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

[Jason <geda@xxxxxxxxxxxxxx>]

Igor Lopez wrote:
> Jason wrote:
>> Assuming I need to draw 100mA for 1 sec, that's 0.100 Coulombs.  The pic
>> has a minimum operating voltage of 2V.  Worst case, the battery is down
>> to 2.7V, so I want no more than 0.5V drop when the motor runs.  From
>> [2], my capacitor should be 200mF.  Yikes.
> 
> I am assuming we are talking about a DC motor here.
> If the resistance of the windings are in the range of 25 ohm then you are pretty
> well on your calculations since you will operate the motor with a
> constant DC voltage.

Yep, 29 ohm internal resistance.  It pulls 100 mA at 3V DC even when 
hooked up to a power supply.  I thank my lucky stars for that one. :-)

thx,

Jason.


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