Hello folks!
I found some 6 months ago a very nice YouTube video about someone that designed and built a shield with a 300 VA pure sinewave inverter from 12 V (ArduiSine). The silkscreen has the markings "Design by HungPham" and "Made in Vietnam". I managed to download the .ino file, the gerber files and got the PCBs manufectured in China, but before starting assembly I'd like to have the schematics to help debug any errors. The problem is the link to it, that supposedly should be in the video comments, wasn't. I e-mailed Youkito1991@gmail.com that appears to be the autor of the video but got no reply.
So, if anyone has seen the video with the schematics, I'd be more than grateful if he/she could share the file. Also, if someone had built the inverter, please share the experience with us.
Looking forward to any help, regards,
Paulo Scheidegger
P.S. if somone is interested I can share the .ino and gerber files too, just ask for it.
Having looked a parts of the video, it seems to me that you should be able to deduce the schematic from the parts and the gerber files.
If you actually have the PCBs that makes it easier to just verify the traces with a DMM.
I really like the concept, the limitation of course being both the wattage of the mosfets and the wattage of the Coils.
Thanks for the answer, @Deva_Rishi.
Sure it can be done, I'd just liked to save some time and avoid any mistakes during the tracing.
I have never gotten a bad PCB built to my file! Note:that is not saying my file was correct but the board matched the file. I simply assembly the first one and try it. If there are problems they show up, if not I have saved a lot of time.
Here follows the schematic I could draw from the traces with the DMM. Unfortunatelly the DMM didn't tell me the values of the capacitor and resistors marked in the picture attached. This is why I was asking for some good Samaritan who could help me with a ready-made schematic.
There was an error in the previous schematic, here is the correct v 1.1
Looking at the video, the capacitor is marked 104, (denotes 10 + 4 zeroes) or 100,000pf, or in other words, 100nf. Its probably a 100v or 50v multi-layer capacitor.
I struggled a bit with the resistors but I think they might be 270ohm, 1% tolerance (red, violet, black, black, brown) but not 100% sure. Perhaps someone with sharper eyesight can confirm?
Thank you BitSeeker! I missed that video frame with capacitor value, would you mind telling me the exact time stamp of the frame?
For the resistors, I guess my vision is less sharp than yours... I'll revise my schematic with the values you gave until we got a better answer.
Thank you very much again.
My guess is that the value of your resistor does not matter much (anywhere from 100 to 1k will work).
Same for the capacitor. Anything from 47n till 200n will work.
Even values outside these ranges will probably work....
The timer text is very hard to read because the time line is obscured by the caption text and because of the high-res video (4K? 8k even?) the text at the bottom left is tiny! I managed a screen grab and enlarged it - I think its at the 4.20 mark. Its just after the JLPCB shout-out where he holds the board in his hand and rotates it. For a moment it reveals the side where the capacitor is.
Agreed. I don't think its too critical and something within those ranges should work.
