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  1. (*steve*)

    Use a schmitt trigger for turn on / off slowly LEDs with an automatic duty cycle

    Check out the circuit near the bottom of this page
  2. (*steve*)

    Use a schmitt trigger for turn on / off slowly LEDs with an automatic duty cycle

    I would consider using a mosfet in this circuit. It would allow the turn on and turn off to be relatively symmetrical. as it is now, the LEDs are likely to turn off faster than they turn on.
  3. (*steve*)

    Complete electronic virgin!

    a simple system could just use a forward looking radar or sonar. if you detect something within a certain distance you could apply back pressure on the accelerator increasing as the object gets closer. If you look at speed and rate of closure you could even decide to brake or at extremis...
  4. (*steve*)

    Complete electronic virgin!

    one option is a pair of cameras and some image processing to locate the matching items in each. The displacement in the image can be used to calculate an angular separation and knowing the distance between the cameras will give you a distance. A GPS will give your motion vector. Comparing the...
  5. (*steve*)

    PCB alternatives

    I'm not exactly sure what you're asking. one set of alternatives is matrix board, veroboard, breadboards, etc other alternatives are manual drawing of the board, various ways to get the artwork onto a board, and various etching techniques.
  6. (*steve*)

    Location devices

    This is a very tricky problem. And it is also one that comes up a lot.
  7. (*steve*)

    Bridge rectifier melted.

    Yeah, my guess is a lack of heatsinking. Typical failure of a diode (or diodes within a diode bridge) is to short circuit. Assuming power doesn't flow back from the charger this will tend to cause dynamic braking of the generator with the heat generated (mostly) in the generator. edit: If you...
  8. (*steve*)

    Transistor state control

    it may be worth googling "microwave switch IC". This will point you at some of the manufacturers of these chips. The datasheets often have reference designs, and there is often other design help available.
  9. (*steve*)

    Micro wind turbine

    a bridge rectifier would be a good start. however, also check the maximum current for the LED. It's likely to be way less than 1A. Thanks Bob, I wrote the above and failed to post it. Your answer may be better :)
  10. (*steve*)

    Micro wind turbine

    oh, you also need to protect the LEDs from reverse voltage. Are you rectifying the output of your generator?
  11. (*steve*)

    Micro wind turbine

    you need to limit the maximum current which can flow through the LEDs. If they are high power LEDs (1W and above) then you will also need a heat sink to prevent them from getting too hot even at the normal operating current. If you look at our resource on LEDs you will find a simple constant...
  12. (*steve*)

    help repair router adapter

    Unlikely. Do you still have the original? Had it failed?
  13. (*steve*)

    Complete IDIOT to electronics

    No, we're simply trying to find a solution for you. If you want to use these modules correctly you need a constant current driver. you are currently running these at a very low voltage with a very low light output. We have presumed to want to run them at full brightness without destroying...
  14. (*steve*)

    PCB production panel details

    A nother option is to simply request these answers from your supplier
  15. (*steve*)

    Complete IDIOT to electronics

    what is the open circuit voltage of the solar panels? What is their rated voltage and power? It may be possible to connect the LED strips directly to the panel(s).
  16. (*steve*)

    Transistor state control

    There are some specialized chips which can perform this function. The problem is that they are very small and require a very carefully designed PCB. @davenn may be able to offer some pointers if you have the required skills.
  17. (*steve*)

    help repair router adapter

    Those seem fine.
  18. (*steve*)

    90 degree turn servo and controls

    do all the servos need to move at the same time? Or do the need to move independently?
  19. (*steve*)

    Question about capacity/battery

    the risk of using a higher voltage battery and a regulator I'd that the camera will no longer be able to detect that the battery is going flat. This can lead to the battery being over discharged and damaged. I would recommend using a single higher capacity battery of the same voltage.
  20. (*steve*)

    help repair router adapter

    I note that Edd is now suggesting a resistor rather than a bulb, that's ok too :). But if you go back to a bulb, use a lower wattage one.
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