Bench top power supply - TFX, not ATX based

thingiverse

# CHANGE LOG ## 2021-03-16 - many people started notifying me, that rocker switches listed on BOM are too small and it's true. I mistakenly added link to 10x15 version. The correct size for switches is 15x21. I corrected the link in BOM already. Sorry guys! ## 2021-01-10 - added photo of used TFX power supply: the exact model is Fortron FSP250-60SBV - updated info about brass inserts in BOM (it is designed for M3 X D4.6 X L5.7) ## 2021-01-09 - STEP file added to allow you modify the project easily - Assembly guide added (please find attached pdf in files list) - added stl files for top and bottom lid - for those who don't want to cut them out from plywood - added pdf template for cutting the top and bottom lids - added melt-in brass inerts to the BOM # Disclaimer I did my best to make this design safe but overall I am an amateur and hobbyist. I can't guarantee you won't hurt yourself during making this thing, so if you feel uncomfortable to work with electricity, please don't start playing with it. As well, this is not laboratory power supply. I don't know the level of noise or any other parameters which is required for lab PSUs, so don't even think about this thing that way. # Introduction Bench top power supply built on top of an old TFX 250W power supply (you can probably by one on your local market for about $10-15) The design is inspired by the "Back Horn Speaker V2.0 BL2 - Bluetooth, Active, Passive" by guppyk (https://www.thingiverse.com/thing:4668173) # Bill of materials Product | Amount | Link --- | --- | --- Rocker switch (2 pin, 15x21) | 5 | https://s.click.aliexpress.com/e/_Aru962 Dual USB charger | 1 | https://s.click.aliexpress.com/e/_AmzlmT 12V LED rocker switch | 1 | https://s.click.aliexpress.com/e/_ANc8qP Step up buck converter | 1 | https://s.click.aliexpress.com/e/_9vhU95 Buck Converter CC CV 1.8-32V 5A Power Module | 1 | https://s.click.aliexpress.com/e/_Ac5D8P 0.56'' 0-100V 10A LED Digital Voltmeter Ammeter | 3 | https://s.click.aliexpress.com/e/_9vbHCJ Fuses (5x20, 10A) | 4 | https://s.click.aliexpress.com/e/_AaPtEL Fuse holders | 4 | https://s.click.aliexpress.com/e/_9jOzf9 Banana socket (red) | 4 | https://s.click.aliexpress.com/e/_AU55QT Banana socket (black) | 4 | https://s.click.aliexpress.com/e/_AU55QT 2x 22 Ohm 10W resistors or 1x 8 Ohm 50W resistor with heatsink | 2(1) | https://s.click.aliexpress.com/e/_AVklGr https://s.click.aliexpress.com/e/_9gjnQx IEC socket | 1 | https://s.click.aliexpress.com/e/_9xd9PH LM2596 step down converter (optional, for fan speed voltage control) | 1 | https://aliexpress.com/item/4000064597454.html Sunon 6010 12V fan | 1 | https://s.click.aliexpress.com/e/_A7tuKR Insulated connectors | 1 set | https://s.click.aliexpress.com/e/_AnuYWR Brass Hot Insert Nuts M3 X D4.6 X L5.7 | 12 | https://s.click.aliexpress.com/e/_A1hMur ||| Some of the above links are affiliate. If you feel uncomfortable with this try to search products on your own. # Assembly Please look at the Thing Files list for full guide  # Wiring Wiring scheme is included in files list (PDF) and on the preview images list. # Printing Prepare yourself for a long print. I am printing quite fast (about 100-120mm/s) and I was printing outer walls for about 14h on 0.28 layer height (0.4 nozzle).