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

[John Doty <jpd@xxxxxxxxx>]

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).

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd@xxxxxxxxx




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