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You are here: Home / Mail Archive / How to easily get the voltage you need?

How to easily get the voltage you need?

January 6, 2015 By Øyvind Nydal Dahl 2 Comments

 

Circuit with light bulb and battery

This is a common question….

QUESTION: “Oyvind, I need 5 volts for my circuit. How can I get 5 volts from my 9V battery?”

OYVIND: “Good question. The common way to do this, is to use a voltage regulator. It’s a component that takes one input voltage and gives a different output voltage. And it’s very easy to use.”

Usually you can see exactly how to use the voltage regulator you’ve chosen, by looking in the datasheet.

It’s a component that consists of several basic components like transistors and such to make it behave the way it does.

And you can use more than one in a circuit if you want. For example if you have a circuit that needs both 5V and 3.3V, and you want to power it with a 9V battery. Then you can use one 5V regulator and one 3.3V regulator.

I use regulators all the time. They are very useful.

If you want to get started building circuits, check out my eBook «Getting Started With Electronics»:

https://www.build-electronic-circuits.com/products/getting-started-with-electronics

Keep on Soldering!
Oyvind

Filed Under: Mail Archive

Reader Interactions

Comments


  1. Teslafan says

    May 16, 2020

    Can’t we use a resistor in place of voltage regulators as Resistor also reduces voltage..?

    Reply

    • admin says

      May 16, 2020

      Since the voltage drop across a resistor is determined by the current through it, that would only work if you want to power a circuit that always pulls the exact current you chose the resistor value for. But very few circuits behaves like that.

      Reply

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