Adjustable Buck converter case

cults3d

Just a quick case I knocked up for the small adjustable buck converters. I use this for a Neopixel driver for a lighting project on my Tronxy X5S but it'll probably get used around my other printers after the success so far with the Tronxy. There are two versions, the first design had no vent holes and if you start running these things around the 3 Amp mark, despite their claimed efficiency of 95^, they do seem to get pretty warm. To that end I made a small modification and made an 8mm hole in the side and lid opposite the IC on the circuit board. I attached a small heatsink to the chip also. There is a small inductor which also gets warm but hoping that just the ventilation will keep things under control. It never tripped out on over-temperature before but good practice says some air circulation isn't a bad thing. You will require 4 x M3x16mm cap head screws to complete the box. A pair of 4mm countersunk holes are provided in the base for securing to equipment of your choice. I used M3 x 6mm countersunk and a pair of T-Nuts to secure to the 2020 extrusion on the Tronxy. Update. 05 July 2020. OK, for the folks that want to thrash this thing to the limits, I've created a lid design which has provision for a 20mm axial fan. The fan can be powered from either the output or 12 volt input and I have set mounting for pogo pins which make contact with the circuit board when the case is assembled but enable the lid to be removed, complete with fan without having to disconnect any wiring. Additional parts as follows: Fan 20mm x 6 5 Volt. https://www.aliexpress.com/item/4000475308726.html?spm=a2g0s.9042311.0.0.7bd24c4dZUNgg2 2.5mm x 13mm pogo pins : https://www.ebay.co.uk/itm/5Pcs-P953-13mm-Lenght-Spring-Loaded-Contact-Testing-High-Current-Probe-Terminal/362278799832?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 3 x M2 x 8mm cap head or mushroom head screws. (Local hardware). Post-Printing Assembly Instructions Once printed, I recommend cleaning the threads up before assembly with the circuit board. Use correct size screws and screw into the 4 M3 holes in the base and if chosen, the 4x M2 holes in the lid for the 20mm fan option. If you are using the pogo pins for fan power, separate sufficiently, the fan wires and pass them through the pogo pin holes from the top of the case lid. Ensure polarity and voltage (Supply or output) is correct before passing the wires through the holes. Solder the wires to the back face of the pogo pins, ensuring no excess solder or wire strands extend over the edges and trim as required. Push the pins into the holes until the 3.5mm shoulder is flush with the end of the pin housings. You can now fit the fan if not already done. When the lid is fitted, the pogo pins will make contact with the solder pads on the circuit board and supply the fan.