Questions tagged [portable]

For questions about electronics designed to be easily carried or moved (which may require special considerations for size, weight, battery operation, low power, etc.) or software designed to be used in a wide variety of environments.

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Why does my USB-C PD trigger circuit not work in tandem with a DC-DC voltage step up module?

Good day internet humans, I am pretty new to the world of diy electonics, and am in the process of putting together a DIY portable computer monitor built from an lcd panel from an old laptop and a ...
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2 answers
459 views

DIY portable bluetooth speaker; charging/battery question

I'm new to this and i'm doing my first real build for a friend. What I got so far: Amp: ZK-TB21 Here BMS 3s 40A balance Here 18 18650 battery on 3S pack 2 x 25W generic speaker and 1x30w tangband ...
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Part Suggestions For ECG Project

I am planning to build a project around https://www.sparkfun.com/products/12650 to take an ECG while I am on a roller-coaster (not for medical purposes, just for fun). The following points are (...
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2 votes
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Portable Headphone Amp Power Supply 18V MCP73871 TPS61178 TPS7A470

Disclaimer: I'm fairly new to diyaudio, amplifiers, power supplies, schematics, PCB design and everything that this forum touches on (read: noob), so I urge you to be patient with me - I am eager to ...
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How to make sure you have "adequate" ground in a self-enclosed portable circuit?

How to make sure you have "adequate" ground in a self-enclosed portable circuit? I read that a good ground ensures steady signals. But, if you run a circuit from a battery it is not connected to ...
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664 views

Power use question for a trail camera

I am trying to calculate how long that a trail camera can be deployed before the batteries run out. The trail camera in question is a Reconyx HyperFire 2. Here is a useful review of the trail camera ...
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1 vote
2 answers
473 views

Do Battery Powered devices require bulk cap at power input?

I am in the process of designing a +5V power supply for a hand-held 2xAAA powered device. When using TI's webench simulator tool to simulate a switcher power supply that I am considering, I noticed ...
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3 votes
1 answer
261 views

What is the proper methodology to create portable FPGA designs?

FPGA designs may contain RTL along with IP blocks. These IP blocks most likely shall be from the vendor of the FPGA. Examples of such IP blocks are instantiating dual clock FIFOs, floating point and ...
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1 vote
2 answers
4k views

Charging two 18650 batteries in series with a 5V USB wall charger?

I'm looking for a good and space-saving solution to charge two 18650 batteries in series. The project is a small boombox, using an amplifier board that works with voltages between 4.5V to 25V. The ...
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1 vote
3 answers
77 views

portable power supply

My wife has a tabletop light she uses for quilting work. She wants to take it with her to a class that has no access to AC. Output from AC plug to lamp is 12V, 3A. I have searched for power formulas ...
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2 votes
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DIY 4S Li-Ion battery pack

I am in need of some help designing my battery pack. I have a few concerns, mostly around charging. My plans consist of using a microUSB boost converter to bring the voltage to 16.8V for charging. ...
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1 vote
1 answer
720 views

Calculating life of portable power supply for icybreeze cooler [duplicate]

I recently purchased an IcyBreeze Portable Air Conditioner and Cooler for an upcoming camping trip. I want to run it on low for two nights, or about 16 hours. With this in mind, I purchased the ...
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1 answer
56 views

Portable speaker- battery pack problem

I started building a DIY portbale speaker out of a douk audio tp 3116 and an old pair of sony speakers. The spec on the ebay site of the amp says that it operates between 12-25 volts, but for the 60 ...
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1 vote
1 answer
303 views

Pico-itx motherboard Powered With Battery

I want to built a portable pc system. I am interested in the Pico511 pico-itx motherboard. My concern is how to run a system like this on battery. It's using 12V and for the top configuration it ...
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2 answers
283 views

Ac current source(1-10mA) with help of 5V dc battery

I have been working on a project in which I have been using an Howland AC current source (it has an AC voltage source in it) as a current source. But as an upgrade, I need a current of same sort which ...
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1 vote
1 answer
1k views

Draw power from a portable mobile charger to power circuits

I usually power my beginner prototype circuits using mb102 power supply board, but it needs an external elimeter to draw power and then regulate it. I was looking for a portable solution for my 5 ...
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1 answer
812 views

5.5" portable CRT television with several black lines

I have this monochromatic chinese television largely manufactured in the past decade, marketed under several brands (Coby, Curtis, Precision, etc). This one in particular have a external AC DC ...
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3 answers
2k views

Running a 12V 1.6A fan on a battery

I am building a portable A/C (really it's just a box with a fan and ice packs) and I want to use a 200CFM case fan. It's rated 12V 1.6A. I was hoping to direct connect this to a solar panel and keep ...
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1 vote
2 answers
4k views

Powering 12V 2A device from high-power USB portable charger

I'm in the middle of a project and I've recently bought a 26,000mAh portable charger with 4 USB ports on which can each deliver 5V and 4.8A max. In my project, I'm using an amplifier which needs an ...
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1 answer
78 views

Detect battery/cell's charge

I am building a portable device with Raspberry Pi and powered by 3 AAA batteries in series. I am trying to create a battery indicator with a LED: Green = Full power Orange = Half power Red = Low ...
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1 answer
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How dangerous are portable CRT televisions?

