Questions tagged [battery-operated]

Involving or pertaining to a circuit or device that is intended to be operated with cells or batteries (as opposed to mains power, for example).

Filter by
Sorted by
Tagged with
1
vote
1answer
55 views

Establishing Safe Operation Range for Lipo Battery with Buck Boost Converter

I have a circuitry that I need to power up with lipo battery. I need to regulate battery to 3.3V with buck-boost converter, since LDO can not be able to provide required current output and causes ...
0
votes
3answers
57 views

Failure of a C cell in a 4x battery pack, potential causes?

I am trying to understand failure of cells in battery packs of 4 x alkaline C cells (in series, so ~6V output). The failed cells, from 2 separate battery packs, have bulged and leaked out, you can see ...
1
vote
2answers
329 views

3.7V to 5V step up not providing enough current

I'm trying to power up a circuit that consists of an Arduino Nano, 3x 3W stereo audio amplifiers (PAM8403), an audio player module and 20x RGB LEDs. The power source is a lithium battery 3.7V 500mAh. ...
0
votes
1answer
49 views

Lithium ion battery safety in car?

i want to use a lithium-ion battery as backup for my circuit in vehicle. i scare about explosion and safety . i decided to use TP4056 ic but many batteries has not temperature pin . - can i use ...
0
votes
1answer
29 views

Inductors and caps on buck-boost converter getting very hot under medium-ish load

I'm currently using a buck-boost converter (generic XL6009 buck-boost like this one) to power a router and fiber terminal from a 12V battery backup system. The reason for using the buck-boost ...
2
votes
1answer
139 views

+ and - 12 V power supply with 12v Batteries, How to make a ground rail with both batteries

I'm new to electronics. I want to make a battery supply to power an OPT301M {photodiode with integrated op amp} and an ADTL082 dual {op amp IC} in order to attempt to reduce noise in the circuit. I ...
0
votes
1answer
92 views

What is wrong with my USB Li-Ion charging circuit?

I'm trying to design my own PCB based off of this one: My relevant schematics are here: Their Q3 transistor DMG3415U-7 was going obsolete, so I used DMP2045U-7, which seemed to be a similar ...
1
vote
1answer
115 views

Simple low power rising and falling edge enabled circuit

I am working on a project where I use an esp8266 and a reed switch sensor (NO), this is powered by a battery so I need a low power circuit that can turn on the esp8266 when the state of the reed ...
1
vote
3answers
734 views

Conductive body of flashlight

I have a flashlight that seems to use the inside of the metal body to conduct the negative terminal of the LiPo battery inside. The outside isn't conductive - likely anodized. Would there be adverse ...
1
vote
1answer
49 views

Needing a simple circuit to switch a vacuum pump from a pressure switch at 4.5v

I’m looking for some help to build a simple circuit to take a NO switch input and use this to drive a 3-5v vacuum pump. The switch I’m using is open when the pressure has not been reached (Which is ...
1
vote
0answers
38 views

reverse polarity and low voltage protection circuit proposal

I'm designing my own li-ion single cell protection circuit, whose requirements are the following: Shall be protected against reverse polarity Shall disconnect power whenever the voltage battery is ...
0
votes
2answers
289 views

What determines if a battery is charging or discharging in a circuit?

I have a basic understanding of DC circuits from high school and university physics courses, but those courses only covered circuits that discharge batteries. I'm trying to build an rudimentary ...
0
votes
0answers
25 views

DIY solar setup related questions on following topics: VSR, storing batteries correctly, wiring diagramm, misc

Please keep in mind I am not an electrician, however I have spent a lot of time researching the basics to obtain a fundamental understanding of the topic. Also, this project is an enhancement to an ...
0
votes
2answers
56 views

Can I put my battery in the middle of my parallel circuit?

This is a small project, basically cosplay, four 5mm LEDs wired in parallel. Normally, I put the battery at the end: But could I put the battery in the middle with the same result? I'm researching ...
0
votes
1answer
67 views

Automatic series/parallel configuration

I've been thinking about this issue for a while now and came here for your guided assistance. Situation: Ik have 4 resistors (12V/1.25W heater pads). I need to power them with either a 12 or 24V ...
1
vote
1answer
242 views

How to fix 4AA battery pack holder

I have a battery pack holder. I have tested the batteries with my multi meter. It appears that the ground and power wires on my pack holder are not working. Does this mean that the wires are not ...
1
vote
0answers
37 views

