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Questions tagged [5v]

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Can I mix 5v power sources? how about 24v power sources?

Hello and thank you in advance for pointing me in the right direction. I finally started designing my own PCBs. If I set up a PCB with a 110 to 5v power source (HLK-PM01), could I then add another 5v ...
Cancun Manny's user avatar
0 votes
1 answer
101 views

ESP32 powered over long lines with 230V

I'm planning to put several Ethernet ESP32s with AMS1117 5 V to 3.3 V power converters and SHT31 temperature sensors around my house to report temperatures. They will be connected over Ethernet; power ...
syster's user avatar
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2 answers
148 views

How to reduce 24V to 0V-5V variable through a pot with an output current of 3amp? [closed]

I want to build a 5v variable PSU. I found one on ebay but the output current is not good for my application, 10mA.
EMed1839's user avatar
-1 votes
1 answer
84 views

5V Relay, triggered with power on/off [closed]

I am new to this forum and came across it trying to find a solution for what I thought would be an easy problem to solve. I work in custom AV installations and I was hoping to find an off-the-shelf ...
digitalav's user avatar
0 votes
1 answer
41 views

5V USB-Power without Battery makes MCP73832T toggle the LED

My schema works as long as the Battery is attached to it. In fact, it even works if I disconnect the Battery - EXCEPT that the LED1 toggles in that case. My intention is to use the circuit either 5V ...
iKK's user avatar
  • 103
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0 answers
87 views

ESP32 (clone) Wemos Mini : 5V on VCC won't boot ... except if USB plugged in

I try to power up an ESP32 Wemos Mini (clone) through the VCC pin ... but it d not boot. Surprisingly, if I connect an USB cable onto the Wemos mini USB connector ( and not connected at the other end, ...
user1803095's user avatar
1 vote
1 answer
66 views

Detecting Bus Presence

I have a PCB that connects to an existing device through a simple parallel bus. I want a way to determine whether this device is connected or not. The data lines aren't of any help, as they are ...
Enrique Cortez's user avatar
3 votes
3 answers
1k views

Using Linear Voltage regulators in parallel for a high current load

I need to build a high current 12 to 5 volt regulator. This will power neopixels, which draw 60mA each, and we have like 800 of them, so around 48A when all of them are on at full brightness and white....
Juan010's user avatar
  • 41
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0 answers
145 views

Can I use a Schottky Diode to prevent a voltage regulator from being used in reverse?

When I use a USB Serial Programmer, the 3.3V line from the programmer gets connected to the 3.3V line from the circuit below. The problem is that I also get 3.3v on the voltage regulator's VIn, ...
rasco22862's user avatar
0 votes
1 answer
67 views

Amount of watts on a phone charger [closed]

I'm building a phone charger, and I'm curious about the output power. We know that a phone battery charge on 5 V, and let's say the overall resistance of the charging circuit in the phone is about 200 ...
Ahmed Ali's user avatar
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0 answers
204 views

Drive an HX-53 IR Transmitter using an ESP32 and logic level converter

I have an ESP32 with which I need to drive an HX-53 IR transmitter. I'm facing some range problems particularly for three reasons: The HX-53 is supposed to be driven with 5 V. There is an LED in ...
user217354's user avatar
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0 answers
149 views

How to connect a 5volt relay to esp32?

Sorry to ask this stupid question here. I have the relay shown below with me. its a 5 volt relay. I wonder can it operate on 3 volts. If so, is it possible to connect it to the esp32 3 volt output. or ...
Savad's user avatar
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1 answer
545 views

Tap power from 3D printer PSU to a Raspberry Pi 4

Would it be possible to power a Raspberry Pi 4 by tapping some power from the PSU of an Elegoo Neptune 3 Plus printer? Since the Raspberry Pi requires 5V to run I understand that I would have to get a ...
Pizzaman321's user avatar
1 vote
1 answer
1k views

Can addressable 5 V LED strips be powered with two differently strong power supplies?

I want to power 16 m of SK6812 RGBWW LED 5 V strips with 60 pixel/m. They are rated with 18 W/m which would make the maximum power ~300 W. I highly doubt that I will ever use the full power so, 200 W ...
PowerStrugle's user avatar
1 vote
3 answers
212 views

Can I connect multiple USB 2.0 females to a MEAN WELL 5V 10A power supply?

I have a 5V 10A power supply and some USB 2.0 female breakout boards. I only need the power and no data. I have six ESP8266 for small Wled lights which uses a maximum of 1.3 amperes per unit. I have ...
Steve's user avatar
  • 11
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3 answers
54 views

IRLML9301PBF as high side switching for 5 V, 2 A load from a 3.3 V uC?

Circuit: simulate this circuit – Schematic created using CircuitLab I would like to cut off the power to my APA102-LED-strip during uC sleep - as the standby current of these strips is relative ...
Stefan Krüger s-light's user avatar
0 votes
1 answer
247 views

5V, 50 Ω input single pulse signal to an FPGA

I have a 5 V, 50 Ω input single pulse signal (<1 ms pulse width) going into Trenz TE0711 (operating @3.3 V and 50 MHz clock). Since the input signal is too high of a voltage, I am trying to find a ...
trident_'s user avatar
2 votes
0 answers
67 views

5 V holdup/ temporary backup circuit

I have a project where I'm using an android tablet to power a serial relay, the relay is 20 m from the tablet so I'm using a USB C > USB A hub and a self powered USB over CAT6 extender. When the ...
Tim's user avatar
  • 21
1 vote
2 answers
2k views

How to power LILYGO ESP32-S3 1.9" T-Display without USB?

