Re: Sticking reset

Brooke Clarke

Hi Brian:

The sluggishness of the movement indicates that you are driving the clock with the minimum voltage needed to get the correct current based on the coil resistance.  You will get much snappier performance, i.e. more solid operation if the loop voltage is 5 to 10 times higher which requires the addition of a carbon resistor in order to maintain the correct current.  Technically you are lowering the loop time constant since T = L/R.  For example see this test where a capacitor is charged to a known voltage then applied to the coil through a resistor chosen so that the coil current is the nominal value:

Have Fun,

Brooke Clarke
1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.

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