How to Modify LED panel’s power board to turn it on/off using Arduino pro mini

I’m a software developer and beginner in electronics. My objective: I want to modify, https://www.amazon.com/Ulanzi-Ultra-Bright-Video-Light/dp/B0757KCWGW LED panel product in a way so that the on/...
1
vote
0answers
41 views

I want to build a battery based DC supply for LED mirror that has AC power cable (230VAC)

I recently purchased an LED mirror that is AC powered (230VAC). The problem is there is no GPO (power outlet) in the room. I am trying to make this wireless and wall mounted. I tried researching DC ...
1
vote
2answers
161 views

Buck Boost Battery 3.6V (Lithium-thionyl Chloride) to 5V

I hope this question has not been asked and it's not as far as I have seen. I am developing an IoT project which uses almost no current (< 100uA) when sleeping and up to 80mA when running. The ...
0
votes
0answers
55 views

Mini PC stick can be powered with mains power adapter (5 V/2 A) but not with power bank (also 5 V/2 A)?

I bought this product with the hopes of powering it with a power bank: https://www.intel.ca/content/www/ca/en/products/boards-kits/compute-stick/stk1a32sc.html https://www.amazon.ca/gp/product/...
0
votes
1answer
333 views

ON/OFF push button circuit with battery under voltage protection

I have put together the push button circuit explained in TI's SCEA048B application report with an under voltage protection using TI's LMS33460 chip. I ended up with the circuit attached. The idea is ...
1
vote
1answer
26 views

How can I determine what kind of power supply or battery I need for my four NEMA 23 stepper motors?

I am trying to determine what current my power supply needs to have for my mini rover project. The NEMA 23 motor specs are as follows: Bipolar amp/phase is 2.8A and the bipolar resistance/phase is 1....
0
votes
0answers
17 views

Battery powered device - How to measure external floating differential voltage

I have the following task. As depicted in the sketch, I have a battery powered device which needs to measure the differential voltage VIN between two external nodes, EXT_NODE1 and EXT_NODE2. It is not ...
0
votes
4answers
69 views

What is this white box in a battery pack?

I have an O2 Hurricane canless air system that seems not to charge anymore. I was a bit surprised because it hasn't been through much use or many charging cycles, and customer support was non-...
2
votes
1answer
1k views

Batteries connection to load and charging port for DIY bluetooth speaker

What I'm trying to accomplish is buidling a battery powered bluetooth speaker. In order to do it I'm using the following parts: Bluetooth amplifier module 3x Samsung ICR18650-26FM Batteries ...
0
votes
0answers
75 views

Powering a RF circuit with CR2032 along a capacitor, pulse currents of 150mA

I am designing a battery powered circuit which performs RF communication. The goal is to use a 3V CR2032 battery. The RF circuit consumes 0.2mA as average current and lowest voltage it can work on is ...
1
vote
1answer
66 views

12v wiring regulations (UK)?

What regulations (if any) do I need to follow if wiring a 12 volt system (in the UK). I was planning to wire up a garden shed / summer house to the 220v mains. I'm confident I could wire it safely ...
2
votes
1answer
192 views

Implementing protection circuitry for a single cell [closed]

I'm hoping to embed a protection circuit for a single 18650 in my device's circuit. No over-charge protection is needed since it won't allow charging - so only protection against over-discharge, ...
0
votes
0answers
33 views

Powering and dimming white LED from single-cell 3.7 rechargeable lithium battery (with a 3.3V Arduino mini)

I'm designing a circuit for a handheld project that runs from a 1-cell rechargeable Lithium battery (18650 or prismatic). The circuit powers an Arduino Mini Pro running at 3.3VDC. The Arduino board ...
0
votes
1answer
62 views

Efficiently reducing input voltage

I have a battery powered system that currently supports up to 5.5V input voltage (which amounts to 2-3 AA batteries in series.) I'd like it to support up to 4 batteries in series (so up to 7.2V ...
0
votes
2answers
611 views

Increase current draw of a low-voltage DC fan circuit

I have a DC fan circuit that is intended to run off of a portable USB battery pack. The fan is a 5V brushless computer fan that draws approximately 250mA. The issue I am running into is that all the ...
0
votes
0answers
22 views

Additional battery in parallel (Li-ion)

So, im trying to figure out how to wire in an external battery for my computer electric scooter for more range. I messaged the manufacturer but only got a concluding message of the factory workers ...
0
votes
3answers
291 views

Emergency Backup Battery Supply

I am building a NodeMCU controlled 12v solenoid. I am hoping to add an emergency backup battery supply, but the emergency backup supply should not power anything but the solenoid. In other words, if ...
0
votes
1answer
43 views

