[how many 10v leds for 230AC and a few other questions.]

Electronic engineer
then i suppose that it's that i'm going to "be".

The base education for this is the SSI (Str

[how many 10v leds for 230AC and a few other questions.]

Okay thanks alot for your fast and helpfull replies :D
The resistor value were a theoretical question.

All my problems (so far) have been solved :)

Thanks for the help :D


Im starting an electrician education soon, and i think you guys will be able to help me alot if i encounter any problems, and i hope i will be able to help other beginners like me eventually.

[how many 10v leds for 230AC and a few other questions.]

Oh i'm so stupid.. i just came to think of it..

We soldered resistors on every LED before mounting them in the case for testing. i cant remember which ones tho, but i can calculate the resistance with a formula i found..

Say if i had 1k resistors and i needed 10k resistors.. could i then connect them in series and make up 10k or would they simply count as 10 1k's  and blow up?

[how many 10v leds for 230AC and a few other questions.]

Hey again. Thanks for your replies, they're helpfull.

Well all i know about those LEDs are that they are used for making a light testing thing for cars to check if the trailer lights works or if its the cars wiring. and the cars are using 12v batteries.

But yes of course, i didn't even thought of the AC and DC :) .

I have both green, red, and yellow LEDs.

I just thought of using those leds for making a, well.. Really bright lamp and i tend to use my old cell phone charges for the power source but i ran out of those. So i thought of making a ''real lamp'' which would be plugged in to the outlet.

are there any way of checking if the LED have internal resistors?

[how many 10v leds for 230AC and a few other questions.]

Hey all. I didn't know where to post this question so i thought i would post it here.

Well my question is as follows. I have a 230v AC outlet, how many 10v (or perhaps they're 12v i'm not sure tbh.) do i have to use to make sure that they don't blow up? And will i have to set them all in a parallel or serial connection?

And while i'm at it.

I have some old electronics laying around, can i unsolder the resistors, capasitors etc. and use them for my future projects?
Oh, and, just came to my thoughts. There is alot of guides how to make 12v to 24v or so. does anyone have guides for the opposite? Making 230v to say.. 12v?  ::)


If i explained my problem poorly, please tell me and i'll try to rephrase it.
Thanks in advance.

[need help creating a simple circuit.]

So in serial connections you add all the bulbs voltage, and use that as a pinpoint for power and in parallel you only need the individual bulbs power.

Thanks alot, you have really helped me out :)

[need help creating a simple circuit.]

I got 5 bulbs, and the bulbs are like this:
E-10 \ 10V \ 50 mA \ 0.5 W

Would it matter how i connect the wires whether its serial or parallel?

[need help creating a simple circuit.]

Hi everyone, i'm pretty new to electronics and i have a question.


Well first of all, i made a simple light circuit with 10v bulbs. and as i don't have any resistors i took my old phone charger wich outputs 4,9v. Connecting it to the outlet, i figured that the lights don't get enough power.

but if i were to remove the charger and make a normal plug for it, i suppose all the bulbs would be burnt, as the outlet gives 230v.

so what can i do to make this work?

- Thanks in advance.

-- sorry if my english isn't easy understanding. I'm a dane ::)