usb - Is voltage selector on 5v or 3.3v? - Electrical Engineering
![](https://i.ibb.co/mtX0xjY/image0-1.jpg)
I bought this USB to TTL converter and it came with the option to switch between 5v and 3.3v. I want to use it at 3.3v, but I'm not sure where the (grounder?) should be placed? Thanks, see image be
![](https://i.stack.imgur.com/JfgOD.png)
Simultaneous power supply from battery and USB - Electrical Engineering Stack Exchange
![](https://m.media-amazon.com/images/I/617ZTslPovL._AC_UF1000,1000_QL80_.jpg)
5V/3V Power Module, Stable Practical 3.3V Power Supply, With Usb Port 5pcs Switchable Voltage for Power Supply Dc Output Pins : : Electronics
![](https://i.stack.imgur.com/q0a7l.jpg)
mosfet - Input selection circuitry for USB/battery - Electrical Engineering Stack Exchange
![](https://i.stack.imgur.com/5Qon0.png)
dc dc converter - Is there any drawback to directly combining two DC outputs of same (similar) voltage? - Electrical Engineering Stack Exchange
![](http://www.cnx-software.com/wp-content/uploads/2015/04/USBminiPower.jpg)
USBminiPower USB Power Supply Delivers 3 Outputs: 5V, 3.3V, and a Variable Output up to 14.3V (Crowdfunding) - CNX Software
![](https://cdn.cnx-software.com/wp-content/uploads/2015/04/USBminiPower_5V.jpg?lossy=0&strip=none)
USBminiPower USB Power Supply Delivers 3 Outputs: 5V, 3.3V, and a Variable Output up to 14.3V (Crowdfunding) - CNX Software
![](https://content.instructables.com/FR1/D0VO/HMVJB169/FR1D0VOHMVJB169.jpg?auto=webp&fit=bounds&frame=1&height=1024&width=1024auto=webp&frame=1&height=150)
Switchable Dual-Voltage (3.3v/5v) Hacduino : 10 Steps - Instructables
![](http://static.righto.com/images/Chargers/chargers.png)
A dozen USB chargers in the lab: Apple is very good, but not quite the best
![](https://img.kwcdn.com/product/1e13cb94d64/6780a4a5-609e-4ac8-9e5b-51afa2434e76_800x800.jpeg?imageMogr2/auto-orient%7CimageView2/2/w/800/q/70/format/webp)
12v 3.3v 3.7v 4.2v 5v 6v 7.5v 9v Step Converter 12 - Temu
![](https://preview.redd.it/rlrb86cvwjg81.png?width=800&format=png&auto=webp&s=f1dc04ff995fb014ec986a0e0f3b1a96dfba84f2)
Optimal way to convert USB 5v to 2 AAA batteries 3V : r/AskElectronics
![](https://ae01.alicdn.com/kf/H5a853ce2924a47abbc0968fc05f7edf0M.jpg_640x640Q90.jpg_.webp)
IOT Automation Engineering Low Voltage Power Supply 0-5V / 0-3.3v Output Ceramic Pressure Sensor Transmitter - AliExpress
![](https://i.stack.imgur.com/FTN3y.png)
My take on an automatic source selector between USB and wall supply - Electrical Engineering Stack Exchange
![](https://www.electronics-lab.com/wp-content/uploads/2022/01/008-1.jpg)
Multiple Output Power Source – Dual 10V (+/-10V), 5V DC, 3.3V DC from 9V Battery
![](https://forum.dronebotworkshop.com/wp-content/uploads/wpforo/attachments/2967/2799-FrontPanel.jpg)
An ATX-based power supply – Show & Tell – DroneBot Workshop Forums
![](https://cdn.sparkfun.com//assets/parts/1/3/4/5/2/15096-SparkFun_Serial_Basic_Breakout_-_CH340C_and_USB-C-03.jpg)
voltage - Steal 5v from USB Module in 3v Mode - Electrical Engineering Stack Exchange