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  1. Arouse1973

    input-output equations for Transistor circuit

    Hello To have posted a reasonably complex circuit like this I am wondering why you are asking. Have you not covered non-linear Interference suppression and the Zigzag transfer functions in your course? If you are teaching yourself then I think this is probably a bit complex for you at the moment...
  2. Arouse1973

    voltmeter on bridge rectifier

    Look up one post, you have your answer I think. :) Adam
  3. Arouse1973

    Can 1 Raspberry Pi 2 Run Two Arduino Mega using USB?

    That all depends on how much current the other components draw. The Pi has a poly fuse which trips at 2.2 Amps when powered through the USB connector. You need to workout the current of the other devices and also include what the Pi is drawing if you are using this connector. Adam
  4. Arouse1973

    DC MOTOR QUESTION

    Ok originally I thought the wheels might have been spinning as fast as they would of load. Thinking they might have been losing grip due to a weight imbalance. Now from what you have said I am thinking the motor is being overloaded by weight. Thus the motor is generating as much torque as it...
  5. Arouse1973

    DC MOTOR QUESTION

    When you say slip, do you mean wheel spinning and not gearbox / clutch slipping? How fast do the wheels turn when off load?
  6. Arouse1973

    DC MOTOR QUESTION

    Can we just clarify this Dave? "The motors are connected via gears to 2 axles" Do you have a separate gearbox and motor for each axel? What about a nice picture of the drive train, excuse the pun! Adam
  7. Arouse1973

    DC MOTOR QUESTION

    I thought the motors were on separate gearboxes? I am not sure I quite understand what you mean about the motor becoming a generator and circulating power in the system. Thanks Adam
  8. Arouse1973

    DC MOTOR QUESTION

    I think the slipping motor was getting hot because of friction, something maybe rubbing. When I used to race RC cars the coolest motor was always the one that was able to run out (Spin the fastest). Adam
  9. Arouse1973

    DC MOTOR QUESTION

    The faster the motor rotates the higher the back EMF. This is what reduces the current for an unloaded motor it basically has a lower effective voltage supplied to the coil. It like running the motor at a lower voltage. Thanks Adam
  10. Arouse1973

    DC MOTOR QUESTION

    Hi Dave The motor with the greatest load will draw the most current. Adam
  11. Arouse1973

    Can changing wire gauge affect EMI certification

    AKs right. Depending on the directive your testing to will depend whether a re-test is needed. If it's Radio, military, automotive then yes. If it's generic like 2004/104 which replaced 89/336 here in the UK then due diligence would require at least another DOC or an emission / immunity sweep...
  12. Arouse1973

    How to Replace a Sliding Door Security Alarm Contact

    Yep just look like normal switches, you should be fine. Let us know how you get on! Adam
  13. Arouse1973

    How to Replace a Sliding Door Security Alarm Contact

    If it's just a magnet and reed switch then you won't have to program the alarm. Can you show us a picture of the old and new sensor? Adam
  14. Arouse1973

    Hello, Welcome! (Introduce yourself)

    Hi Iris, welcome to EP. Adam
  15. Arouse1973

    Hello, Welcome! (Introduce yourself)

    Hi Richard Welcome to EP. Adam
  16. Arouse1973

    diode concept question

    This is the current due to an applied electric field across the diode. Drift current is caused by an external electric field (voltage) applied across the junction. Add this to the diffusion current which doesn't need an electric field and you have the total conductor current. Adam
  17. Arouse1973

    Help calculating battery charging rate off Solar

    Yes you are correct. I did it this way and got the same answer. 4*3.4*3.7 = 50.32 Wh. 50.32 Wh / 20 W = 2.516 hours. Remember nothing is 100% efficient so this would be for a perfect system. You do understand that you will need a certain charger also for those cells? Adam
  18. Arouse1973

    diode concept question

    Hello There will be less than 1 mA of current through your diode. Your Amp meter can only display 1 mA min. The voltage across the diode changes with current. Only at a certain current will you get 0.7 Volts. Have a look at the graphs on the datasheet Adam
  19. Arouse1973

    Anyone feel like helping a complete idiot?

    Edy. Advice is free on here. You will also be supprised that some people have designed the circuit and a PCB also for free. :) We enjoy it, thats why we do it, so what do you need? Adam
  20. Arouse1973

    what do i use !!?

    Hello and welcome to EP. How far away will the second PCB be? Does this need to be wireless? What amplitude is the output from the sensor? What information do you want to transmit? Thanks Adam
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