how power nokia 3310 without battery i.e directly with dc supply.

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nikhilele - 24 Mar 2006 12:28 GMT

My problem is how to power nokia 3310 without battery i.e directly with
dc supply of 3.6V or more.
I know battery connection of nokia
A B C D vbat, 74.5k to gnd for li-ion, 25K to 40k thermistor, gnd
I have done this but phone automatically switch off after welcome
screen is complete.

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DaveyB - 26 Mar 2006 22:29 GMT

>My problem is how to power nokia 3310 without battery i.e directly with
>dc supply of 3.6V or more.
>I know battery connection of nokia
>A B C D vbat, 74.5k to gnd for li-ion, 25K to 40k thermistor, gnd
>I have done this but phone automatically switch off after welcome
>screen is complete.

Try putting a high value tant capacitor or electrolytic across vbat and gnd as close to the phone
contacts as possible.

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nikhilele - 27 Mar 2006 06:53 GMT

yes it works with high value capacitor but this also involved high
surge current at startup this can damage regulator having lesser
rating.

I have to use 3300uF capacitor and it works very fine

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