{"title":"SparkFun Breadboard Power Supply 5V/3.3V","handle":"sparkfun-breadboard-power-supply-5v-3-3v","url":"/products/sparkfun-breadboard-power-supply-5v-3-3v","description":"A through-hole soldering kit that builds into a compact breadboard power supply. It accepts a DC barrel jack input and outputs a selectable 5 V or 3.3 V regulated supply via 0.1\" (2.54 mm) header pins that plug directly into breadboard power rails.\n\nThe board features an on/off switch, a 3.3 V / 5 V selector switch, reverse polarity protection, a PTC resettable fuse, and a power LED indicator. Stripped wire can also be connected directly through pads within the barrel jack footprint as an alternative to using a DC adapter.\n\nKey Features\n\n\nSelectable Output – Switch between 5 V and 3.3 V regulated output\n\nLM317 Regulator – Up to 1.5 A maximum current\n\nBreadboard Mounting – 0.1\" header pins on the underside for direct insertion\n\nOn/Off Switch – Convenient power control\n\nProtection – Reverse polarity diode and PTC resettable fuse\n\nSoldering Kit – Comes as a bag of parts with silkscreen-guided assembly\n\n\nSpecifications\n\n\nInput – DC barrel jack (2.1 mm centre positive)\n\nOutput – 5 V or 3.3 V (selectable)\n\nRegulator – LM317 (1.5 A max)\n\nDimensions – 32 × 32 mm\n\n\nPackage Contents\n\n1× Bare PCB with silkscreen indicators\n1× DC barrel connector (2.1 mm centre positive)\n1× LM317 voltage regulator (TO-220)\n1× 1N4004 reverse protection diode\n1× PTC resettable fuse\n1× 100 µF 25 V capacitor\n1× 10 µF 25 V capacitor\n1× 0.1 µF 50 V capacitor\n1× Red power LED\n2× SPDT slide switches\n4× 0.1\" header pins\n2× 330 Ω resistors (⅙ W)\n1× 390 Ω resistor (⅙ W)\n1× 240 Ω resistor (⅙ W)\n\n\n\nNote: This is a soldering kit — assembly required. Basic soldering experience and a multimeter (for identifying resistor values) are recommended.\n\n\nResources\n\nSchematic (PDF)\nGitHub – Design Files\n","vendor":"SparkFun","product_type":"physical","in_stock":false,"options":[],"variants":[{"id":11251,"title":"Default Title","sku":"SF-PRT-00114","price":24.79,"on_sale":false,"in_stock":false,"available_quantity":0,"option1":"Default Title"}]}