Adafruit
Adjustable breadboard power supply kit [v1.0]
Build your own breadboard-friendly adjustable power supply with this soldering kit. Based on the MIC2941 low-dropout regulator, it provides a guaranteed 1.25...
Build your own breadboard-friendly adjustable power supply with this soldering kit. Based on the MIC2941 low-dropout regulator, it provides a guaranteed 1.25A output with only 40–400 mV dropout — far better than the LM317's typical 1.25–2.0V. This means you can generate 3.3V from as low as 3.7V input (three AAs or a lithium-ion battery).
The kit includes all components and a PCB, ready to assemble in about 30–45 minutes with basic soldering skills. An output selection switch lets you quickly choose between 3.3V, 5V, or a continuously adjustable voltage via the onboard potentiometer.
Key Features
- MIC2941 Low-Dropout Regulator – 1.25A guaranteed output with only 40–400 mV dropout
- 3 Output Modes – Switch between 3.3V, 5V, or adjustable (1.25V to input voltage minus 0.5V, 20V max)
- Onboard Potentiometer – Fine-tune the adjustable output voltage
- Short Circuit & Overheating Protection – Built-in safety features
- Input Protection Diode – Guards against negative voltages or AC power supplies
- Dual Input Options – 2.1 mm DC jack and screw terminal connector
- Dual Indicator LEDs – Visual feedback for high and low voltages
- On/Off Switch – Power control for the entire board
- Heat Sink Included – Keeps the regulator cool under load
Ideal For
- Powering breadboard circuits at 3.3V or 5V
- Projects requiring adjustable voltage from battery or DC supply
- Beginner-friendly soldering practice
- Workbench power supply for prototyping
Package Contents
- 1× PCB and all components (unassembled soldering kit)
- 1× Heat sink
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- PCB
- A printed circuit board is a rigid board with copper tracks that connect electronic parts without loose wires. For this kit, the PCBs also form the airplane shape, so they are both the circuit base and part of the finished model.
- potentiometer
- A variable resistor usually turned with a knob or shaft to create an adjustable electrical signal. It is often used for inputs such as volume, brightness or position, so it helps beginners learn how a microcontroller reads changing values.
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Brands
Power & Batteries
Prototyping & Wiring
Related Tutorials
Free guides on learn.littlebird.com.au
