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  1. Minder

    Portable earth test

    When I started out as an Electrician in the UK we all carried one of the screwdriver testers mentioned, for further test we used a low resistance earth test Megger. M.
  2. Minder

    Portable earth test

    IF you simply want to see if earth leakage is present one of the Electricians neon screwdrivers will light at the slightest leakage. I once had one light off a newly laid brick wall where a cable feeding an outside light had been penetrated by a mounting screw. But if a computer has an earth...
  3. Minder

    small motors

    Many of the older Universal motor S.M.'s had a variable resistance foot pedal, check or by pass it to test whether the motor or not. M.
  4. Minder

    Woodwork machine playing up

    Appears to be a 200µf start and 50µf run cap. If common to all motors then the motors also have a start switch, you really need to disconnect the load from the suspect motor in order to spin the shaft to test the start sw. M.
  5. Minder

    Help selecting the correct Diode

    That product appears to be a diode only, no fuse Over rating on the current is no problem for the diode, do you have any other fuse in the circuit prior, looks like you would have to fuse separately? M.
  6. Minder

    Woodwork machine playing up

    Usually if the start capacitor is bad you can give it a hard spin by hand in Either direction and it will run, if it runs in either direction it is a sure sign of capacitor or Cent. sw. M.
  7. Minder

    Convert uneven pulses

    Mainly all hardwired switching, the large stepping selector relay would step/rotate noisily in conjunction with the dial pulses. I have a working one in my shop, it really entertains the grand kids and their pals. M.
  8. Minder

    Help selecting the correct Diode

    +1 the 1N4007 is the first go to for me. Actually the one I linked to in Digikey covers all bases as a Fast switching diode plenty suitable for this purpose.
  9. Minder

    Help selecting the correct Diode

    General purpose diodes have been used successfully as steering diodes for many decades now.! Speed is not required in this application. I have personally used them this way for years. M.
  10. Minder

    Help selecting the correct Diode

    That is a 5 watt diode that should be rated well within the current you are using, You will probably find it barely gets warm. If you are concerned about vibration and durability I would rate a soldered splice high on the list, to say nothing of the neater approach. If worried about spikes...
  11. Minder

    Do NOT do ANY of this! Safety first lol

    Obviously originates from the shallow end of the Gene Pool! M.
  12. Minder

    Help selecting the correct Diode

    $1.75 Digikey http://www.digikey.ca/product-detail/en/stmicroelectronics/STTH5L06RL/497-5231-2-ND/1039809 Can you solder splice it in? inserted in the harness use heat shrink tube to cover M.
  13. Minder

    Is it possible to use a stepper motor without a micro-processor ?

    You also need to check whether the steppers are bi-polar or unipolar which determines the commutation method. M.
  14. Minder

    Convert uneven pulses

    Keep in mind that a pair of N/C contacts that open on count do not have logic level per-se (1 or 0), they can be made either by way by configuration, source from +ve or sink to 0v. M.
  15. Minder

    Convert uneven pulses

    Just to be clear here, the dial contact is ALWAYS closed until the dial is released at a digit, it will then Open contact a number of time equal to the number on the dial, 1 =1pulse - 0 =10 pulses. M.
  16. Minder

    Convert uneven pulses

    Also keep in mind the pulses are generated by an opening contact (negative logic) , IOW all you would need is a pull up resistor on an input and you would count a Hi every time the count contact opens = No. of pulses. The pulse contacts only open when the dial is released. Dial 0 = 10 pulses. M.
  17. Minder

    Convert uneven pulses

    That is what I was implying, could you not use the ON contact to indicate a count was impending and then use it when it closes again to terminate the count? Between the two the logic should be possible with a micro, although I only use Microchip, not Arduino. M.
  18. Minder

    Convert uneven pulses

    Are you sure you don't have them internally as that is very unusual? M.
  19. Minder

    Convert uneven pulses

    I checked the ones I have and they are identical to these except NT made. You may be able to use the (RH) ON contact in the video as an interlock, as soon as you move the dial a fraction, the ON contact opens and does not close until the dial procedure is over, LH dial pulse contacts. There...
  20. Minder

    Convert uneven pulses

    A mechanical dialer only outputs the dialed pulses when the dial is released? Why not use/program the first pulse as a alert input that a series of pulses follow? I have a working one in my shop, I will have to check it. Also...
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