in parallel

    Hi Rory What LT device were you looking at? I think the small value resistors you are referring to are called ballast resistors and allow for equal current sharing within say 90%. Because the output voltages will be very close unlike the older regulators, you can get away with smaller ballast...
  6. Arouse1973

    Which one has the lower noise level？Wheatstone bridge or direct measurement?

    Hi Colin If we are talking about purely thermal noise then I don't think it is related to the type of resistor only the value. Contact noise or also called current noise and shot noise are dependant on material type and the current in a resistor. The physical size (wattage) will also have a...
  7. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    I had not done any programing for 15 years until now. But I have been using PICs in my designs for 20 years but just not programing them, thats what the software guys do for me at work. It took me a time to get back into it and I have enjoyed every minute. Adam
  8. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Well I guess you would not want to supply more than 5 volts to the PIC? Adam
  9. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Yep that will do Hop. Thanks Adam
  10. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Yep some good points Steve. The diode could be a Bat54A in sot23. The max current will be limitted by the 330R so its quit low. Adam
  11. Arouse1973

    Please let me know your idea about this circuit

    Reduce R1 and R2 to 4.7K. Thanks Adam
  12. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Out of interest why does it have to be so small? Adam
  13. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Ok so we are going to have to go small which makes the choice of capacitor critical. This is doing to be a challenge if hand soldering Adam
  14. Arouse1973

    Hello from San Diego, Ca.

    Hello Gene, welcome to EP, hope you enjoy it here. Adam
  15. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    We may need to look for a smaller diode :) It's a bit tight. I have kept the resistors and capacitor the size they are because I guess you will be soldering them yourself? Adam
  16. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Thanks Adam
  17. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Hi Steve What's the part number for the device (U1) you used? Thanks Adam
  18. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Hi Jeff Do you have a PCB size in mind for the final design, Hop mentioned it being circular. Thanks Adam
  19. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Good idea Steve. But the button is on one of the programming lines, this can cause the programmer to do into current limit mode and fail to program. Not sure what the max capacitance is, but I have tried 0.22uF earlier for debounce and it failed. Thanks Adam
  20. Arouse1973

    Microcontroller controlled by pushbutton for LED flashlight

    Thats it Dan, yes it must have been when I deleted the trace to re-route it. I had refreshed many times but must have missed this one. Thanks Adam
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