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Can anyone help me with an schematic for dc-dc boost converter,from 3.5-3,7V to 5V to charge a phone? Answered

Hello everyone !! I need a schematic for boost converter but with basics components,i need to find them in my country and not very much to cost. I need it for charge my phone from another cell battery with 3,7V. Like an portable charger. Please help !!

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danyelo

4 years ago

Thank you so so much. But i have one question as a nobbie:
in this chematic i cant find 2SA616, can i use something else? an equivalent? http://i40.tinypic.com/i4qu03.gif

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danyelodanyelo

Answer 4 years ago

But in this 2 schematic, this one and the first schematic from the header comment what is the maximum mA.
http://i44.tinypic.com/2wgwyt2.jpg

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Josehf Murchisondanyelo

Answer 4 years ago

These are 1 watt 500 ma transistors that will work.

SS9012 – SS9013

2N9012 – 2N9013

2N5086 – 2N5088

2N5087 – 2N5089

You can get the data sheets here:

http://www.maxim4u.com/

Joe

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iceng

4 years ago

Classic inductors huh,

Here you go with a pic of the smallest inductor Ive seen :-)

JT-ed1.JPG13turn-JT.pngJT-ed2.gif
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danyelo

4 years ago

thank you everyone but is not what i need. a classic one with inductors? i want to learn from it too. i`m a beginner and a student !! so...

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danyelo

4 years ago

I`m from romania. I want to make a boost converter from 3,7V to 5V to charge my iphone. i dont have much money so i need i cheap schematic if you know.

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MrRedBeardMrRedBeard

Answer 4 years ago

The schematic is detailed here https://www.sparkfun.com/products/10255

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iceng

4 years ago

Here is probably the most cost effective circuit I know.
Except a joule-thief.

And you could have more money
if you stayed away from girls.

upvert.jpg
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danyelo

4 years ago

i had seen that, but i cant find MAX756, can you give me an equivalent for him?

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steveastroukdanyelo

Answer 4 years ago

It would help if you put your actual country in your profile.