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/diy/ - Do It Yourself


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2780759 No.2780759[DELETED]  [Reply] [Original]

im trying to diy a coil gun, im looking for a circuit that could tell me when the capacitors are fully charged?

>> No.2780760

If you don't already know then this project might be too advanced

>> No.2780774

> hey mom ima build a rail gun!
>
> umm son, do you know what volts are
>
> nah mom, but i seen one in a vidya

yah, I remember when trolling was a art

>> No.2780790

>>2780759
>circuit that could tell me when the capacitors are fully charged?

you just need ears
charging caps make a swooshing sound
when full, sound stops
just like your toilet tank

>> No.2780791

>>2780759
Wouldn't they be charged when the voltage going into them is the same as the voltage coming out?

>> No.2780819

>>2780791
>when the voltage going into them is the same as the voltage coming out?

Don't plan on writing any technical documentation any time soon.

>> No.2780824

>>2780819
I was just guessing. How are you actually supposed to know?

>> No.2780825

>>2780791
I think you mean current
And the current going in to something is always the same as the current going out.

>> No.2780826

>>2780824
voltage DIFFERENCE ACROSS THE CAPACITOR
or the current going into the capacitor will be 'zero' ish
or you will have used the RC constant to calculate when an acceptable amount of charge is in the capacitor. Charging one up to 'full' can take a very long time.

>> No.2780830

>>2780826
Isn't voltage difference across something the same as saying the voltage going in vs the voltage going out?

>> No.2780857

>>2780791
lol

>> No.2780870

>>2780830
That's not how anyone describes the voltage at two terminals. It isn't going in and coming out; it's there. Current flows into the cap and charges it, increasing the voltage you measure at the terminals. Yes, it's the voltage across the terminals, or at the terminals, or it's the capacitor voltage. But it's not going in and coming out. I'm not sure you know the difference between current and voltage, which is often the case with people learning about electricity. Go read about Ohm's law until it makes sense; it's about resistors, but that's a good place to start.

>> No.2780883

>>2780830
voltage doesn't go anywhere. Voltage is a difference in charge between two items.
It's like if I was standing on mount Everest and you were standing in a swamp, I would be higher in elevation than you. The elevation didn't 'go anywhere' it's just elevation, one place is higher than another. Voltage is the same, it's just a difference in electron charge. Current is electron flow, how many electrons are moving through a medium at a point in time. Current measures electrons going in or out of something.

>> No.2780903

>>2780759
so, nobody helps this guy and we just make fun of him?
nice going /diy/

>> No.2780914

Trickle charging a capacitor @2 amps takes about 24 hrs. Gives them a nice balanced charge.

>> No.2781038
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2781038

>>2780903
Yes. A serious answer would be completely wasted anyway.

>> No.2781069

>>2780903
It's safer this way, I don't need electrocuted OP on my conscience.