{"product_id":"lm317-adjustable-dc-power-supply-diy-kit-1-25-37v-1-5a-electronics-teaching","title":"LM317 Adjustable DC Power Supply DIY Kit — 1.25–37V 1.5A, Electronics Teaching \u0026 Training","description":"\u003ch2\u003eLM317 Adjustable DC Power Supply DIY Kit — 1.25–37V, 1.5A, Electronics Teaching \u0026amp; Training\u003c\/h2\u003e\u003cp\u003eThis LM317-based adjustable DC power supply DIY kit teaches the fundamentals of linear voltage regulation through hands-on PCB assembly. Using the LM317T adjustable positive voltage regulator, the completed circuit provides 1.25V to 37V output at up to 1.5A, adjustable via an onboard potentiometer. The kit includes all components, a pre-drilled PCB, and is ideal for electronics students, hobbyists, and anyone learning about voltage regulation, resistor dividers, and PCB soldering.\u003c\/p\u003e\u003ch3\u003eKey Specifications (Completed Circuit)\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRegulator IC\u003c\/td\u003e\n\u003ctd\u003eLM317T (TO-220)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Voltage Range\u003c\/td\u003e\n\u003ctd\u003e1.25V – 37V (adjustable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMax Output Current\u003c\/td\u003e\n\u003ctd\u003e1.5A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInput Voltage\u003c\/td\u003e\n\u003ctd\u003eVin = Vout + 3V minimum (max 40V)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRegulation Type\u003c\/td\u003e\n\u003ctd\u003eLinear (low noise, no switching)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdjustment\u003c\/td\u003e\n\u003ctd\u003eOnboard potentiometer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection\u003c\/td\u003e\n\u003ctd\u003eInternal current limiting, thermal shutdown (LM317T)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput Ripple\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;1mV (linear regulator, very low noise)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eLM317 Voltage Setting Formula\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eR1 (fixed)\u003c\/th\u003e\n\u003cth\u003eR2 (adjust)\u003c\/th\u003e\n\u003cth\u003eOutput Voltage\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e240Ω\u003c\/td\u003e\n\u003ctd\u003e0Ω\u003c\/td\u003e\n\u003ctd\u003e1.25V (minimum)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e240Ω\u003c\/td\u003e\n\u003ctd\u003e1kΩ\u003c\/td\u003e\n\u003ctd\u003e~6.5V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e240Ω\u003c\/td\u003e\n\u003ctd\u003e2.4kΩ\u003c\/td\u003e\n\u003ctd\u003e~13.75V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e240Ω\u003c\/td\u003e\n\u003ctd\u003e5kΩ\u003c\/td\u003e\n\u003ctd\u003e~27V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e240Ω\u003c\/td\u003e\n\u003ctd\u003eMax pot\u003c\/td\u003e\n\u003ctd\u003eUp to 37V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003cp\u003e\u003cem\u003eFormula: Vout = 1.25 × (1 + R2\/R1) + IADJ × R2, where IADJ ≈ 50μA (negligible)\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eLM317 Linear Regulator vs LM2596 Buck Converter\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eFeature\u003c\/th\u003e\n\u003cth\u003eLM317 (linear)\u003c\/th\u003e\n\u003cth\u003eLM2596 (switching)\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutput noise\u003c\/td\u003e\n\u003ctd\u003eVery low (\u0026lt;1mV)\u003c\/td\u003e\n\u003ctd\u003eHigher (switching ripple)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEfficiency\u003c\/td\u003e\n\u003ctd\u003eLow (Vin−Vout × Iout = heat)\u003c\/td\u003e\n\u003ctd\u003eHigh (75–90%)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHeat generation\u003c\/td\u003e\n\u003ctd\u003eHigh at large Vin−Vout\u003c\/td\u003e\n\u003ctd\u003eLow\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBest for\u003c\/td\u003e\n\u003ctd\u003eAudio, RF, ADC, noise-sensitive circuits\u003c\/td\u003e\n\u003ctd\u003eBattery-powered, high-current, efficient\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eLearning value\u003c\/td\u003e\n\u003ctd\u003eHigh (teaches regulation fundamentals)\u003c\/td\u003e\n\u003ctd\u003eLower (IC handles everything)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eWhy Choose This LM317 DIY Kit?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eHands-on learning\u003c\/strong\u003e — teaches voltage regulation, resistor dividers, capacitor filtering, and PCB soldering\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLM317T regulator\u003c\/strong\u003e — industry-standard IC with comprehensive datasheet and application notes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1.25–37V adjustable\u003c\/strong\u003e — covers most low-voltage DC supply needs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVery low output noise\u003c\/strong\u003e — linear regulation ideal for audio, RF, and ADC power supply applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll components included\u003c\/strong\u003e — no additional parts needed, solder and use\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: What input voltage do I need for this LM317 kit?\u003c\/strong\u003e\u003cbr\u003eA: LM317T requires a minimum 3V dropout (Vin − Vout ≥ 3V). For a 5V output, use at least 8V input. For a 12V output, use at least 15V input. Maximum input is 40V. Use a DC adapter or transformer + bridge rectifier as the input source. The kit does not include a transformer or AC-DC rectifier.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Why does the LM317 get hot during operation?\u003c\/strong\u003e\u003cbr\u003eA: LM317 is a linear regulator — it dissipates the voltage difference as heat: P = (Vin − Vout) × Iout. At 12V input, 5V output, 1A: P = (12−5) × 1 = 7W. This requires a heatsink on the LM317T TO-220 package. Always attach a heatsink when operating above 500mA or with large input-output voltage differences.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Can I use this kit as a bench power supply?\u003c\/strong\u003e\u003cbr\u003eA: Yes — the completed kit functions as a simple adjustable bench supply. For a complete bench supply, add a voltmeter (0.28\" LED panel meter) to monitor output voltage, a current meter for load current, and an input from a 24–40V DC adapter. The LM317 kit provides the regulation stage; add input filtering and output protection as needed.\u003c\/p\u003e\u003ch3\u003ePackage Contents\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e1× LM317 Adjustable Power Supply DIY Kit (all components + PCB, unassembled)\u003c\/li\u003e\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":46991468757227,"sku":"\u003cnone\u003e","price":25.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/lm317-adjustable-power-supply-diy-kit-dc-voltage-regulator.webp?v=1761718661","url":"https:\/\/keszoox.com\/products\/lm317-adjustable-dc-power-supply-diy-kit-1-25-37v-1-5a-electronics-teaching","provider":"Keszoox","version":"1.0","type":"link"}