Search results

  1. Minder

    simple control a dc motor via arduino uno ?

    BEMF diode in the event that sudden disconnection of power. Normally a DC motor that is controlled, generates a DC voltage in the same polarity as the supply, and opposes it. If turned off suddenly a BEMF in the opposite polarity can occur which is suppressed by the diode. This is a good link...
  2. Minder

    Wiring/Schematic help with SMC Solid State Auto Switch D-Y7NW

    I checked my inventory and I have a few of these on the shelf, The spec sheet shows voltage range 5v,12v, 24v capability. O.C. NPN output. You can also get them in 2-wire versions for low load apps, Arduino etc. M.
  3. Minder

    Wiring/Schematic help with SMC Solid State Auto Switch D-Y7NW

    SMC make pneumatic devices and that appears to be similar to the SMC switches used to detect an internal pneumatic piston position, the piston requires a magnetic ring and the switch is a form of proximity sensor. M.
  4. Minder

    DC MOTOR QUESTION

    It appears one motor cannot operate independent of the other which is the point I was making, Without wheel slip? To take a leaf out of a full scale Loco. There is a traction motor on each wheel and each has a synchronism via wheel slip detection. Although each traction motor has a different...
  5. Minder

    DC MOTOR QUESTION

    It is never a good idea to mechanically link two motors especially where the differnce in load will vary without the use of electrical synchronization or some kind of electronic gearing in effect, this is not normally done in the motion control world. As to generation, Any DC motor generates a...
  6. Minder

    So, how many "watts" is a 9-volt battery?

    Generally batteries are rating Ah mAH etc. The better known manufacturers usually show the specs. http://ww2.duracell.com/media/en-US/pdf/gtcl/Product_Data_Sheet/NA_DATASHEETS/MN1604_6LR61_US_CT.pdf M.
  7. Minder

    Can changing wire gauge affect EMI certification

    If you want to protect the PLC outputs, ensure you place a BEMF diode across the coils if DC. M.
  8. Minder

    current flow?

  9. Minder

    Can changing wire gauge affect EMI certification

    In NA the ampacity of 20awg is 5amps, I am assuming they are AC solenoids, so Important to use twisted conductors. Also proper grounding and bonding. Is there particular EMI regulations in Oz? I prefer using DC solenoids where possible due to the lower problems and longevity. M.
  10. Minder

    How to Replace a Sliding Door Security Alarm Contact

    Hamlin make some nice compact ones with matching switch and magnet. M.
  11. Minder

    clever vibration motor driver?

    What motor are you using? M.
  12. Minder

    How to find a replacement hall sensor for unknown brand

    The sensitivity of the sensor is based on the required magnetic strength (gauss) at the point of detection (distance), See chart: http://sensing.honeywell.com/honeywell-sensing-ss400-series-product-sheet-009050-3-en.pdf You could always try one with the highest sensitivity. M.
  13. Minder

    How to find a replacement hall sensor for unknown brand

    They come in different sensitivities and also Unipolar, Bipolar and Bipolar latch types. I use the Honeywell SS400 series from Digikey but I'm not sure if they make a SMT version. M.
  14. Minder

    measure current drawn while using pulse width modulator?

    The current waveform does not generally represent the voltage waveform, it is a mean level saw tooth in nature. M.
  15. Minder

    current flow?

    The blame has been placed at the feet of Ben Franklin for the mix up! Also the reason the check valve symbol for the Diode is backwards (electron flow wise). M. .
  16. Minder

    clever vibration motor driver?

    Also one other thing to keep in mind, with PWM control of a motor, the current does not follow the same wave form as the voltage square wave, the resultant current is more of a mean level saw tooth. Mosfet typically have a reverse conduction diode from D to S but they are often fairly slow so...
  17. Minder

    Help with a Float Switch circuit.

    Still not quite clear on what you have, BTW switches should be show how they are physically connected and then either by symbol or notation, mark whether they are N.C. help open, N.O. held closed etc. IOW, they could be wired N.C. Help open when tank at normal level. The LED and alarm should be...
  18. Minder

    Noise resistant microcontroller used in high power inverters for PWM generating

    IR App note M.
  19. Minder

    clever vibration motor driver?

    The original promotion that I received with the PDF/sample from Siliconix is from late 80's . I sort of readily gravitated to Mosfet because of their kinship with tube technology with which I was raised, electronically so to speak. I still have many of the old IR design manuals and use Mosfets...
  20. Minder

    Help with a Float Switch circuit.

    OK, But to analyze the circuit properly the state of the float switches have to be known in the particular part of the process, IOW what condition operates them. M.
Top