eBay EZM328 ESR meter case

thingiverse

This design serves as a case for an ESR meter (transistor/resistor/capacitor/diode/inductor) purchased from eBay. It can be bought as a kit or ready built (the latter is recommended due to the price). These eBay clones are based on Karl-Heinz Kübbeler's work, and his page contains full details including a manual that explains its operation: https://www.mikrocontroller.net/articles/AVR_Transistortester. You can find my design in Onshape where you can copy it and edit it: https://cad.onshape.com/documents/4c7d857a2b899b8391ab2a0b/w/a62ee55e23da096c7296b15e/e/1b39e92417e16c690e9eee98. The eBay title of the item I bought is: 2016 EZM328(GM328R)transistor tester/ ESR / frequency meter / square wave generator. A link is (which will probably expire, try searching for the above text): http://www.ebay.co.uk/itm/331800112138?_trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT. Print Settings Printer: Hictop Prusa i3 3DP-17 Rafts: No Supports: Yes Resolution: 0.2 Infill: 20% Notes: Support is needed for the top not the bottom. The PLA I used was not great and it only works at 0.2, head 210 degrees, bed 50 degrees. It took about three hours per part to print at approximately 32 meters of filament each. The case screws are M4 12mm; you could probably use similar self-tapping screws or modify the design. I drilled through the bottom holes to widen them slightly and let the M4 create a thread as they are screwed in. The two front PCB screws (I did not bother with the rear) were PC case screws for hard drives at approximately 3.4mm thread diameter and approximately 5mm long; any self-tapper or similar should do. The switch should be available easily or can be left off; I just cut the battery wire and soldered it to the switch. There are cutouts in the side for the probes that come with the kit. The bigger hole on the right side allows use of the ZIF socket lever and surface mount transistor testing pads.