$1 in parts and $10 million in engineering later ...
Just finished watching the video.
Well those transistors are not cheap, maybe a little more then $1 for parts.
But the time spent in testing and engineering, the custom build generators, home made high voltage probe on the oscilloscope.
Hats off to you sir,
Truly a great accomplishment, and great work.
So what’s the lesson learned from this. Do they need to put better parts that are equal to or of higher value in front of the PTC’s and what they are rated for? So if the PTC is rated for X then why put transistors that can only handle C in front of them?
This kind of sounds like common sense now when I ask it like that. I’m not trying to over simplify it, but it might sound like that and I couldn’t figure another way to ask the questions.
That’s one impressive meter for sure, especially with the “Joe Touch” mod. Maybe you should start award levels now? The highest awarded would be to meet or exceed your modified meter testing results, but being stock with no mods or updated parts.
Questions, maybe a dumb one but I’ll ask it anyway.
First, how much can your high voltage scope probe handle, will you need to make a new one if meters start to handle more power then 15KV?
I recently tore down a dead USB QC capable power supply for a Lanova Yoga laptop and noticed spark gaps between the common mode choke on the AC input side. So I was wondering, what if they had still used the cheaper transitors but added some spark gaps on the PCB before them with proper insulation? Would or could this result in the same affect as the higher end transitors? Or am I thinking crazy thoughts?
Side Note: Great reference about USB switch mode power supplies. I found this page full of good information. Since I never repaired a USB power supply (or any power supply) I went searching and found this page to be full of good info:
http://lygte-info.dk/info/SMPS%20workings%20UK.htmlThanks again for all the hard work, great testing and time spent editing and doing these videos.
Maybe now it’s time to take a break.
Scott