Noob question, I'm sure, but - I have one of these little LILYGO ESP32-S3 1.9" T-Display boards. Linked up with my PC, downloaded my code, runs fine, but I can't get the thing to power up from ...
Jinja's user avatar
  • 31
0 votes
1 answer
86 views

I am building a circuit that operates at 5 V but I need to use SIM7600 module @12 V

I am building a circuit with an Arduino that operates at 5 V, but I need to use a SIM7600 module that will be connected to the Arduino's pins, and needs 12 V in order to operate. Will I have any ...
5Volts's user avatar
  • 175
0 votes
3 answers
238 views

What is the maximum current that a 5V barrel plug device will draw if plugged into USB-A?

Here's the situation, I have an alarm clock that is powered by a barrel plug DC connector that says "5V" next to it. Out of the box, it has an AC plug into a figure-8 connector going into a ...
qbccd's user avatar
  • 11
1 vote
1 answer
132 views

Voltage Drop on circuit

I am a relative newbie, so please be kind. This is a working schematic. When I press the buttons, the LEDs light up. So far, so good. now I connect the multimeter to one of the M* pins and measure ...
dessi's user avatar
  • 87
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0 answers
134 views

DHT21 / AM2301 sensor not measuring humidity Arduino

Although there was a similar thread it was for Raspberry PI. This sensor should work out of the box with the Arduino and should be more advanced than the cheap DHT11/22. I have this exact sensor: ...
ddifof's user avatar
  • 1
3 votes
3 answers
2k views

Applying 5 V to 3.3 V output pins

I have a 3.3 V microcontroller pin (not 5 V tolerant) with an external 10 kΩ pull-up resistor. By mistake, the external pull-up resistor was connected to 5 V. As I understand it, the only thing that ...
nikomas's user avatar
  • 67
1 vote
2 answers
521 views

Using MCU as a power switch to PC -- connecting the thing correctly

My LED strip projects are done and completed succesfully for now and I am back with a question regarding powering MCU when using it as a remote PC switch. So what I have so far: a Raspbi Pico W which ...
Niko Alanko's user avatar
0 votes
0 answers
50 views

MOSFET Driven 5V relay doesn't work when connected to two different sources

I built a circuit that uses a 3.3V signal to control an IRLB8721 MOSFET, which in turn switches a common 5V relay. This relay then controls an external 5V powered device. I drew a schematic below. ...
masonjacob's user avatar
0 votes
1 answer
454 views

Do I need an isolation transformer?

I am building a 5V circuit where the maximum current draw I expect will be 5-5.5A, so have purchased a 5V 6A power supply IRM-30-5ST. In order to connect this power supply to the mains, I have ...
Darcy's user avatar
  • 3
-1 votes
2 answers
115 views

5V protection circuits

For my project, I'm using this solar shield in order to use some solar panels and a battery to power my Arduino. In order to protect the solar shield (where the maximum solar input is 6V) I would ...
Safari's user avatar
  • 107
0 votes
0 answers
77 views

Charging board cuts out when unplugging USB cable

I’m using a Lithium battery charge/discharge board with 5V regulator and USB-C input to power a gaming handheld. It’s important that I be able to run the handheld and charge the battery at the same ...
johnnydanger's user avatar
1 vote
1 answer
400 views

Can I directly connect a 5V DC device to the inputs or outputs of a 3.3V microcontroller that tolerate that voltage level?

I'm doing a project with a PIC32 that works with 3.3V and that has some terminals that are tolerant to 5V levels. I need to manage another device that has a UART at TTL voltage levels (5v). The ...
Fabián Romo's user avatar
0 votes
1 answer
159 views

What type of circuit/components are needed to make a phone charger that stops charging when the battery is full?

I'm building my own portable power station, using a 12v lead acid battery as a power source. Currently I've got 1 12v socket and 2 usb ports on it. The idea being to use it to power something like a ...
rohtua's user avatar
  • 103
0 votes
1 answer
595 views

Step down buck converter - lower input voltage than output - LM2596

I want to power 5v leds from a 12v source in my car using a "DC-DC Adjustable Step-down Buck Converter LM2596 3A". The source has a dimmer switch which can regulate the voltage from 12v to 1....
siz's user avatar
  • 1
1 vote
0 answers
62 views

Exchange a battery with capacitor?

