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LCR-T4 Case

by stanoba Dec 20, 2015
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Problem. Unsurprisingly, boards can vary some - my holes are slightly farther apart than yours, and the button and ZIF socket and screen, to - by 1.5mm or so (and it isn't my printer: I looked at the stl files).

However, the SKP file in the .ZIP is empty, and I haven't (yet) found a way to download just the SKP files from "Thing Files". I tried, but it gives me a little XML "Access Denied" result.

HALP! :)

Hi Jay, try again. I have re-uploaded sketchup file, because it was corrupted by Thingiverse.

Much better. Thanks so much for the rapid response. I suspect the file was there OK before, but somehow the access control made it inaccessible.

Thanks for you project, did you replace button with rotary encoder yourself?

Yes, I have followed official project document https://www.mikrocontroller.net/wikifiles/8/8f/Ttester_eng111k.pdf on page 11. After replacing microswitch with rotary encoder I have flashed board with latest firmware from here https://www.mikrocontroller.net/svnbrowser/transistortester/Software/trunk/ (folder mega328_T3_T4_st7565)

Awesome design! You happen to have the part number for the rotary encoder and knob?

Awesome, thanks for taking the time to reply back. Should be a fun little mod.

Woah that was complete comment, thank you.

can you make a case with room for three 18650 batteries a buck down and tp4056 li charger?

Hi, why three 18650 batteries? You can use one battery with step up (DC-DC boost) converter or buy li-ion battery ready tester like this http://www.ebay.com/itm/121530471473

Beside that 9V battery will last long enough.

I wanted to experiment with a long term sustainable system that was cheap.

3 18650's would probably be the least sustainable, most expensive way to do it. Lithium batteries don't do well when they're not being charged and discharged for long term periods of time. This thing draws such a low current, it would be as good as not using the 18650s. 18650's also cost between 3-10 dollars each.

If you want really good, long term power for this, either get a 9 volt wall plug adapter, or use 6 AAA or AA batteries. Just to compare, 9 volt batteries are around 500 mAh, while AA's are about 1000-2000 mAh. So running 6 AA in series to get the 9 volts will still last 2-4 times as long. And in reality, the lower the current draw, the better the battery performs, so it might even be better than that.