Search results

  1. Minder

    Microcontroller execution time

    If the timer period is reduced and you are using a Interrupt location routine, Then obviously the more often the interrupt is called it will increase the time taken for non-interupt routines to perform their task etc. In some cases, instead of using the interrupt locations is to turn off GIE etc...
  2. Minder

    Slotted optical switch

    The 2n7000 is a logic level fet equivalent to a darlington, Siliconix originally called it a FETlington. Here is the original spec sheet. M.
  3. Minder

    Microcontroller execution time

    Depends what source you are using to run the timer, if the system clock then it will depend on the freq of the clock (Fosc/4) and the pre-scale the timer is set for. You can pre load the timer with any value and then check the over flow after changing timer value. M.
  4. Minder

    Looking for a specific transformer

    Look for a suitable toroidal transformer, they are a cinch to add or remove windings, generally about 1.5/2 turns/volt. M.
  5. Minder

    Tank water level sensor.

    Why would moisture be a problem in a hermetically sealed tube? M.
  6. Minder

    Looking for a specific transformer

    It is usually very easy to modify the secondary by adding turns or removing if needed, if you have a transformer That is close, M.
  7. Minder

    Help, trying to replace a transistor!

    It looks like an old one,Hopefully not the germanium transistor kind, usually there is a number on the transistor With those many times the problem semi can be identified using a can of cold spray/Arctic Air which can bring them back to life momentarily. This is IF it is a semi problem. Two or...
  8. Minder

    Tank water level sensor.

    What is the depth of the tank, a float switch is a simple device and can also be easily constructed, from copper/brass pipe or Sch 40 PVC, just requires a reed switch at the required position in the sealed tube and a circular float material around the pipe that carries a small magnet. M.
  9. Minder

    Reversing Motor Direction With Relays

    When connecting a DC motor directly across the supply, there is high initial current until the motor gathers rpm and provides the generated BEMF. At switch on it is effectively a very low resistance. M.
  10. Minder

    Reversing Motor Direction With Relays

    Did you actually monitor the voltage at each motor for each condition? M.
  11. Minder

    Reversing Motor Direction With Relays

    What are the details of the adapters? How did you hook them up? M
  12. Minder

    Reversing Motor Direction With Relays

    Misread it in haste! M.
  13. Minder

    Reversing Motor Direction With Relays

    Not sure how they pull that off when they say it requires 12vdc but there is a 24vdc relay on it, the input appears to require at least 14ma signla with respect to ground to operate, hard to reverse engineer it from the Pic. Those units will not reverse the motor. Why not use a logic level...
  14. Minder

    Does anyone know what this connector type is called?

    USB micro B I believe. M.
  15. Minder

    Riddle

    I heard that one about 50yrs ago, but it was a meal each.;) Do the math indeed! It's called logical sleight of hand!:rolleyes: M.
  16. Minder

    Limiting the movement of a motor.

    AFAIK RC servo's have a internal pot feedback for position registration. M.
  17. Minder

    Limiting the movement of a motor.

    The only difference is the servo motor will require an encoder of some kind with PID control for precise positioning over limits. The basic stepper move in 1.8° steps. M.
  18. Minder

    How do I replace this pot with 2 knob pots, coarse fine.

    Deja-vu all over again!:rolleyes: M.
  19. Minder

    What is the difference or similarity between these 2 pot circuits?

    The bottom example would be selected if it intended for such as a speed control into a analogue input for example, when intended for VFD or motor controller..Comparitor input etc Ensure you use linear not logarithmic type. M.
  20. Minder

    What is the difference or similarity between these 2 pot circuits?

    The bottom one is the correct one, although I would have expected them to be labeled (fiine/coarse) opposite. M.
Top