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  1. Arouse1973

    New but asking for help with MC / PWM ?

    Hi Steve, welcome to EP. Yep micro-controller would be the simplest. What current do you need to supply to this motor? What voltage does the motor require? Adam
  2. Arouse1973

    Calculating Magnitude of two identical charges (Coulomb's Law)

    Because you know the two charges are the same, how about this? Adam
  3. Arouse1973

    Opamp vs Comparator

    You can also get comparators with push-pull outputs. Adam
  4. Arouse1973

    Finding the smallest possible actuator, or a new solution. Help massively needed!

    Its like an egg.
  5. Arouse1973

    Very basic and simple help required for circuit to mod a coffee machine

    No no no....other ways to do it.
  6. Arouse1973

    Calculating Magnitude of two identical charges (Coulomb's Law)

    Messy, god you wana see my desk. :)
  7. Arouse1973

    Calculating Magnitude of two identical charges (Coulomb's Law)

    I have to go out now, for roast dinner :). One of the other guys will be along to help. Cheers Adam
  8. Arouse1973

    Calculating Magnitude of two identical charges (Coulomb's Law)

    He you go. Edit: This only proves the formula, it doesn't tell you how to get the answer :) Adam
  9. Arouse1973

    Finding the smallest possible actuator, or a new solution. Help massively needed!

    You could machine a small cam and use muscle wire to move the cam and create lift? Adam
  10. Arouse1973

    Very basic and simple help required for circuit to mod a coffee machine

    Ok so options are, buy a ready made mono-stable module and use a wall wart power supply. Or build something yourself...your choice Adam
  11. Arouse1973

    Very basic and simple help required for circuit to mod a coffee machine

    Hello and welcome to EP. This is quite straight forward but we need to know how much space you have to fit the electronics. Thanks Adam
  12. Arouse1973

    I want to replace a noisy capacitor in a TV

    Thats a resistor! Adam
  13. Arouse1973

    simple Calculator

    Casio makes some good calculators. Which one do you have. I use this one every day.
  14. Arouse1973

    Zener diode as volt dropping resistor??

    Welcome to EP. This is quite dangerous. If you are asking this question then what experience do you have? I am not being hard on you but we need to be cautious when someone asks this sort of question. Adam
  15. Arouse1973

    Stability of voltage regulators

    No I don't have a reference but here is an example. 24 Volts with a rise time of 1 us and wire inductance of 200 nH. The output shows nearly 40 Volts, I know it only for a short amount of time but worse cases can damage capacitors over time. The capacitor can be its own demise.
  16. Arouse1973

    Stability of voltage regulators

    Yes agreed CJ. I was merely sharing another view point of voltage rating of capacitors that can be overlooked. Adam
  17. Arouse1973

    Stability of voltage regulators

    For what it's worth, I personally choose a support capacitor with a working voltage at least 50% higher than required. It does depend also on the circuit and load. You might need to go even higher than 50%. You see it's not just the regulator that can cause issues with cap ratings. Example...
  18. Arouse1973

    Successive approximation ADC

    Yes that is correct. Adam
  19. Arouse1973

    Successive approximation ADC

    I think that's right. Does it make sense? Edit: To be correct it's (2^12) -1 = 1/4095 = 244.200 uV and not 1/4096 = 244.140 uV Adam
  20. Arouse1973

    Successive approximation ADC

    Maybe I should reword it. Every time the register is incremented it adds 244 uV. Let me do a drawing....Hold on a mo.
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