Breadboard Power Supply 5V/3.3V – SparkFun PRT-00114
This breadboard power supply kit takes power from a DC wall wart and outputs a selectable 5V or 3.3V regulated voltage. The 2.54mm (0.1″) headers are mounted on the bottom of the PCB for simple insertion into a breadboard. Pins labeled VCC and GND plug directly into the power lines. The lone pair of pins have no electrical connection but help support the PCB.
There are two pins available within the barrel jack footprint. Any stripped +/- DC supply can be connected instead of the barrel connector. Board has both an On/Off switch and a voltage select switch (3.3V/5V).
Comes as a bag of parts kit and is easily assembled if you can follow the silkscreen indicators and have beginning experience with a soldering iron. You will need to read the resistor bands or use a multimeter to determine the resistor sizes.
- Length: 31.8mm (1.25″)
- Width: 31.8mm (1.25″)
Kit Bill of Materials:
- DC Barrel Connector
- Voltage Regulator (LM317 1.5A max current)
- 2pcs SPDT Slide Switch
- 4pcs 0.1″ Header Pins
- 100uF 25V Capacitor
- 10uF 25V Capacitor
- PTC resettable fuse
- 0.1uF 50V Capacitor
- Resistors: 330 Ohm 1/6W – Orange, Orange, Brown X2
- 390 Ohm 1/6W – Orange, White, Brown X1
- 240 Ohm Resistor 1/6W – Red, Yellow, Brown X1
- Red Super-bright LED
- 1N4004 Reverse Protection Diode
- Bare PCB
Power Supply Schematic:
Getting Started with Breadboard Power Supply Kit:
Also, we recommend a Multimeter for testing after assembly.
The parts are soldered in the locations below ensuring that polarized components are fitted in the correct orientation:
After it’s all soldered, it’s time to plug it into the breadboard. Line up the VCC and GND header pins with the power rails on the breadboard. The other two header pins should fit into the breadboard as well as shown in the first photo. These two extra pins are only there for physical support and don’t have any electrical connection on the PCB.
Once connected to your DC supply, selecting which voltage you want via one of the switches and using the other switch to turn it on. The red LED should light up. Careful, it’s bright. Double-check each voltage setting with a multimeter to make sure the proper voltage is being applied to the breadboard (3.3V or 5V depending on the switch settings).