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  1. Minder

    choosing micro fo BLDC motor speed control

    Picmicro have a development board and software, the schematic and code can also be seen on the Pic site under MC LV Development board. M.
  2. Minder

    hardware learning

    Check out the μp Tutorials by Nigel Goodwin also available out there in C. M.
  3. Minder

    Not understanding C, DC, & Z flags from my homework?

    ??? All it takes is a PDF download o_O e.g http://www.microchip.com/wwwproducts/en/PIC16F628a The instruction set also gives examples. M.
  4. Minder

    Not understanding C, DC, & Z flags from my homework?

    If you look in almost any Picmicro manual in the Instruction list section for any μp it explains exactly how an instruction affects the C,Z,DC etc. M.
  5. Minder

    Optocoupler

    Then you have no control if and where on the incoming phase where it is going to fire! M.
  6. Minder

    Getting started making PCB with software like Eagle

    I have been caught by DHL ONCE! Almost as bad as US Ebay sellers that use the GSP (Global Shipping Program) by Pitney Bowes and touted by Ebay, many times ridiculous prices, I refuse to buy unless they change it to USPS shipping. M.
  7. Minder

    Repairing tumble dryer: what is this part?

    It is labeled as a thermostat here. http://www.ransomspares.co.uk/diagram/zanussi/tumble-dryers/46429/td160%20(91676000900)/ M.
  8. Minder

    Repairing tumble dryer: what is this part?

    Not really obvious, you need the wiring diag, often it is printed on the back cover. M.
  9. Minder

    Optocoupler

    You don't have any phase control circuitry? M.
  10. Minder

    Repairing tumble dryer: what is this part?

    There is often a over temp thermostat used in case the others fail, the temp should be marked on it, they normally test as N.C. switch. Usually you can get a parts list off the internet from parts suppliers by entering make/model. M.
  11. Minder

    Help with controlling 2 dc motors using microswitches

    IOW 6 function control of 2 axis . M.
  12. Minder

    CNC machine, Shapeoko 2 or 3, or XCarve Kit

    You also might get some F.B. here http://www.cnczone.com/ M.
  13. Minder

    Optocoupler symbol?

    Those are nice drives but a little overkill for a first project, also the controller appears to use step/direction means of control which the Mitsubishi drives may not have, at least I could not see it in the manual, also you need a program to configure the drives up by parameter etc. M.
  14. Minder

    Optocoupler symbol?

    The encoder resolution x4 means that the drive is capable of using all 4 edges of the quadrature signal to increase the basic encoder resolution x4 this way. Are you using this drive for a spindle? the input appears to be 10vdc analogue. M.
  15. Minder

    Why DC motor draws more current with friction?

    Upon switch on an AC induction motor represents a transformer with shorted secondary turns. As the rotor catches up with the rotating stator field, the difference of the induced slip frequency becomes progressively less as the rotor catches up, it can never catch up completely as there would be...
  16. Minder

    Why DC motor draws more current with friction?

    See the tail end of my post #11 See the empirical test I did on a much larger DC motor than the one you are using, rated at 2Hp. Off load it drew 2 amps all the way through the rpm range from 0 to 2000rpm. The only time I saw a large momentary current was if full voltage was applied, it was...
  17. Minder

    Why DC motor draws more current with friction?

    What gauge are you using? 20 gauge is good for 5 amps. It would take well over 10 amps to burn the insulation, M..
  18. Minder

    Optocoupler

    That is a random phase opto couple and has to be synced to the zero cross over, either by logic or RC methods see the app note for both methods. Show your circuit. M.
  19. Minder

    Optocoupler

    That is a random phase control triac driver, not really intended to drive a load directly and meant for control of AC loads. Are you switching the load with the opto? More info needed! Look up Fairchild app note AN-3006. For phase control . M.
  20. Minder

    hardware learning

    You also need decide at some point if you just want to stay with digital/analogue logic etc or micro processor. But for now there is many little projects out there based around the 555 ic, such as a simple PWM DC motor controller, parts can be had off the internet, but I suggest you use someone...
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