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  1. Arouse1973

    Programmable Potentiometer/Resistor For 12V DC Motor

    LOL I can't believe you have a Dewalt one...
  2. Arouse1973

    Programmable Potentiometer/Resistor For 12V DC Motor

    Ok I get it now. So you are looking for a timing increment of 1 ms then. That's not a problem for a PWM circuit. What you are after is an ESC (electronics speed controller) We used to use 1200 Amp versions for our RC 10th scale touring cars. Adam
  3. Arouse1973

    Adding LED lights to Kid Battery powerd Ride-on

    No that's right Martin. Where you thinking of using an LED driver? If you do you will need 3, one for each parallel chain. Or you could look for one that will drive a series string of 6 LEDs. Adam
  4. Arouse1973

    Programmable Potentiometer/Resistor For 12V DC Motor

    Hi Scotty, the usual way we would modify the power to a motor in this application is with PWM. It is only one car at a time on the track? Or several? Do you have the spec of the motor, with regards to how much current they draw? I don't quite understand what you mean by modify the time down to...
  5. Arouse1973

    Diodes failing after getting really hot. Attached to UPS system.

    What country is the unit installed in? Not near Finland by any chance? Thanks Adam
  6. Arouse1973

    Detecting a change in signal

    I was thinking the same as ak. This might be of interest to you?http://cds.linear.com/docs/en/datasheet/1042fa.pdf Thanks Adam
  7. Arouse1973

    Activate transistor with piezo disc

    Lucky guess :) Adam
  8. Arouse1973

    Activate transistor with piezo disc

    Hello Are you sure you have it connected as drawn? Look at D2 and see if you have that connected as shown in your diagram. Thanks Adam
  9. Arouse1973

    CPU Power Supply Mod

    Wow Dan, that's great. Look how far you have come since you joined. You should be proud of yourself. Adam
  10. Arouse1973

    Hi from NSW Australia

    Hi ya and welcome to EP. Adam
  11. Arouse1973

    LTSPICE how to make a resistance

    No I must admit Steve I am lost too. What are you trying to do? Thanks Adam
  12. Arouse1973

    Transistor bias configuration

    :)
  13. Arouse1973

    Transistor bias configuration

    If you asked somone how something worked would you expect them to lie to you? Or just read something from a book that might be wrong. If everyone thinks that what is writen in a book is right even though its wrong, is that ok? Adam
  14. Arouse1973

    Transistor bias configuration

    If its that boring Laplace then dont get involved, its that simple. Adam
  15. Arouse1973

    Current Mirror question

    Are you asking how a current mirror works. If so which version of mirror. Wilson, wilder or something different? Show us a circuit. Adam
  16. Arouse1973

    Activate transistor with piezo disc

    Well done Chris I missed that bit about the LED. I was marinating the brain at the time, sorry :) Adam
  17. Arouse1973

    Activate transistor with piezo disc

    Yes thus should! Adam
  18. Arouse1973

    Activate transistor with piezo disc

    Yes! Correct.
  19. Arouse1973

    Activate transistor with piezo disc

    Piezos produce low current a high voltage. You may want to try a darlintong configuration with two transistors or a MOSFET. But limit the voltage by using a diode connected from the piezo to the supply. Adam
  20. Arouse1973

    Good book for Electronics

    Not the resistor it wastes energy. The inductor also reduces transient responce. Unless you need any of these for noise purposes it is better to use the output direct with an output capacitor to supply transient current to the load. But it does depend on the application and current profile. Adam
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