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RPi 3b doesn't boot from sd card. Without sd card, both ethernet light up, even with sd card inserted too. ACT led wont light up. 3.3v rail works. : r/RASPBERRY_PI_PROJECTS
How to make 5V relay work on raspberry pi (hack) - YouTube
Raspberry Pi 3 Pinout
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power - Shorted 3.3v + 5v together. Is it possible to repair? - Raspberry Pi Stack Exchange
General Raspberry Pi I/O pin explanation - Sim Innovations Wiki
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Overview | Raspberry Pi Care and Troubleshooting | Adafruit Learning System
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Raspberry Pi 3 Pinout, Features, Specifications & Datasheet
Raspberry Pi 3.3 V Power Supply
Raspberry Pi Documentation - Raspberry Pi hardware
3.3v line shorted to GND - Raspberry Pi Forums
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No power on pins and disconnected GNDs - Raspberry Pi Forums
Auto Fan Control Module + 3.3V & I2C Breakout for Raspberry Pi | The Pi Hut
3.3V 5V CAN BUS Module Expansion Board HAT for RPI Raspberry Pi PICO W H WH | eBay
3.3V Is Not Enough For This Raspberry Pi Zero | Hackaday
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Raspberry Pi RS485 CAN HAT 3.3V MCP2515 SP3485 SPI Interface Allows Stable Long-Distance Communication for Pi 4B/3B+/3B/Zero
Auto-Fan Control & Crypto Module for Raspberry Pi (with I2C + 3.3V pins) | The Pi Hut
Raspberry Pi Measurement of voltage and current at the 3.3V pin - KaliTut
Raspberry Pi 4 Pins - Complete Practical Guide - The Robotics Back-End
