Robot Power Supply

thingiverse

Without a doubt this is the most useful robot I designed so far. This is basically an old 12v wall-wart I found in my drawer, an adjustable buck convertor and a volt/amper meter - together they become a very usable power supply for my crazy electronic projects. This adjustable power supply has 2 banana terminals (one +, one -), 4 connectors for jumper wires (2 +, 2 -) an ampermeter and a voltmeter. Read the instruction below carefully, assembling this is a bit tricky - the knob is very hard to connect after the buck converter in already in its place. Designed with SketchUp, fixed with Microsoft 3D Builder, sliced with Cura and printed in PLA on my Robo3D R1+ Parts: Some kind of power supply with a 5.5mm plug A 5.5mm socket (from AliExpress "5pcs/lot High Quality Socket Female Panel Mount Connector 2.1mmx5.5mm Plug Adapter 2 Terminal types for DC Power Supply Jack") A DC/DC buck convertor, the only model that will fit is the one in the picture (from AliExpress "1pc Small LM2596 power supply module DC/DC BUCK 3A adjustable buck module regulator ultra LM2596S 24V switch 12V 5V 3V Newest") An amper/volt meter (from AliExpress "1pcs Professional DC 100V 10A Voltmeter Ammeter Blue + Red LED Amp Dual Digital Volt Meter Gauge") A power switch (from AliExpress "Free shipping Hot 5pcs AC125V 10A 250V 6A 2 Pin ON/OFF I/O SPST Snap in Mini Boat Rocker Switch") Red/black banana plugs (from AliExpress "Electrical Supplies 4PCS / 2 Pairs Speaker Amplifier Terminal Binding Post Banana Plug Socket Female Connector") Two short Dupont female-female jumper wires Some electrical wires Printing/Assembly: First print knob1 (no support, 100% infill), just as the print is finished while it is still hot squeeze the flat piece in the center with a pair of tweezers to make it thinner Now print knob2, back and the body with high infill (no support) Make sure Knob 1 and knob 2 fit together, connect and disconnect them a few times Print the head and arms with low infill, no supports Cut the two jumper wires in the middle so you have 4 wires with a female connector on one side Insert the 5.5mm jack into the hole in the right arm Solder the thin red wire from the amper meter + another wire to the buck converter IN+ Solder the thick black wire from the amper meter into the buck OUT- Solder two more wires, one to the buck's IN- and one to the OUT+ Press the smaller knob 2 firmly into the buck's potentiometer, it should fit like a screw driver into the potentiometer screw Carefully place the buck between the 4 columns inside the body so that the knob part goes into the round hole Carefully slide the back part into the slots in the 4 columns, the little ledge goes in the lower end, use hot glue to hold everything in place Now, carefully (again) connect the outer part of the knob Soldering time, make sure you solder everything on the correct side of the body so things fit into their holes Solder the free wire from IN+ to the switch, then from the switch other terminal to the 5.5mm jack + Solder the wire from the IN- to the 5.5mm jack Solder the wire from OUT+ and the Amper meter thick red wire nd two of the dupont jumpers to the red banana Solder the last thick wire from the amper meter and the other two dupont jumpers to the black banana The amper meter thin black wire should be left unconnected Now push all the component so they snap into their holes Push the 4 DuPont connectors into the square hole between the two bananas, make sure the positive connectors are closer to the red banana and the negative to the black one Use some glue in the right shoulder so the arm doesn't come out when you disconnect the power cord Those were some long instructions, if you got this far leave a comment