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Re: What is a Mosfet
Yes I know its a switch but I thought it was more than and on/off switch and the output to the drain changes as the gate signal changes ?
What is a Mosfet
Ok I know if you apply voltage to it and a drain, then add a small voltage to the gate it powers the drain with the higher voltage/current right...
And it goes up and down as the low voltage is applied right...
So a Mosfet is just a variable rate relay then... right ?
Re: Auto battery charger - help needed
This is the reply I got from them...
It does cut off by itself. If it is not clear to you, it goes between the power supply output and the battery and opens the charging circuit when the set voltage is reached.
Maybe they meant that it does not...
Re: Auto battery charger - help needed
OK I just joined that forum to ask about this... I want to see what he has to say about it....
What would be needed to make it cut OFF at a pre set voltage ?
Can you look it over and know whats needed to make one like what I'm talking about ?
This is...
Re: Auto battery charger - help needed
It cuts off cleanly at the set cut off voltage with no current flow, and no current flows until it cuts back in again. The only thing I can think of that would make it work the way yours does is if you have the battery and charger connections reversed...
Re: Auto battery charger - help needed
A123's are NOT LiPO.............. they will not have the heat or over voltage probs as a LiPO anymore so than a NiMH.
I need to read up more on that thread about the cut out deal, I took it that it cut out the circuit it self.... did you read the thread ?
Re: Auto battery charger - help needed
This is a DIY adjustable charge cut out device intended to be used with A123 battery packs. It's range is from about 9 volts to about 25 volts, so it can be used with A123 packs from 3 cells to 6 cells. It has been tested to 20 amps. A heat sink will be...
Re: Auto battery charger - help needed
The charger and method in the link is proven and works..... it shuts off all power to the batteries unless they go below the set voltage...
I would build it but have NEVER don anything like this and really not sure about the turn out if I did, but some...
Re: Auto battery charger - help needed
The charger will put out more volts than the batteries are rated at, until they reach a charged state then it cuts out.... thats how all battery chargers work..
I've been reading allot about ZIP charging the A123 batteries, some people are hitting them...
I'd like to make my own charger.
I got a 3 cell A123 battery pack thats 9.9v and can be charged at 5 amps.
So I'd like to be able to hook it up to a 12v power source and it shut off when it reaches 12v and it not go over 5 amps...
How could I do this and what would I need ?
Thanks.
Hello, I'm a long time tinkerer but never learned electronics, over time I learned a few things about some of the components and some what of what they do, but every time I get to salvage some parts I pick a few things out like Mosfets, heat sinks, capacitors, leds, and so on...
Right now I...
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