Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
I recently bought a replacement battery for my camera, charged it up, then unplugged it after charging. When I picked up the charger I got a nasty shock.
Is this likely to be a faulty battery? Or could it be the wiring in my home? I need to know where the problem lies.
What is the simplest, portable, lightest, smallest (even if not the safest or efficient) solution to charge a 2nd car battery (located in the trunk or passenger cabin) while driving a rental car (sedan or SUV)?
For example, can I just use a 3 m jump cable between the two batteries all day/while...
Hi all,
I'm currently wrestling with what appears to be a parasitic drain on my 2005 Range Rover Sport (L320), but I'm hitting a dead end with it and was hoping someone could help.
Symptoms:
Battery almost fully discharges after ~48 hours
Steps taken so far:
Recorded & Measured DC amp...
I want a portable desk lamp that's powered by some kind of rechargeable battery cell. (A lamp with a normal bulb fitting, not LED.)
Can anyone advise me on this? I'm clueless with electronics and can't solder!
Hi, I wonder if anyone could help me!
In my project, I want to create a battery-powered motorized ‘lazy susan’, where the top part of wood will spin with an object on top. I am quite confident on how I will attach all the components to do this as there are many youtube tutorials on the internet...
I am making a coil gun with a classmate, and we are doing it as a home science project. We have the basic idea of how a coil gun works and how dangerous it can be, but we still are confused about what power supply we should buy. We want the power source to charge the capacitor bank for around...
Hi all,
New to the forum so please excuse the ignorance.
I am looking to use a few second-life EV cells to make a home energy storage solution. I'm pretty comfortable with the more basic aspects of charging and battery management, but the inverter area I am finding a tad confusing.
I would...
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 to make a highly efficient, extremely low drain, motion triggered 12V battery powered dimmable...
Hi, I'm quite "new" to the world of electronics I have a CS background and I have a quite old tablet laying around that has power supply issues... it started randomly turning off so I used it with the charger plugged in for a while and now it doesn't turn on.
I managed to start disassembling and...
Hello
Currently the Grape-Express Mini development board is on Kickstarter. It's a microcontroller board like the Arduino Mega2560 R3, but this board includes a lot more than just Bluetooth, Wifi, and self-sufficiency. If there is interest, then look on the web page. The goal is not set high but...
Hello everyone, this is for my design project and i need help on a circuit regarding wind turbine.
The turbine will be used on a fishing boat. Also, the turbine will power up a raspberry pi 3. Our only problem is hooking up the wind turbine to the raspberry pi. The load will be approx 10W. Our...
good morning, first post...
I have a small project that i'm trying to accomplish and i'm am not very good at electronics, so I've come to all of you. Here's my goal;
I"m trying to power (2) rolls of LED strip lights for 3 hours a day, solely by battery. The project will run in a display...
I am on trip and now I am is small village where I can't buy anything soon. I need charging 4 AAA batteries. Battery have 750 mAh. I have this old charger from Germany.
I have electricity 220 v. How many hours I need to charge to battery be full?
Thank you in advance.
Hi there, I am just experimenting with a simple circuit that recharges 1.2V 3000mAh AA battery. But I have not idea what is the correct voltage to apply to the battery to recharge it. Do I need to apply 1.2 Volts? Maybe a little bit more? This circuit recharges the battery using induction, so...
Hi! I've been working on a project and I need it to be portable.
So I have two batteries of PKCELL LP785060 it's a 3.7V 2500mAh battery.
I connected the two in series which gives me a 7.4V battery.
My question is, can I use the adafruit powerboost 1000C to charge these batteries connected in...
I have been asked to play a role in the design of a 12V backup battery pack that would be used to backup a vehicle security system and siren in exclusively AUTOMOTIVE applications. I have general electronics experience but no experience with the design of a battery backup system, and the...
Hi,
I'm thinking of making a multi drill for wood drilling, that uses anywhere from 6 to 9 9V or 12V DC motors. These motors would be wired in parallel, with one battery source. I'd mount a drill chuck on each of the motors shafts for a drill bit. Now, I need a little bit of help from you. Do...
Hey everyone, I'm working on a little project but circuit design isn't my area of expertise. I want to build a little electric fence to put around some potted plants and keep the squirrels away. There isn't an electrical outlet nearby, so I want to rely on solar power.
I bought an electric fly...
This is a project I’ve recently started working on.
I’m trying to setup a LiFePo4 12V battery replacement for a normal lead acid car battery. Please note, this is NOT for an electric car, its for a normal Internal Combustion Engine Vehicle. I just want to replace the Lead Acid Battery with a...
Hello all, I'm new here. I'm seeking knowledge and advice about a Lithium ion battery bank that I made. I got these batteries from work out of a device that we replaced the batteries on. It is a somewhat proprietary battery as it is made specifically for this device and not open to the general...
Hello,
I trying to find a equivalent battery model for a PHEV (plug-in-electric vehicle)
and simulate the charing process in LTspice.
I want the battery to have SOC=0, an empty battery from the begining, and starts to charge between the charging range of 320-380 V. I know the battery should...
I constantly read that capacitors provide reactive power. So how are they used instead of a battery? I mean in a battery the voltage and current are in the same phase. How is the phase change between the voltage and current in a capacitor eliminated without using an inductor, to use capacitor as...
I am pretty much new with this adapter thing. I bought an adapter today with a 9 V rechargable battery. I tried my multimeter between the output and found something interesting. The output voltage is 5 volts on the 9V port. But when I am connecting the battery and turning the adapter on the...
Hi there,
I have a Victron Centaur battery charger, 12v 200 amp output. It's a monster!
On inspection it's actually two identical 100a chargers in the same case, connected in parallel. Other than a tiny 3 wire cable whose purpose I'm not sure of, there is nothing connecting the two chargers...
Hi guys,
It's been a while. Before I actually buy a UPS backup supply, I need some advice and potentially save more than 50 dollars.
I found one from a friend (APC ES 500). Naturally, it was already dead.
I've hooked it up to the mains and no indicator LED or anything turned on. Dead as a...
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