Re: gEDA-user: CR2032 with supercap, was Re: [SOT] suggestion for a SMT switch

[Jason <geda@xxxxxxxxxxxxxx>]

John Doty wrote:
> On Jan 4, 2010, at 9:20 AM, Peter Clifton wrote:
> 
>> You could even be fancy.. and measure the inrush. Place a low-ohms
>> resistor in the ground return (to sense the current), then attach to
>> some kind of transistorised switch. You should be able to trigger an
>> oscilloscope watching the volts across that resistor from the switch
>> drive signal. (Hook up to a square wave generator or something).
> 
> For a motor, the inrush is usually about the same as the stalled  
> current. So just clamp the shaft and measure current. Jason, you say  
> the motor takes 100 mA. Under what load condition is that? (Stall  
> current) > (Normal load) > (Freely spinning).
> 

It's an enclosed vibrating motor for haptic feedback.  So, no shaft to 
clamp.  The 100mA draw is during normal load conditions.  This [1] is 
the motor.

thx,

Jason.

[1] - http://www.precisionmicrodrives.com/product_info.php?products_id=200


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