What does 3V3 or 1V8 mean? - Electrical Engineering Stack …
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?
How to correctly power an ESP32-H2 board with a battery
May 10, 2024 · I'd like to power my ESP32-H2-DevKitM-1 board with a 3.7 V, 2000 mAh Li-po battery. For this I think I must use this pin: Battery-3V3 The above picture is from the Pin …
Switching 3.3V with 3.3V signal - Electrical Engineering Stack …
Jul 12, 2024 · The ESP32C3 has a battery input and a regulated 3V3 output, and the DFPlayer takes 3.3V power, so that would seem to be a straightforward way to power the circuit.
Converting universal AC to 3.3 V DC @ 0.1 A
Nov 18, 2025 · I would seriously consider plugging in one of those tiny USB chargers for mobile phones, like the HTC chargers, and an LDO to bring the voltage down to 3.3 Volts, if this is a …
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 …
stm32 nucleo 3.3V usage - Electrical Engineering Stack Exchange
May 30, 2025 · When using an STM32 Nucleo powered by a 5V power supply, can I use its 3V3 pin to supply 50mA? Or do I need to use, for instance, a 3.3V linear regulator attached to my …
Powering Components with ESP32 - Electrical Engineering Stack …
Dec 22, 2021 · The 3V3 output is just the output of the LDO on your ESP32 module, you can use it to power your 3V3 sensors, like the TSOP that requires 3V3. You can use the RC filter …
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?
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 …
What's up with the operating voltages 5 V, 3.3 V, 2.5 V, 1.8 V, etc.?
Integrated circuits seem to have standard voltages of 5 V, 3.3 V, 2.5 V, 1.8 V, etc. Who decides these voltages? Why do smaller devices require lower voltages?