Questions tagged [5v]

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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 ...
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38 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 ...
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1 vote
1 answer
74 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 ...
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0 votes
1 answer
58 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 ...
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1 answer
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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....
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1 vote
0 answers
59 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 ...
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1 answer
34 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 ...
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0 votes
1 answer
78 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 ...
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1 answer
53 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 ...
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0 votes
1 answer
62 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 ...
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-1 votes
1 answer
60 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 ...
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1 answer
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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 ...
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1 vote
4 answers
413 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? ...
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2 votes
1 answer
312 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 ...
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0 answers
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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). ...
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0 votes
1 answer
37 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 ...
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2 answers
109 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 – ...
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1 answer
133 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 ...
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0 answers
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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 ...
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0 votes
1 answer
164 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 ...
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2 votes
1 answer
49 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 ...
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2 votes
1 answer
63 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 ...
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0 votes
1 answer
56 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 ...
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-1 votes
1 answer
129 views

How to change breadboard power supply output voltage?

I recently bought a 3.3/5v power supply like this. I'm powering it with a fresh 9 volt battery and 9 volt to barrel connector cable. Right now, it's on 3.3 volt mode, and I have no idea how to switch ...
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0 votes
3 answers
647 views

How to drop voltage to 4 volt from 5 volt source voltage with resistors? [duplicate]

A SIM800L module needs voltage between 3.7V to 4.2V. The Arduino power source output is 5 volts which will damage the module. Is 220ohm enough? I was testing with a multimeter. Its drops to 4 volt ...
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1 vote
1 answer
179 views

Powering the Raspberry Pi zero from printer PCB

I want to convert my simple printer into a network printer with CUPS on Raspberry Pi. I tested everything with Raspberry Pi 4 and it worked perfectly. Now, I want to fit my Raspberry Pi zero inside ...
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1 vote
1 answer
59 views

12V to 5V 3A DC-DC converter recommendations. WS2811 LEDS

I require to supply 5v to 50 LED pixels WS2811 from a 12V supply. I have looked at many DC-DC converters and one thing in common is quite a low load capacitance. < 1000 uF and typically around 500 ...
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1 vote
2 answers
63 views

Amplifiying PWM signal to 10v analog

I have a 5V PWM signal around 500Hz. I want to have 0-10V analog output from this. I considered using a MOSFET to step the 5V PWM to 10V PWM and using a low pass filter at the output to achieve my ...
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0 votes
1 answer
175 views

Initial connection - 5V LED strip

I wanted to play around with some of these addressable LED strips, so I bought one off Amazon. It's a string of 300 LEDs, comes in a big spool: The spool has the same connectors on both ends, a 3-...
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0 votes
0 answers
151 views

Problem with LM1085 3-A regulator

I've been trying to build a 5V voltage regulator for a PCB that converts a input voltage from 10 to 30V. I've been searching on internet and I've found that the LM1085 was suitable for this case, with ...
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0 votes
0 answers
56 views

Simple question about flow of electricity

I wanted to modify my power-on switch on my PC and decided to add few switches and LEDs before it powers up. Its more of an aesthetic modification but I have encounter one problem which is, shown in ...
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2 votes
1 answer
68 views

Driving a 5V LED on computer chassis with 3.3V

My add-in card uses a pair of pins to drive an external activity LED, with anode "provid[ing] 220 ohm pull-up to +3.3 V". However, the LED that I wish to drive with these pins, is designed ...
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2 votes
1 answer
59 views

5 Volt Regulator 120 mA no Heat Sink

What is a better DC-DC Voltage Regulator than LM317, I am making a 5V Regulator to Drive an IC that takes 5V at 110 mA, but the LM317 draws 2 W power and gets HOT and the box I use does not have Room ...
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0 votes
0 answers
132 views

Solenoid 12 V control with Arduino

I have some 12 V solenoids and I want to control them via Arduino, but Arduino outputs a maximum 9 V voltage through the Arduino jack input, and the voltage on Arduino pins is only 5 V, so how do I ...
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2 votes
1 answer
359 views

Can't get 2-relay module to work through JD-Vcc

I bought this 2-relay module: https://www.amazon.de/gp/product/B00E0NTPP4/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 I'm testing it out using a 5v 1 amp power supply. If the JD-Vcc jumper is ...
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1 vote
2 answers
238 views

