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  1. Arouse1973

    Measuring small currents (microamps)

    Show me a drawn circuit please. Adam
  2. Arouse1973

    Voltage from rotation

    No all coils to be side on was what I meant. Then turn the magnets side on. Adam
  3. Arouse1973

    Voltage from rotation

    Keep the same coils you have. Just stick them side on to see if it helps. Then turn the magnets. Use sticky tape for now just to see if it improves. Yes inductance is important as this is linked to number of turns. You get a greater output with more turns for a given magnetic flux. Adam
  4. Arouse1973

    Voltage from rotation

    Yes there is no harm in trying. If this doesn't improve then turn the magnet side on also.:) Thanks Adam
  5. Arouse1973

    Measuring small currents (microamps)

    I would either use an opamp as you have tried or maybe using the A to D of the Arduino. You may have to change the value of the resistors to allow for very small currents. Show us your circuits, we may be able to get it going. Adam
  6. Arouse1973

    fermi level

    Harald you do always impress me. Thats very good. Adam
  7. Arouse1973

    Adjustable Low Current Power Source. Need schematic.

    Yes I have used this circuit many times, you right it makes a good general purpose current source. But the resistor that controls the output current should not be in the current loop. Thats just my opinion. But others seem to think otherwise, why am I not supprised :) Cheers Adam
  8. Arouse1973

    Adjustable Low Current Power Source. Need schematic.

    Yes it called a calibrated multimeter. Adam
  9. Arouse1973

    Voltage from rotation

    Have you thought about turning the coils side on to the magnets? Adam
  10. Arouse1973

    Adjustable Low Current Power Source. Need schematic.

    Yes but the control for current comes from the series resistor which carries load current This is ok for a battery charger but for calibration is it good enough, no I dont think so. Adam
  11. Arouse1973

    Ultrasonic Sensor Help

    Yes used for bat detectors. It can increase it up to 60KHz. But you loose a bit lower down in frequency. Adam
  12. Arouse1973

    Help with LEDs and AC power

    Ok sorry if I sound stupid but what are the relays for. If the circuit is only active when the lights are on why do you need the relays. Is it because the tail light is a single element and will be active when the brake is pressed? Adam
  13. Arouse1973

    Help with LEDs and AC power

    That depends on the voltage of the alternator when on idle. If it's greater than the battery voltage then no. You need to make sure you fit a fully charged battery also. Adam
  14. Arouse1973

    Help with LEDs and AC power

    What is activate the switch, what switch? Adam
  15. Arouse1973

    Help with LEDs and AC power

    Ok I understand. Adam
  16. Arouse1973

    Help with LEDs and AC power

    Why don't you have it charging all the time. So by the end of the day you will have a fully charged battery. Adam
  17. Arouse1973

    Adjustable Low Current Power Source. Need schematic.

    How about this one? http://cds.linear.com/docs/en/datasheet/3092fb.pdf Adam
  18. Arouse1973

    battery charging / testing multimeter question

    No your battery is a lithium battery. The charger you linked to is for Nicd and Nimh. You must not do this. Adam
  19. Arouse1973

    problem programming pics

    At work Bob. Thought you were a man of leasure. If not tell the wife to cut down on handbags lol. Adam
  20. Arouse1973

    ARM Architecture

    What do you mean? Adam
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