# Adjustable Breadboard Power Supply Kit

## Overview

![](https://cdn-learn.adafruit.com/assets/assets/000/004/747/medium800/adafruit_products_bbpsup_LRG.jpg?1396816130)

This project details the design of a very low dropout adjustable power supply. A good power supply is essential to electronic projects. While there are many existing designs for adjustable power supplies, this one makes improvements that make it more useful for hobby designs.

- MIC2941 regulator has guaranteed 1.25A output
- Low dropout, only 40mV - 400mV compared to 1.25V - 2.0V for LM317. This means you can use a wider range of output voltages including generating 3.3V from as low as 3.7V (such as 3 AA's or a lithium ion battery)!
- Short circuit and overheating protection
- Input diode to protect circuitry from negative voltages or AC power supplies.
- 2.1mm DC jack and terminal connector for voltage inputs
- Two indicator LEDs for high and low voltages
- Output selection switch to select from **3.3v,**  **5v** and **Adjustable**
- Onboard potentiometer for adjusting voltage from 1.25V up to within 0.5V of the input voltage. (20V max)
- On/Off switch for entire board
- Heat sink included

- [Next Page](https://learn.adafruit.com/adjustable-breadboard-power-supply-kit/make-it.md)

## Primary Products

### Adjustable breadboard power supply kit

[Adjustable breadboard power supply kit](https://www.adafruit.com/product/184)
This kit is for making your own breadboard-friendly very low dropout adjustable power supply. A good power supply is essential to electronic projects. While there are many existing designs for adjustable power supplies, this one makes improvements that make it more useful for hobby...

In Stock
[Buy Now](https://www.adafruit.com/product/184)
[Related Guides to the Product](https://learn.adafruit.com/products/184/guides)

## Featured Products

### Large Premium Solderless Breadboard

[Large Premium Solderless Breadboard](https://www.adafruit.com/product/443)
For really big projects, give yourself some room to work in, with a massive 2250-point breadboard - equivalent in size to three full-sized breadboards side by side.  
  
The breadboards are mounted onto a metal plate and comes with 4 colored posts you can use with a bench-top supply....

In Stock
[Buy Now](https://www.adafruit.com/product/443)
[Related Guides to the Product](https://learn.adafruit.com/products/443/guides)
### Full Sized Premium Breadboard - 830 Tie Points

[Full Sized Premium Breadboard - 830 Tie Points](https://www.adafruit.com/product/239)
This is a 'full-size' premium quality breadboard, 830 tie points. Good for small and medium projects. It's 2.2" x 7" (5.5 cm x 17 cm) with a standard double-strip in the middle and two power rails on both sides. You can pull the power rails off easily to make the...

In Stock
[Buy Now](https://www.adafruit.com/product/239)
[Related Guides to the Product](https://learn.adafruit.com/products/239/guides)
### Half Sized Premium Breadboard - 400 Tie Points

[Half Sized Premium Breadboard - 400 Tie Points](https://www.adafruit.com/product/64)
This is a cute, half-size breadboard with 400 tie points, good for small projects. It's 3.25" x 2.2" / 8.3cm x 5.5cm with a standard double-strip in the middle and two power rails on both sides. You can pull the power rails off easily to make the breadboard as...

In Stock
[Buy Now](https://www.adafruit.com/product/64)
[Related Guides to the Product](https://learn.adafruit.com/products/64/guides)
### 5V 2A (2000mA) switching power supply - UL Listed

[5V 2A (2000mA) switching power supply - UL Listed](https://www.adafruit.com/product/276)
This is an FCC/CE certified and UL listed power supply. Need a lot of 5V power? This switching supply gives a clean regulated 5V output at up to 2000mA. 110 or 240 input, so it works in any country. The plugs are "US 2-prong" style so you may need a plug adapter, but you can pick one...

In Stock
[Buy Now](https://www.adafruit.com/product/276)
[Related Guides to the Product](https://learn.adafruit.com/products/276/guides)

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