SDG

[@sdgelectronics]

Earliest 100 people get an additional $10 OFF $10 coupon: www.allpcb.com/?code=yt40 Micsig CP2100 Current Probe: s.click.aliexpress.com/e/_DBRS9Fr Micsig DP10007, DP10013, DP20003 Differential Probe: s.click.aliexpress.com/e/_DkXKk1X Picoscope MSO5000 Series: www.picotech.com/oscilloscope/5000/flexible-resolution-oscilloscope Seeed Wio-E5: www.seeedstudio.com/LoRa-E5-Wireless-Module-p-4745.html

[@IanScottJohnston]

Nice job remembering to solder through hole IC's correctly.....alternating pins or swapping sides rather than heat destroying down one side and then the other. Note also lack of IC socket, probably a good idea given it's mains powered. Love the matt green Pcb.

[@TheEmbeddedHobbyist]

Never killed a chip yet by soldering it in, maybe i'm just too fast with the iron. if they can take wave soldering then they should be ok with me. 🙂

[@andycrask3531]

Surley he ment about replacing it in the future?

[@sdgelectronics]

It used to be what was taught, but I'm not sure if it ever really made much difference. I still do it for any fancy IC though

[@TheEmbeddedHobbyist]

@@sdgelectronics well I suppose I was never taught to solder other than having ever joint inspected. Got a slap on the wrist for each bad joint, and all the women having a good fun ribbing me for not being able to be as good as them. I was 16 and the only guy in the room, you had to be good to work with them so I had to learn fast. I was in the aircraft department where the control panels that went into fighter jet cockpits were made. So I learnt on the job how to solder, lace cableforms, and assemble a lot of wires and pcbs in a small space.

[@andymouse]

@@TheEmbeddedHobbyist me neither but easy change so swings and roundabouts...squeak !

[@Pacmania100]

The old LNK302-LNK306 series are still my favourites.

[@TheEmbeddedHobbyist]

nice little design, far better than a cap job.

[@lmamakos]

That matte finish of the solder mask in combination with the high quality silkscreen came out looking really nice on that PCB!

[@jaro6985]

killer soldering montage 👍

[@m1geo]

I'd love to see you explore the EMC issues around these. Keeping the quiet, etc.

[@allthegearnoidea6752]

Lovely video absolutely interesting. Thanks.

[@andymouse]

Awesome video Steve I will be checking out the Power Integrations site. The matte green PCB looks gorgeous with the ENIG so I think I shall give AllPCB a shot too. Do you mean there's a risk of shock at the low side should there be a fault condition due to no isolation ?....cheers

[@sdgelectronics]

Yes, especially where there's a chance for using non-polarised AC connectors/plugs. For example with 2-pin Fig 8 plugs or European 2-pin plugs you could swap the AC connections and the 230V would be passed straight through to the output. Even in normal conditions, if the MOSFET in the LNK3204 failed, you'd get 230V on the output too.

[@wthornton7346]

Thanks.

[@matusekpetr7806]

Nice project continuation Steve. Didnt you considered placing Varistor across mains ? LNK chips are common failure part in domestic appliances, i´ve heard they dont like any HV spikes.

[@sdgelectronics]

Yes, I bought a bag of them for this project. Just forgot to add it on the prototype.

[@ivolol]

Wouldn't mind seeing the ripple current produced on the voltage rails as well.

[@yasirhassan8557]

Very thorough setup and calculations. Still, I do have a question, is this chip/system OK for consumer grade product?

[@andrey00756845585]

Q: is this chip/system OK for consumer grade product? A: Yes, it is if you have the electronics fully enclosed, like a LED light bulb for example.

[@espenlyngaas9502]

@@andrey00756845585 It may need further filtering on the AC side, and perhaps a TVS/MOV, to be compliant. Nice video!

[@sdgelectronics]

@@espenlyngaas9502 MOV is the only thing missing. The LC filter should be fine for everything else on a low power supply like this.

[@Mr.Leeroy]

there is no power factor correction, so depends on the product

[@espenlyngaas9502]

@@sdgelectronics Ah yes, I missed L1 and friends

[@Mr.Leeroy]

Looking forward to anything EE/SE, except review content.

[@costarich8029]

Great video! I am looking forward to the future video that addresses isolation. Not that they care, but I think PI chose a terrible font for the name of their Excel spreadsheet tool. I had to copy it into a text editor and uppercase it to be certain it actually says PIXLS.

[@sdgelectronics]

Ah that makes sense - I forgot that's what it was supposed to be. I went on a training course too long ago to remember!

[@SidneyCritic]

How much was the cap-drop using, my busted brain is saying 220mA-ish - lol -.

[@sdgelectronics]

I think it was around 53 mA all the time, but almost 90 degrees out of phase with the AC voltage.

[@gordoncreAtive]

I like the music during soldering. What's that song called?

[@sdgelectronics]

"India Fuse"

[@nassim6925]

Hello 👋👋

[@stevenbliss989]

You results show way worse efficiency than the graph on the data sheet, what do you think is the reason?