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Remote light switch power source

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Gyurex

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Hi!
I'm interested in, to build a remote light switch, I succesfully made the remote, but can't make the power source.
I'm planning to integrate into the existing switch's place, so interested in a solution, that is using the existing cables, no need another cable, because the cable channel is that thin, there's no place another one. I'm heard, that is possible, but don't know how. I'm using atmel's attiny mcu, so I need 5V.

Thanks in advance, and sorry for the bad english, I'm not a native english speaker.
 

It is the existing ligth switch's power source, 230V AC.
 

grab a cell phone charger (ebay) or from any where cheap...230VAC to 5V @ 1A. Easiest solution.

Remember, a simple working solution, is often the best solution.
 

Gyurex said:
Hi!
I'm interested in, to build a remote light switch, I succesfully made the remote, but can't make the power source.
I'm planning to integrate into the existing switch's place, so interested in a solution, that is using the existing cables, no need another cable, because the cable channel is that thin, there's no place another one. I'm heard, that is possible, but don't know how. I'm using atmel's attiny mcu, so I need 5V.

Thanks in advance, and sorry for the bad english, I'm not a native english speaker.
Click to expand...

If your current requirement is low (I don't think it's high, but you should clarify), you can use a capacitor-resistor-zener based non-isolated power supply. This is fine for low currents. The circuit makes use of the reactance of the capacitor. You need to be careful though, since the circuit isn't isolated and so can give a nasty shock.

8781145100_1376376130.png


Take a look at this:

Microchip AN954: Transformerless Power Supplies: Resistive and Capacitive
https://ww1.microchip.com/downloads/en/appnotes/00954a.pdf

Hope this helps.
Tahmid.
 
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    Gyurex

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This is helpful, thanks. But, what happen, if I turn on the light. And one more question, there's a small flowing current, that may make the energy saving bulbs blinking, because it's charges the inner capacitors, isn't it? If it correct, is there any way to solve this problem?
 

dude..you'll get your self killed..no joke. Stop messing with AC unless you have the right skill sets.

Go got a AC to DC mobile charger and thats your solution. Do include a fuse in series with the input..maybe some CM fitlering etc etc.

If you take away anything from this..it should be this: Natural Selection prevails above all.

Enjoy
 

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