How to use LBO on Powerboost 1000C as input for Arduino

I am using a project which uses an Arduino Uno and a powerboost 1000C. in the manual it says, LBO - not a leveraged buy out! this is the Low Battery Output. By default it is pulled high to BAT but ...
0
votes
2answers
58 views

small inexpensive battery powerable component for daily timer circuit with LED and button

I want to make a small "visual alarm" device that turns on a LED every day at a time (e.g. 17:00) and turns the LED off on button press or (if no button was pressed) at a later time (e.g. 22:00). I ...
0
votes
2answers
29 views

Extracting 25W from a pair of 18650 li-ion in series

If I have 2 bats of li-ion in series. 8.4V full charged and 6V full discharged. What should be their minimum mAh capacity, if they are 18650 size, and considering a constant load of 25W. 25W/6V = 4....
0
votes
1answer
40 views

Replace UR battery by IMR with lower mAh [closed]

I am replacing a shaver’s battery, a Braun Silk Epil 5. It uses a Li-Ion battery manufactured by Sanyo for Braun. According to my research it must be a UR Battery like the UR18500L : ...
1
vote
1answer
44 views

Calculating Battery Life with different working voltages

I have device that draws 30 uA in current continuously, and it is powered by a Panasonic CR2032 device (240 mAh - continuous standard load current: 0.2 mA ). There are two components on this device, ...
2
votes
2answers
90 views

Limiting input voltage for buck converter

I want to power some micro controllers and a couple of leds on my electric bike, counting up towards 5 Amps. Power supply is a 36V battery, with a range of about 42V to 33V. This voltage is to be ...
2
votes
0answers
30 views

Check my battery powered layout

Few days ago I had topic about issue with power inductor crashing circuit. I almost resolved issue without making new by 90%. However sometimes circuit crashes -> I did some updates based on replies. ...
0
votes
1answer
53 views

Motion triggered battery powered dimmable COB LED light

My view on life, in any field, is not to produce more but to consume less. Everybody told me this is a very eccentric weird mentality. Perhaps they are right. Nevertheless I have to build my project ...
0
votes
1answer
28 views

Times a DC motor can be driven from pair of AAA 1000mAh

If I have 3V voltage made from two AAA in series, both 1000mAh and driving a 3V 1.5W DC motor with it, being the duration of tON exactly 1 second for each drive attempt. Is it possible to estimate the ...
0
votes
1answer
65 views

Battery powered step-up converter not gives enough amps

I am creating two part PCB running on Li-ion battery 26650 (3C discharge rating, max capacity 5000mAh) powering few LED strips with controller. PCB 1 (schema 1) has step-up converter MT3608 which ...
2
votes
3answers
158 views

9v & 2 high power LEDs | LEDs dim after time, bright again after being off

I'm trying to learn some basics of electronics and electricity with a simple solution to a problem. Problem: I have an African Violet in a terrarium that I want to help bloom, which means it needs ...
1
vote
1answer
75 views

12V lead acid battery instead of 11.1V LiPo?

I'm doing research on a remote control model ship. I have 11.1V LiPo batteries, but because of their weight and duration, larger batteries are considered better in this application (these batteries ...
0
votes
1answer
62 views

Power supply or-ing with ideal diodes - priorities?

My PCB can be supplied by internal LiPo, USB or via an external supply through a data connector that also carries power. Right now, I have the power inputs or-ed with LM66100's. I'd like to ...
0
votes
1answer
41 views

How can I determine LI-ion battery charge while varying the load?

I'm building an autonomous boat which contains a li-ion battery pack and I want to know how much charge it still left in it. To do this I measure the voltage of the battery pack. I let it run for ...
1
vote
1answer
1k views

Lithium ion battery protection IC not able to drive MOSFET

I have integrated the TP4056 charger design into my PCB. The problem is that when I connect the battery at the battery terminals, I am not able to get the voltage at its output pin. The circuit can be ...
1
vote
2answers
259 views

Noisy op amp buffer

I made an op amp buffer using a TL071 for my guitar but it is very noisy. The circuit is a simple follower. Originally I had no feedback resistor but I added it later in case it decreased the noise ...
2
votes
1answer
22 views

voltage fluctuation observed in two parallel Li-socl2 battery

Application: our device working is like it wake up 5 times a day wake up period is nearly 30 sec and during this time take measurement from sensor and send data on zigbee and go to sleep.active mode ...

1
2 3 4 5
12