eBay EZM328 ESR meter case

thingiverse

This design is a case for an ESR meter (transistor/resistor/capacitor/diode/inductor) purchased from ebay. It can be bought as a kit or ready build (the latter is recommended for the price). These ebay clones are based on the work by Karl-Heinz Kübbeler, this 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 genera 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 3 hours per part to print at approx 32m 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 2 PCB screws (I did not bother with the rear) were PC case screws for hard drives at approx 3.4mm thread diameter and approx 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 cut outs in the side for the probes that come with the kit. The bigger hole on the right side allow use of the ZIF socket lever and surface mount transistor testing pads.