What does 3V3 or 1V8 mean? - Electrical Engineering Stack Exchange
Mar 14, 2012 · While reading a datasheet for an IC I came across the pin voltages being presented as 3V3 or 1V8. What does this representation stand for?
Circuit for 12V relay with an optocoupler using 3V3 GPIO
Feb 4, 2022 · I am trying to design a circuit to control a G6S-2 12V relay that powers on/off a 12V device using a GPIO from an ESP32-WROVER and one PC817 optocoupler. This is the circuit that I have …
Getting a 3V3-tolerant logic high from a 5V bus with an LED
Jan 21, 2026 · Any simple/clean involving the least amount of components (tight space constraints) solutions to redesign the board such that this status pin also triggers a 3V3-tolerant interrupt? LE: …
pcb - How should I connect pins of the same type (ex: VCC_3V3) in a ...
Jan 1, 2026 · Here is the link to the schematics by the way: Schematics Link There are various instances of pins labeled CHIP_PU or VCC_3V3. How should I connect these pins to each other? …
arduino - Driving 5V powered relay module from 3V3 powered ...
Jul 21, 2020 · What I'm trying to do This question is about the use of any 3V3 supply microcontroller to drive 5V powered relay modules which are available from many suppliers. I have provided details …
Raspberry Pi Pico 3.3V_EN pin control voltage inquiry
Jun 22, 2021 · The Raspberry Pi Pico seems to have a 3.3V_EN pin which is basically the 3.3V regulator enable pin (3V3_EN) pulled up to 5V through a 100K resistor internally. I am confused how …
Resistor requirement for 3.3 V supply - Electrical Engineering Stack ...
Oct 28, 2022 · Can I safely power a LED with 3.3 V without a resistor? I have some LEDs that I typically power with 5 V and a 220 Ω resistor, but I can only supply 3.3 V at the moment. Additionally, I have …
How to switch "best" between two voltage sources (5V & 3V3) for a ...
Apr 6, 2021 · How to switch best between two voltage sources (5V & 3V3) for a "load" (e.g. a sensor in the application field or Arduino/Raspberry Pi/etc.). The basic setup is as follows: there are two …
How to connect these +3.3V power pins/labels?
Feb 27, 2023 · I'm just starting with KiCad, using version 7.0.0. This test circuit: fails ERC with these errors: It seems that two +3.3V labels do not refer to the same connection. How do I fix it?
Bidirectional 5 V to 3.3 V level shifter
Oct 6, 2022 · How do I interface 3.3 V Input/Output to 5 V Output/Input? I need it primarily for an Arduino Due but any general purpose bidirectional circuit (or IC) would work. Some people advised me to use …