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SIM800L power supply?

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zip

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Hi all,

I would like to power SIM800L with 4.0V as it is put in hardware documentation.
Power supply is stepdown module 12V to 5V.
I suppose just putting voltage divider wouldn't work good.
Has anyone done something similar?



SIM800L Hardware design guide.
 

xReM1x

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You could use a zener diode or just a regular diode with VF of 1V. just remeber VFxI = diode power wasted. if its more than 1-2W you are going to have some problems.
 

zip

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Thanks for helping out.
What does it mean , I will have problems?
Why is diode better approach then voltage divider?
 

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