Benchtop DC Power Supply

prusaprinters

<h3>&nbsp;</h3><h3>Benchtop Powersupply</h3><p>&nbsp;</p><p>I built this power supply for my electronics projects. I mostly used modules so there is no need for building circuitry, the parts just need to be wired together.</p><p>The case is designed to be printed on the Prusa MINI.</p><h4>List of materials:</h4><ul><li>4 banana jacks</li><li>24V 8A SMPS</li><li>2 10 kohm potentiometers</li><li>2 500 ohm potentiometers</li><li>4 potentiometer knobs</li><li>100V 10A ammeter and voltmeter (like this one: <a href="https://www.aliexpress.com/item/1005003626996290.html?gatewayAdapt=glo2deu&amp;spm=a2g0o.search0304.0.0.11155ae8NCrp8C&amp;algo_pvid=9a9e0044-229b-45ce-882f-6fe42f0b2bec&amp;algo_exp_id=9a9e0044-229b-45ce-882f-6fe42f0b2bec-1)">https://www.aliexpress.com/item/1005003626996290.html?gatewayAdapt=glo2deu&amp;spm=a2g0o.search0304.0.0.11155ae8NCrp8C&amp;algo_pvid=9a9e0044-229b-45ce-882f-6fe42f0b2bec&amp;algo_exp_id=9a9e0044-229b-45ce-882f-6fe42f0b2bec-1)</a></li><li>300W step down convertor (buck convertor) with adjustable voltage and current limit (ex.: <a href="https://www.aliexpress.com/item/32807052041.html?spm=a2g0o.productlist.0.0.1cb54f02DkYZAn&amp;algo_pvid=faf4564a-77d8-4f66-96a6-5db7ff998594&amp;algo_exp_id=faf4564a-77d8-4f66-96a6-5db7ff998594-6&amp;pdp_ext_f=%7B%22sku_id%22%3A%2210000001106053546%22%7D&amp;pdp_pi=-1%3B2.63%3B-1%3B-1%40salePrice%3BUSD%3Bsearch-mainSearch)">https://www.aliexpress.com/item/32807052041.html?spm=a2g0o.productlist.0.0.1cb54f02DkYZAn&amp;algo_pvid=faf4564a-77d8-4f66-96a6-5db7ff998594&amp;algo_exp_id=faf4564a-77d8-4f66-96a6-5db7ff998594-6&amp;pdp_ext_f=%7B%22sku_id%22%3A%2210000001106053546%22%7D&amp;pdp_pi=-1%3B2.63%3B-1%3B-1%40salePrice%3BUSD%3Bsearch-mainSearch)</a></li><li>5mm LED</li><li>270 ohm resistor</li><li>on/off switch (SPST)</li><li>fuse holder</li><li>fuse</li><li>AC power plug connector + AC power plug cable</li><li>USB A breakout board</li><li>5V power adapter</li><li>M4 fork terminal crimp connectors</li><li>5.5mm ring terminal connectors</li><li>snap on terminal</li><li>stranded wire (thin)</li><li>stranded wire (thick) - from AC cable, for example</li><li>heat shrink tube - different diameters</li><li>flat head M3 screws</li><li>endseal terminals</li><li>screw terminal block</li></ul><h4>Tools:</h4><ul><li>soldering iron&nbsp;</li><li>flux and solder</li><li>wire cutter</li><li>wire stripper</li><li>terminal crimper</li><li>screwdriver</li><li>pliers&nbsp;</li></ul><h4>Printing the case</h4><p>I used PLA+ for all the parts.</p><p>The front panel requires a filament change so that the text is more visible.</p><p>If anyone wants to add some changes to the model, I have also attached the .f3d file for it.</p><h4>Assembling the electronics</h4><p>After desoldering the trimmers and bicolour LED from the buck converter, the circuit of the power supply can be constructed by following the schematic:</p><figure class="image image-style-align-center"><img src="https://media.prusaprinters.org/media/prints/125736/rich_content/cbeb6bbc-00ea-4f6e-a9f8-1cf735f8ac2f/ps_schematic-1.png#%7B%22uuid%22%3A%220d39651b-ebde-4a2e-8801-cc32745a9d30%22%2C%22w%22%3A2339%2C%22h%22%3A1654%7D"></figure><p>^attaches as PDF in files tab as well</p><p>&nbsp;</p><p>I have to add that I am not an expert so won't assume any responsibility for possible mistakes in my design.</p><p>&nbsp;</p><p>I hope that this project is somewhat helpful.</p><p>If you have any questions, feel free to leave them in the comment section.</p><p>I wish you ‘Happy 3D-Printing and Building!’</p>