5V 4A power supply for simple circuit

I am a 14 year old electronics noob. I am mostly a programmer and mechanical designer. I have been working on a robot which needs around 4 amps of current. I am thinking about using a simple 5V 4A AC ...
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1 vote
1 answer
925 views

How to trigger a Low-level relay with PIR sensor? [duplicate]

I have a SRD-12VDC-SL-C relay with this configuration: https://www.iotwebplanet.com/product/relay-module/ And I want to trigger it with PIR Motion Sensor Detector Module HC-SR501 https://robu.in/...
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6 votes
3 answers
942 views

Change voltage without consumption

Is it possible to change voltage without consuming power? I have a 5V Arduino circuit that makes use of a wireless chip (NRF24L01) that runs on 3.3V. My current approach to get 3.3V out of a 5V source ...
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1 vote
0 answers
1k views

Triggering 12v Relay with HC-SR501 PIR sensor

I have a SRD-12VDC-SL-C relay with this configuration: https://robu.in/product/1-roadchannel-relay-module-light-coupling-12v/ And I want to trigger it with PIR Motion Sensor Detector Module HC-SR501 ...
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0 votes
0 answers
61 views

Safety when creating electronics enclosure

I'm designing an electronics enclosure to be placed in series with the power cord for a device for control purposes and would like to know safest methods to do power breakouts within the plastic box. ...
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0 votes
2 answers
82 views

5v to 12 Power Supply

I have really no idea about electronics. I am trying to provide IR lighting for my night camera that I use with the raspberry Pi. The Pi is powered by a 5v usb power bank. The IR requires 12v. I ...
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3 votes
1 answer
47 views

Automotive Sensor Output

Why does the automotive industry sticks with 5V sensor outputs instead of something like 4-20 mA? Wouldn't it be a solution less prone noise? What are the advantages in using a 5V output instead of a ...
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0 votes
1 answer
61 views

Automatic switching to the changed set of TTL inputs

I have 2 sets of 4 logical inputs. All inputs are active-low 5V TTL level lines with 4k7 pull-up resistors, as they may be pulled to ground by a a user pressing a switch or flipping a transistor with ...
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0 votes
1 answer
130 views

Power supply noise/ringing caused by Jetson Nano booting and data processing

I have a board where I use the Jetson Nano module as the CPU. During the power-on sequence and data processing the Jetson introduces about 400mv peak to peak noise/ringing on the 5V (SMPS) rail ...
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1 answer
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Atmega32u4 on 5V. MISO from IC on 3.3V?

I'm running an Atmega32u4 on a 5V circuit. However, I'm also using a Bluetooth IC [MDBT40] on a 3.3V circuit that I'm setting down from 5V with a linear regulator. I'm turning both SCK and MOSI to 3....
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0 votes
1 answer
51 views

Will my project source most of its current from the battery?

I have a video game controller project that requires a battery. This is because the console doesn't provide enough current on the 5V rail to fully power the project. The battery (and charge circuit) ...
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0 votes
1 answer
196 views

High speed logic level converter circuit

I have been trying to make a 3.3V circuit controlled by an Arduino (5V logic.) I have used a logic converter circuit similar to the SparkFun/Adafruit ones. My problem is that whenever i try to ...
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3 votes
2 answers
203 views

VUSB / +5V selector to safely power KNX project

I'm working on a board that will include a TP-UART IC + an ATMEGA328-AU on the same device. I'm now facing the potential risk of damaging the host computer or the TP-UART IC if I'm mishandling the ...
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0 answers
43 views

Calculation of the resistors values in a voltage divider

I'm working on a circuit where a 3.3v flash memory, which comunicate with SPI protocol, has to be interfaced to an 8-bit PIC microcontroller working at 5v. For the MISO signal there should not be any ...
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0 votes
1 answer
42 views

Fusing an In-Wall LED Application

I'm building my own PCB to power 8 in-wall LED's for a stairwell. I'd like to protect the LED's with fuses, but I'm unclear on how the voltage on fuses work. My specs are as follows: LEDs: 5V, ...
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