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An open source power supply based on the LM317, the voltages are switchable using SW2
Breadboard power supply schematic
Parts List
| Part | Value | Device | Package | Description | |
| C1 | 100uF | CAP_POLPTH1 | CPOL-RADIAL-100UF-25V | Capacitor Polarized | |
| C2 | 10uF | CAP_POLPTH2 | CPOL-RADIAL-10UF-25V | Capacitor Polarized | |
| C3 | 0.1uF | CAPPTH2 | CAP-PTH-SMALL2 | Capacitor | |
| D1 | 1N4001 | DIODEPTH | DIODE-0.4 | Diode | |
| F1 | 500mA | PTCPTH | PTC | Resettable Fuse PTC | |
| J1 | POWER_JACKPTH | POWER_JACKPTH | POWER_JACK_PTH | Power Jack | |
| JP1 | M01PTH | 1X01 | Header 1 | ||
| JP2 | M01PTH | 1X01 | Header 1 | ||
| JP3 | M01PTH | 1X01 | Header 1 | ||
| JP4 | M01PTH | 1X01 | Header 1 | ||
| JP5 | M02PTH | 1X02 | Header 2 | ||
| LED2 | Power | LED5MM | LED5MM | ||
| R1 | 240 | RESISTORPTH1 | AXIAL-0.3 | Resistor | |
| R2 | 390 | RESISTORPTH1 | AXIAL-0.3 | Resistor | |
| R3 | 330 | RESISTORPTH1 | AXIAL-0.3 | Resistor | |
| R4 | 330 | RESISTORPTH1 | AXIAL-0.3 | Resistor | |
| S1 | On/Off | SWITCH-SPSTPTH | SWITCH-SPST | SPST Switch | |
| S2 | Voltage | SWITCH-SPSTPTH | SWITCH-SPST | SPST Switch | |
| U$1 | LOGO-SFESK | LOGO-SFESK | SFE-LOGO-FLAME | Spark Fun Electronics PCB Logo | |
| U1 | LM317 | V_REG_317SINK | TO220-ADJ | Voltage Regulator |
Link
https://github.com/sparkfun/Breadboard_Power_Supply_5V_3.3V