Products > Test Equipment
An investigation about ripple current of Kunkin KP184
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torch:
Ok, circuit board porn:

Rear half of the top board


Front half:


Can't really make it out in the pic, but it says IRFP250M on the chip:


Top board revision:


Bottom board revision:


Front half of the bottom board, as near as I can photograph without further disassembly:


Rear half of same:


The rear board is only 1/2 width anyway. Chips bolted direct to the heat sink:


And the little switch board attached to the rear panel. This becomes important in the next post.



torch:
Like I said, I've been using it. Great addition to the bench, wish I had one years ago. But. That reaching around to the power switch is getting old fast. Time to do something about it:

As others have noted, the front panel is cast to hold something on the bottom right. I don't know if it was for a power switch or a USB port, but I thought this little guy would fit:





As it turns out, 13mm was perfect. 7mm was a hair too wide. I thinned the front panel plastic a hair with a Dremel tool, until it popped in snug and secure. After drilling a hole for the toggle, of course!



I had hoped to interrupt the supply to the transformer. However, they used a centre tap transformer, switched by the 120/140 switch at the rear. As I am on 120v mains, and as there is no way a wider switch would fit in that tiny pocket, I had to go for the point were Line met board. The socket's tab was actually just soldered to the side of that rear board so it was easy to desolder, bend slightly, solder one wire to the tab and the second to the board. Heat shrink all 'round, of course!



And here we go. No more reach-arounds for me!!!  ;D



Oh, and as for your question about price: I'm not in Europe. I bought one off Banggood. About CDN$250 all in after shipping, insurance and taxes.
Everbrave:
Thanks a lot for the great effort. However, the resolution of the pics is too low to read the MOSFET Typ Nr., do you mind writing it down?
Also, the Firmware version would be interesting.
As for the ripple form and magnitude, it’s quite different from my board V6. I can’t explain without schematics, which I couldn’t find anywhere.
Hamelec:
see above:
"Can't really make it out in the pic, but it says IRFP250M on the chip:"
torch:

--- Quote from: Everbrave on August 17, 2023, 08:48:48 am ---Thanks a lot for the great effort. However, the resolution of the pics is too low to read the MOSFET Typ Nr., do you mind writing it down?
Also, the Firmware version would be interesting.
As for the ripple form and magnitude, it’s quite different from my board V6. I can’t explain without schematics, which I couldn’t find anywhere.

--- End quote ---

As noted, the Mosfets claim to be IRFP250M. They look pretty convincing, I don't suspect counterfeits, but who knows these days?

The second line on boot is "2303" I assume that's the firmware version?
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