$10 DIY Variable DC Bench Power Supply
Description
I Was Able To Build Mine For $10.46 Because I Had Lots Of Used Parts Laying Around From Various Projects. However, The Parts List Below Shows Everything Needed. All I Needed Was The Display, Dc-Dc Converter Board, And The Potentiometers. The Switch Controls The Main 12V Power From The Power Adapter, Which Powers The Dc-Dc Converter Board And Fan When Switched On. The Dc-Dc Converter Board Uses Small Potentiometers, So I Desoldered Them And Replaced Them With Large Ones That Could Be Mounted Off The Board. The Left Potentiometer Is Voltage Control And Right Is Amp Control, As Seen [Here](Http://Kimgrity.Com/Images/Img_1935_04.Jpg). The Display Is Wired Like [This](Https://I.Ebayimg.Com/Images/G/Dlwaaosw0Knxg1Ko/S-L500.Jpg), Except That I Powered The Display On The Input Side Of The Dc-Dc Converter Board. And That'S It! Enjoy! Here The Parts: * [Dc-Dc Step Up Down Board | $3.17](Https://Www.Ebay.Com/Itm/Dc-Dc-Step-Up-Down-Boost-Buck-Voltage-Converter-Module-Lm2577S-Lm2596S-Power-N2/400985223988?Hash=Item5D5C94F334:G:Hhsaaoswgq9Vpikz) * [Digital Voltmeter Ammeter | $5.75](Https://Www.Ebay.Com/Itm/Mini-Dc-100V-10A-Digital-Voltmeter-Ammeter-Blue-Red-Led-Voltage-Amp-Meter-Gauge/322951112374) * [10K Potentiometer | $1.54](Https://Www.Ebay.Com/Itm/5Pcs-10K-Ohm-3-Terminal-Linear-Taper-Rotary-Audio-B-Type-Potentiometer/172618234352) * [Used 12V Power Adapter | $5.22 Or Cheap At Thrift Store](Https://Www.Ebay.Com/Itm/New-Ac-110-240V-To-Dc-12V-2A-Power-Supply-Adapter-Transformer-For-Led-Strip-Us/152337854739) * [Used 3D Printer Fan | $2](Https://Www.Ebay.Com/Itm/30Mm-5V-Cooling-Fan-For-Raspberry-Pi-And-Reprap-3D-Printer/142351923704) * [Used Alligator Test Leads | $4.54](Https://Www.Ebay.Com/Itm/10-Pcs-Dual-Head-Samll-Alligator-Crocodile-Clip-Test-Lead-Jump-Wire-5-Color-20/152902047801) * [1/2" X 1" Switch | $5.95](Https://Www.Ebay.Com/Itm/2X-Red-Led-Light-3-Pin-On-Off-1-2-X-1-Rectangular-Rocker-Switch-Ac-15A-250V/172808954640)
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