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.
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...
Hi, I'm new to electronics and I've been starting a project of my own which is a charger (since i though i should start first at power electronics since its all about electricity before pursuing switching electronics or automation). I had previously created a charging system (using the li-ion...
Hi all:
I'm starting a Hackaday project to open source my proven desulfator engine. This is a pulse charge engine for batteries outside the vehicle as it delivers 250W RMS capability to the battery with up to 800A pulses...
Hi folks
I found this forum via a Google (is your friend0 search. I found some threads loosely related to my question, but nothing specific. Hopefully, some of you electrical/electronic aficionados may be able to assist.
I have an old 'Transwest' brand Regulated Power Supply in good condition...
Hi All
I'm having a dilemna at the moment, I have designned a battery balancing circuit and need connector for this that are rated at 10A max per contact perivously I used a SAMTEC IPBT connector which met my requirement the only problem was the height with the connector and the mating half had...
Hi all
I am in the process of designning a battery measurement and balancing system I was thinking of using a TI BQ76930, I am following the design guidelines found on pages 4-7 (**broken link removed**). The main issue I am having with this design is identifiying the following properties I am...
I want to construct a 3 s 18650 li-ion battery pack with a bms, could somebody please help me in constructing this circuit i have no idea about the bms and the connections, also please provide a link of all the product that will be used
Hi
I have searched the forums but cannot find the answer, does anyone know of a rechargeable Lipo battery supplier that is trustworthy as a Google search provides companies from China with little information about their reputation ? We would like the battery to be similar to the one below and...
i have a system that consists of a 12 volt 18 amp hour battery, a planet audio BB1200.4 class D 4 channel amp, a JBL GT5-15 sub in free air, and a battery tender charger. at first, i was using proel flash 8p mini PA speakers as mains, but tonight, i hooked up a brand new pair of JBL Northridge...
I collect old vhs, and recently got some cool gimmick ones that light up when you press a button. However, they are almost 30 years old and no longer work.
Taking a look at the pcb both were heavily corroded. I scraped off as much green corrosion as I could and replaced batteries but no luck...
I was wondering whether someone could help!
Basically, I'm working on a show called Tech Hunters - where we modify old tech like Gameboys, Playstations and all that - and make them useful in a different way - for instance we're putting an oyster card chip in a casio watch so that you can tap...
I have been looking into back-flow protection for batteries and chargers and invented this wonderful circuit, and as usual when you search you find that it has all been done before. Just so in this case and the circuit in Figure #5 of the application report linked below, not only uses a similar...
First of all let me introduce myself, I'm an electrical engineering student in college. I've been working my whole life with electronics but this is my first experience with 18650 batteries. I've made my own 50W high power flashlight and it's working nice off of wall power. However, I want to...
Hi everyone,
I've been surfing the web trying to find a schematic for a constant current DC load tester for use with a battery bank (48VDC) Ideally something that can handle 50amps or more would be fantastic! So far I've only found either low current or useless schematics online with nothing...
this isn't exactly an "automotive" etc. application, but it will be a 12 volt system, just lacking an alternator. there are a few issues i need to iron out though. it was originally supposed to be a 36v system, but that created a lot of problems eg. separate batteries for an EQ/crossover or...
Hello
I don't know much about solar stuff.. I have been researching a lot lately on the topic. I stumbled upon this solar inverter on ebay
**broken link removed**
**broken link removed**
It has a pwm charge controller but what interests me is that with only 40A current 750W panals can be...
Hello everyone. I am doing a project in which I use a buck converter to convert high vtg to low vtg.
Actually the input to the buck converter is from a solar panel which puts out 560 mA constant current and 34 V.
And output is a 12V lead acid battery. The N- Channel mosfet is used at high side...
Sorry if this is too beginner for this forum, this is my first attempt at designing a solution for an electronics circuit. I have the dancing gopher from Caddy Shack, which switches on from a push toggle button, and runs two 3 volt battery powered electric motors which make the item dance. The...
Would there be a way to make a small led light glow (even dim) constantly for six months to a year (or longer) using thin, and lightweight, batteries? I'm thinking that cell phone batteries will be small and light weight enough but not sure if it has enough stamina. The smallest led bulb I can...
Hi All:
I've been on ETO a while and learned a lot. Now I've turned my attention (over 3 years) to a serious problem in my neck of the woods and the general developing world. 'Backyard lead battery smelting' and the toxic outcomes.
In short I've built and validated a solution that works...
Hello, I have got my hands on one of my old IPhone 4 devices, an A1349 model. It had been so long since I used it, that when I found it, I was interested in getting it back up and working. However, I forgot the password and after looking online I found that you could factory reset the phone...
Hi! I may seem a bit dumb here but, please don't be rude. Recently I bought some solar panels for a very cheap rate. I have been thinking to use it at my office. I have this commercial inverter ups system at my office https://www.staticon.ca/product-detail/stativolt-inverter-ups-systems. How can...
Hi guys,
I've a vehicle tracking modem which is going to connect in a vehicle has 12v/24vDC battery. I just need to connect a backup battery(12vDC) to modem for uninterrupt power supply i.e if 12vDC/24vDC battery goes off, want to switch over to backup battery. Also the backup battery...
Hello, I have a first generation of CTEK MXS 5.0 lead acid charger. My charger does not have RECOND mode for small bateries.
Differences (see attached voltage/curent tables from manuals):
Questions:
1. Is there any way to limit the current to 0.3A on my charger that gives 1.5A in RECOND mode...
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