I want to use an old portable CRT for a project, but I don't know how dangerous the capacitors are, and if they'd be as bad as the ones inside a normal CRT. It takes in 12v dc via adapter, or 8 D ...
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1 vote
1 answer
151 views

Power supply for a 3.3v portable device based on dsPIC33FJ128GP804

I have been building a portable device which has as its main components a dsPIC33FJ128GP804 and a graphical liquid crystal display, which is working fine. The PIC voltage range is specified at 3.0v ...
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0 votes
2 answers
890 views

What is a suitable material to cover photo voltaic panels?

I'm building a small, portable, modular solar panel array to charge 5V power banks, phones, etc. I got most of the electronics down, the Step-Up converter, by-pass diodes, blocking diodes, as well as ...
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2 answers
394 views

Portable speaker project [closed]

I would like to create my portable speaker box. I am new so please be patient with me. My idea is use TP4056 chargers to charge two li-ion, then via step-up boost modules feed PAM8403 3W amp, and ...
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3 votes
1 answer
163 views

powering 900 led's

I am hoping to make an LED panel for video recording. This is the video I am building based on. I am relatively a novice when it comes to electrical work, but I am competent. This project will use ...
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-1 votes
1 answer
357 views

2x50w stereo vs 100w mono amplifier efficiency

Which is better for efficiency. mono 100w amplifier or stereo 2x50w It is important because I'am building a portable speaker and it is really important for me to use little power. Also which will ...
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0 votes
1 answer
505 views

Powering LEDs + a Controller with Lithium Ion Batteries

I am trying to build a portable project with some form of RGB LED (probably APA102) and a controller such as a Raspberry Pi. I am trying to figure out what is required to safely power both the LEDs ...
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1 answer
11k views

Adding Bass and Treble control to existing schematic

I have a little project in mind that I want to try. This picture below is a stereo amplifier circuit. For more info about it, you can see this page. Stereo Amp The circuit above only has Gain and ...
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1 vote
1 answer
2k views

How much physical damage does dropping electronic devices cause?

Phones iPads and other modern portable electronics get dropped. Before the screen is broken and damage becomes physically visible beyond a warp in the entire device structure, How much damage is done ...
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2 answers
147 views

Best way to control heater coil in portable application

I have a resistance wire (kanthal) that is about 2 ohms; with a power source of 3.5V. I'm trying to figure out the most efficient and portable way to control the coil; I'm toying with a mosfet right ...
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-1 votes
1 answer
3k views

What capacity LiPO battery is equivalent to 5 AA batteries?

I have a Casio MA-120 keyboard (musical). Which requires 5 AA batteries. On back of the keyboard there are power source instructions which says: ...
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2 votes
2 answers
421 views

Fast-stabilising skin temperature sensor

We're currently trying to build a portable temperature sensor for the purposes of estimating human core temperature. This is a bit of an engineering problem (more to do with choice of materials than ...
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2 votes
5 answers
376 views

How to Choose a Battery

I would like to start off by saying I have little actual experience in electronics, so bare with me, and for all I know I could be way in over my head. Anyway... I was thinking of making a ...
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1 vote
3 answers
1k views

Good portable 5V 1.5A power source [closed]

I'm a computer science student who is trying to make a portal augmented reality version of the Oculus. I'm looking for a power source that will is both portable and able to deliver 5V at 1.5A for an ...
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3 votes
2 answers
214 views

Li-Po Battery Management

I am creating an open source dive computer (diydivecomputer.com) and have been looking for the simplest way of managing the battery which consists of three functions: 1) managing the charging of the ...
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3 votes
2 answers
972 views

Power switch for a dive computer

I am creating an open source dive computer (www.diydivecomputer.com) and I am having a little bit of a problem trying to figure out how to power the device on and off. The problem is that the device ...
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3 votes
2 answers
1k views

Portable 5V power supply

I am usually in need of powering my microcontroller projects with 5V. Typically this is not a problem, as I use any power supply (converted PC power supply, wall adapter, USB, etc.). However, when I ...
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