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...
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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.
- DC
- DC means direct current, where electricity flows in one constant direction, as supplied by batteries, USB ports and many plug-pack power supplies. When a product specifies DC, it runs from a DC supply rather than mains AC, so you need to provide the correct voltage and polarity.
- PCB
- A printed circuit board (PCB) is a board, usually rigid, with etched copper tracks that connect electronic components together without loose wiring. Components are mounted on the board and signals route between them through the copper layout.
- 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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Power & Batteries
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Related Tutorials
Free guides on learn.littlebird.com.au
