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  1. Arouse1973

    Digital volt meter doesn't like a power supply?

    I think it's 12vdc 12vdc.:D Sorry couldn't resist that. Adam
  2. Arouse1973

    Methods to reduce wall power current?

    The voltage is 115 V a.c rms. This is the same as 115 V d.c for power loss in a resistor so you divide this by the total resistance 115/(0.47+13) to get the current. Then P = I^2*R = 8.85^2*0.47 = 34.25 W Adam
  3. Arouse1973

    Methods to reduce wall power current?

    Your correct the 50 W resistor will still get hot. What size heat sink did you use. I don't have a link to a web page sorry, what do you want to know? Adam
  4. Arouse1973

    Software to control COM or Parallel port pin output

    LPTOUT might work on XP, not sure. Have a look. Adam
  5. Arouse1973

    Controlling power mosfet

    You may need a pull down resistor on the gate to discharge the internal gate capacitor. Show us a circuit diagram. Thanks Adam
  6. Arouse1973

    Methods to reduce wall power current?

    I calculate the power dissipated by the resistor to be approx. 34 W so no wonder your resistor got hot. You will need a 50 W resistor mounted to a large heat sink to have a chance of using this approach. Thanks Adam
  7. Arouse1973

    Piezo to Capacitor

    Yes correct. And you will also have to overcome the voltage that is increasing also. When your output voltage equals the capacitor voltage no more energy can be stored. And then you use the formula above to work out your energy. Adam
  8. Arouse1973

    Piezo to Capacitor

    Hello If 5 mW is 5 mJ / second which is a rate of change of energy from one form to another. Then 5 mW *2 is just 5 mW *2 and not 10 mW. For it to be 10 mW this would need to be 10 mJ / Second. What I think you are referring to is the amount of energy stored in the electric field of a capacitor...
  9. Arouse1973

    Capacitor series codes

    Yes well done, looks like you have your answer. Thanks Adam
  10. Arouse1973

    Capacitor series codes

    The FM series are not recommended for automotive use. The FA series looks like it's discontinued also, but you might be able to match another capacitor. http://industrial.panasonic.com/lecs/www-data/pdf/ABA0000/ABA0000CE72.pdf Let me see if I can find something. Adam
  11. Arouse1973

    Capacitor series codes

    Hi James What value and voltage rating are the caps. Adam
  12. Arouse1973

    Pulse circuit current control

    In theory yes. But you have to make sure you use the correct op-amp that can operate down at low voltage levels on the inputs (Rail to Rail). Also depending on the transistor your using the op-amp needs to be able to supply enough base current also. I also doubt the circuit will be fast enough...
  13. Arouse1973

    Pulse circuit current control

    Hello The circuit is not confusing, it's wrong! Read the previous posts to help you correct this error. Adam
  14. Arouse1973

    hi everybody

    Hi tonny, welcome. Adam
  15. Arouse1973

    Pulse circuit current control

    Hello The input to your opamp is fixed at 9 Volts. This will give you the maximum current all the time. What are you hoping to do with the POT? Also why the two transistors, do you have two Laser diodes? Adam
  16. Arouse1973

    hello

    Welcome to EP Martin. Hope you enjoy it here. Adam
  17. Arouse1973

    Help getting my circuit to work - sound card osciloscope calibrator

    Well done! Glad you got it working. Adam
  18. Arouse1973

    Help getting my circuit to work - sound card osciloscope calibrator

    Hi mate No its the calibrator circuit .I think Adam
  19. Arouse1973

    Help getting my circuit to work - sound card osciloscope calibrator

    Hi Trevor, I think he is referring to the other circuit being an MV. Cheers Adam
  20. Arouse1973

    Help getting my circuit to work - sound card osciloscope calibrator

    Hi Robert I have emailed Steve, the guy who designed this circuit. Hopefully he will be able to help. Have you double checked all the connections? Adam
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