The Fact About heavy duty safety clocks That No One Is Suggesting

  Utilize a multimeter to examine the resistance between mains pins over the plug - for nearly any clock motor, hope one thing in surplus of 2k ohms for 230V and 1k for 120V motors.  Take a note from the resistance reading, as you'll need it afterwards.

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There are plenty of means to determine the number of turns needed to operate a clock motor at a special voltage from the first structure worth.  The method explained under is good, but may be a tad intricate if taken to extremes (as I did in the description).

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Normally, it's best to think that the supply voltage will probably be somewhat decrease when compared to the measured benefit.  If you think about the figures for the different clocks described, the thing is that the new very low-voltage winding resistance is concerning 11 and 21 ohms.

Within the photo below, the additional items of metal around the coil are for your alarm buzzer.  The buzzer armature bridges the hole in between the two, but is unable to make good contact, so it simply rattles Together with the alternating magnetic industry.

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  Observe that all descriptions in this post believe 16V Procedure.  You have got to adapt the procedure explained to fit the several ability resource do you have to desire to use a thing aside from 16V.

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  At low voltages, the possibility of the internal limited circuit leading to overheating or fireplace danger is nearly zero.  The most achievable voltage across the windings is 16V - enamelled wire will face up to this for good.  The exact same can not be mentioned for incredibly thin wire, with incredibly old enamel, subjected to the total mains voltage.

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6   Alternate Strategy Another method can be used that doesn't require any relationship towards the mains.  You need to here use ten turns of reasonably heavy gauge wire (no less than 1mm diameter, and preferably even bigger).  Your multimeter have to also be capable of looking at incredibly very low AC voltages correctly, generally all around 50-200mV AC.

  The 10-convert technique explained right here is clearly much easier to wind, but demands larger measurement precision.  You could use additional turns if you want, but make sure to retain the resistance to the minimal.