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 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 AAs 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 (also has a breakout for the voltage you're powering the board with)
• Onboard potentiometer for adjusting voltage from 1.25V up to within 0.5V of the input voltage. (20V max)
• On/Off switch for the entire board
• Heat sink included

The project kit comes as components to be soldered to the included PCB. It's not a difficult project, about 30-45 minutes with a soldering iron. Even beginners can make it! You'll need a soldering iron, solder, diagonal cutters and a PCB holder such as a helping hand tool. A breadboard and battery clip or DC power supply is not included, you can use any DC power supply with a 2.1mm plug (we have a nice one in the shop).

For design documents, instructions, parts list, etc. Check out the project webpage!

Revision History

• As of August 28th, 2024- This kit now includes a smoother SPDT on/off slide switch.

Specifications

• Dimensions (PCB only): 54mm x 21mm x 1.6mm
• Dimensions (assembled): 54mm x 43mm x 16.6mm
• Weight: 16g

Resources

• Tutorial and Downloads