230V power supply to Arduino

[Jan Gatzke]

@Magiske I am using a power supply similar to the black one. My one has a fake optocoupler. The output voltage is unregulated. Have a close look before using this pcb. ;)

[Roberto Brunialti]

May be too big or too expansive... but it is for sure a good (and safe...) product with a 33x22 mm footprint..

http://www.mouser.com/ProductDetail/RECOM-Power/RAC01-33SC/?qs=waQl70lBfV2Z5QQrs%2FIAaw%3D%3D

[Jan Gatzke]

Does it fit on 2.54 mm prototype boards?

[Didi]

Yes it does.
Look data sheet http://www.mouser.com/ds/2/468/RAC01_02-SC-16262.pdf

[Roberto Brunialti]

I've got a couple of them (3.3 and 5 V models), the wired models. Just received. Still to test...

[scalz]

you can disassemble some components like transformer and cap. So you can make your own mysensors design and you get very small and cheap transformer. I can't find cheaper I think. or maybe on alibaba!
I have these http://fr.aliexpress.com/item/AC-220V-DC-3V-10V-5V-9V-1w-1x1w-2w-2x1w-3w-3x1w-Constant-Current-Constant/1900256299.html?recommendVersion=1

[msebbe]

@scalz said:

you can disassemble some components like transformer and cap. So you can make your own mysensors design and you get very small and cheap transformer. I can't find cheaper I think. or maybe on alibaba!
I have these http://fr.aliexpress.com/item/AC-220V-DC-3V-10V-5V-9V-1w-1x1w-2w-2x1w-3w-3x1w-Constant-Current-Constant/1900256299.html?recommendVersion=1

Can this convert 230v to 5v and supply enough power for say an pro mini with motion sensor?

[scalz]

@msebbe : yes it can.

[Moshe Livne]

@scalz these are constant current. how come they supply constant voltage?

[scalz]

@Moshe Livne: when I tested it, it was with atmel standalone. So I added a voltage regulator. And you can add a little filter if you want..

[Moshe Livne]

@scalz Oh I see. Thanks!

[axillent]

@scalz said:

I have these http://fr.aliexpress.com/item/AC-220V-DC-3V-10V-5V-9V-1w-1x1w-2w-2x1w-3w-3x1w-Constant-Current-Constant/1900256299.html?recommendVersion=1

I'm using similar one, it is also called 3 x1 W Led driver and by my measurements provides 300mA and 17V without load

I use 220uF to filter its output and I use 78L05 to regulate down to 5V. This can give up to 5V@40mA output. The restriction is a heating desipation rating for 78L05.
For higher loads I would recomment to use DC stepdown. With DC stepdown you can get up to 5V@650mA with 80% efficiency

[scalz]

Sorry for my imprecision. So I agree with @axillent . If it is just for a motion, it should do the trick. But for higher loads, you should add a dc dc step down or use a better thing.

[themoloch]

@axillent said:

if you know what you are doing it is also other choice - linkswitch chips LNK302/304/306. The last one can deliver up to 350mA not isolated power directly 5V or 3.3V. It is as efficient as isolated - unloaded it will consume about 0.2W. A bit bigger than SR036. Easy to construct because you do not need custom transformers. For example Duwi zwave wall switches are using this type of the supply. This is my one side SMD version with regulated output:

Hello axillent, I just bought some of those LNK306 and would like to make a test board, could you share your schematic or components you used to make your own?

Thanks a lot.

[axillent]

@themoloch sure
I'm using a standard schematic from the datasheet. It is also a separate application note exists with recommendation on how to optimize input filter for low loads. The board on the picture for example uses 2x1uF + 2x1uF + 1mH as input filter

[Stefan Schreiter]

@themoloch said:

@axillent said:

if you know what you are doing it is also other choice - linkswitch chips LNK302/304/306. The last one can deliver up to 350mA not isolated power directly 5V or 3.3V. It is as efficient as isolated - unloaded it will consume about 0.2W. A bit bigger than SR036. Easy to construct because you do not need custom transformers. For example Duwi zwave wall switches are using this type of the supply. This is my one side SMD version with regulated output:

Hello axillent, I just bought some of those LNK306 and would like to make a test board, could you share your schematic or components you used to make your own?

Thanks a lot.

Can you give me please the schematic and BOM of your LNK Circuit?

[ahmedadelhosni]

@axillent Hello. It is an old topic but I am really interedting in your designs and want to know how stable are they after 1 year.

I have two question please.

• I am desiging the LNK pcb layout but I am a bit confused regarding safety. Pad size ? Trace width ? Ground plane for heat sink ? All these stuff. You mind sharing your design please ?
  Also I dont see a fuze or MOV in your design. Aren't they important ?

• you posted above 4 circuit deaigns. regarding the final chinese cheap design, what are the advantages and disadvantages of that design. I have just saw it in a cheap LED lamp.

Thanks.

[diegolf]

@axillent
Hello my friend! Can you share the schematic and BOM of this LNK circuit, please? I tried to follow LNK Datasheet, but is different of your Project...

thx

[Stephan]

Hello, I return to this topic which dates a bit.
I am very interested in the version that uses the LNK306.
I found this electronic diagram that uses LNK306

Could you provide a detailed nomenclature?
Thank you in advance.

Best regards.

[croc]

@themoloch Hello can you please tell me which 1uf you bought? because you have them in parallel and what is the maximum Am you can get out of them. regards from croc.