Emergency light variation 1

188

01:56:47

This circuit probes a power outlet to activate an emergency light when there is a power outage. I power my emergency light (LED strip) with a lead acid battery. I published two variations of this circuit, but prefer variation 2, because I hate optocouplers and I dont want to use so many capacitors.

This variation here uses capacitive voltage dividers to step down mains voltage to a measureable one. It also uses an optocoupler to isolate mains from the main circuitry. USING THIS OPTOCOUPLER IS DEFENTLY RECOMMENDED!!! ALSO MAKE SURE YOU HAVE A CASE AROUND EVERY COMPONENT BEING LEFT OF THE OPTOCOUPLER!!!

I got the idea to design such a circuit when I had my first mains voltage shock yesterday. The breaker opened immediately, so I sit in the dark, being dizzy as hell. It took me around 2 minutes to find a flashlight so I can turn off everyting to activate the breaker again. If you want to know why I was shocked: I was working with my autotransformer. To change the setup, I turned it's output down to 0V, but I did not unplug it. When I touched the neutral output of it, WAAAMMM. Seems like I have connected the phase of mains voltage to the neutral input which is shortened to neutral output. It was not a dumb mistake, but it was still pretty shocking.

published 6 years ago

Anukakerakt

6 years ago

Wow

hurz

6 years ago

not the overcurrent breaker opens, you are lucky you have a special breaker a so called RCD Residual Current Device. german (Fehlerstromschalter) Anyway, if you use an autotransformer always measure where is phase and which is neutral. But this is a good experience cuz you have survived but now you know how it feels and i guess you dont want to have that again.

LeButch

6 years ago

I guess everyone working with electronics has to do this experience at least once...

kiani

6 years ago

At least! Once? Right i go and try it right now,,

LeButch

6 years ago

No. I mean you have to make this experience not on purpose.

kiani

6 years ago

Then maybe chsnge the wording of your english sentence, cause it says thst yiu recommend the experience if electuc shock at least on one occasion.. I din't wabmnt to argue with you bucho, you can't accept your errors, ( at least from prople you have problem with)... Its upto you.,

LeButch

6 years ago

I cant accept a non-existant error. I said HAS TO. You do not have the choice, you HAVE TO make this experience at least once.

kiani

6 years ago

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