I have this 5 V lamp work with a internal-battery. I took the battery out and it work with the 5 V charge directly. But it flash/flick sometime. My idea is to put a capacitor in place of the battery ...
Joseph Tailor's user avatar
1 vote
1 answer
451 views

Charging a 5v battery bank with 4.2 volt battery

So I wanted to make a hand-cranked battery charger for my power bank, and I figured that if I connect a generator to a lithium battery I had lying around, I could use the output of that lithium ...
BumBuilds's user avatar
-1 votes
1 answer
287 views

Using two USB 5V sources to toggle a AC relay for a hibernating computer w/ high phantom load

I have a PC w/ a great processing-to-power-consumption ratio, however its idle consumption and power-off power draw (phantom load) is far from ideal. I could use an external switch to manually toggle ...
abc's user avatar
  • 1
0 votes
1 answer
156 views

Supply power for a relay with same source as pump connected to relay

I would like to know if relay will work normally when I supply electric power for the 5V relay with the same source (classical 5V USB charger) as the source for a water pump (3.3~5V) connected to the ...
Marcel Kopera's user avatar
0 votes
1 answer
1k views

5v to charge a 12 V battery pack (possible with this?)

Is it possible to charge a 12 V battery pack with a 5 V charger (say USB charger)? With the follow conditions... The charger will internally charge cell 1 upto 4.2 V, then switch to cell 2 and charge ...
Panamanian's user avatar
-1 votes
1 answer
66 views

If I had 2xUSBA @2.4A/ea. but only 4A max output from 21W solar panel, would joining the usb cable leads together give me one safe a 5v/4A output?

Mission-Solar fast charge? If I had a 21W solar panel with 2 USBA/2.4A or 4A max outs, could I simply strip and match leads to form one USBC input to a USBC input on a Poweradd PD 30W Power bank and ...
N'moi's user avatar
  • 11
0 votes
1 answer
64 views

300ns Pulse Generator to Drive LED

I wanted to use a 555 timer in astable mode to generate a 5V signal to flash an LED on and off. This works fine when the pulse length of the LED is in seconds or milliseconds. But this got me thinking ...
ClassicBeavs's user avatar
1 vote
4 answers
2k views

12V pulses into 5V pulses

I have a 12V pulse square signal coming from an RPM sensor. I would like to translate it into 5V pulses since I will need to use it as input in an Arduino. What do you guys think is the easiest way? ...
Enzo's user avatar
  • 55
2 votes
1 answer
1k views

STM32 external 5V pullup

I have an STM32G031K8 Nucleo development board and was thinking about interfacing it's GPIO with an old BCD-to-Seven-Segment Decoder integrated circuit (SN74LS47N). This is a 5V part... and while I ...
aosborne's user avatar
  • 135
2 votes
0 answers
167 views

2N2222 NPN Transistor, no current flowing through collector

I have a 2N2222 NPN Transistor wired up in the most basic common emitter setting (emitter grounded, base hooked up with a 1k resistor to 5V, collector connected to load and load connected to +12V). ...
Veestire's user avatar
0 votes
1 answer
89 views

Makeshift Passive USB Charger 5V OVP

I was looking to protect my 5V device from 20V, since the charging port is Type-C, but used for USB 2.0 communication without any power delivery or bc. Expected to be charged with 1A-1.5A from the ...
Ilya's user avatar
  • 3,613
0 votes
2 answers
446 views

How can I switch on 12V 500mA supply to a load when a signal is taken from 5V down to ground?

I have a commercial PCB. On it is an IC with a pin that is pulled down to ground by a normally open switch. I want to turn on supply to a load when the switch is closed. simulate this circuit – ...
Nicolas's user avatar
  • 101
0 votes
1 answer
410 views

Pull 5V using NodeMCU output pins

This diagram is of the little device to read the data from P1 port on the DSMR electric meter. In my case it is Landis E360. RTS and 5V pins are shorted in the diagram and that is to trigger the data ...
bortek's user avatar
  • 15
0 votes
0 answers
771 views

LM2596S-5 Circuit, 7.x V instead of 5V output voltage. What did i do wrong?

for a little project of mine i need 24 and 5 Volts on my PCB. To do so i want to step down a 24V supply. I planned to use the LM2596SX-5.0/NOPB for this task and designed it with the TI Webench Power ...
E.Murphy's user avatar
0 votes
1 answer
662 views

RS-485, 5Vdc and 24Vdc over a single Ethernet cable

I recently started to work on a project that involves motor drivers and microcontrollers in a network topology. This is rather a theoretical question, just something that I was thinking about. The ...
Marcell Juhász's user avatar
2 votes
1 answer
76 views

Circuit power issues causing LCD to change brightness when motor operates

My apologies I'm still getting to grips with the more advanced aspects of electronics, so apologies if this is a stupid question! I'm building a sensor device with a Raspberry Pi, and have got ...
Jack Pollock's user avatar
2 votes
1 answer
80 views

How to tell which side of a Meanwell Encapsulated is AC and which is DC?

I received an AC/DC Encapsulated PSU from Meanwell. The datasheet Meanwell IRM 60 5ST seems to suggest that the the terminal block with two screws is for the AC while the terminal blocks with 4 screws ...
Multimarcus's user avatar
0 votes
1 answer
89 views

The most efficient way to generate -5V out of 5V3 at 30mA

In my design, I need to power up a few op-amps with positive and negative rail. Taking into account amplitude in the signal path, headroom for input common-mode voltage, output voltage swing and ...
Wintermute's user avatar

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