{"product_id":"lm317-power-supply-adjustable-voltage-regulation-module-digital-display-with-short-circuit-protection","title":"LM317 Power Supply Adjustable Voltage Regulation Module Digital","description":"\u003cp\u003eDiscover the LM317 Power Supply Adjustable Voltage Regulation Module Digital — a standout decor pick featuring adjustable design for dependable, everyday performance.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cp\u003eBrand Name: Aideepen\u003c\/p\u003e\u003cp\u003eCondition: New\u003c\/p\u003e\u003cp\u003eType: Module\u003c\/p\u003e\u003cp\u003eFeatures:\u003c\/p\u003e\u003cp\u003e1. The adjustable power supply circuit using the LM317 three-terminal adjustable voltage regulator IC is simple and reliable in performance.\u003c\/p\u003e\u003cp\u003e2. The LM317 current-expansion circuit module, by connecting an external high-power PNP transistor (TIP36), enables the LM317 to deliver up to 3A output current (requires a larger heat sink for the power transistor) and includes short-circuit protection.\u003c\/p\u003e\u003cp\u003e3. For small voltage drops and currents below 2A, the onboard heat sink suffices. If current exceeds 2A with high input\/output levels, replace the TIP36 PNP transistor with a larger heat sink.\u003c\/p\u003e\u003cp\u003e4. The module operates as a series voltage regulator circuit, adjusting the output voltage by modulating the conduction level of its internal switching transistor.\u003c\/p\u003e\u003cp\u003e5. Features short-circuit protection; brief output shorts will not damage components. Includes input rectification circuit for non-polarity input.\u003c\/p\u003e\u003cp\u003eProduct Specifications:\u003c\/p\u003e\u003cp\u003eDC Input: DC 5-30V\u003c\/p\u003e\u003cp\u003eAC Input: AC 3.5-21V\u003c\/p\u003e\u003cp\u003eDC Output: DC 1.25-27V\u003c\/p\u003e\u003cp\u003eMinimum Input-Output Voltage Drop: 3V (Step-down regulation; output is always lower than input)\u003c\/p\u003e\u003cp\u003eMaximum Current: 3A\u003c\/p\u003e\u003cp\u003ePCB Dimensions: 88mm (L) × 47mm (W)\u003c\/p\u003e\u003cp\u003eProduct Dimensions: 88mm (L) × 65mm (W) × 55mm (H)\u003c\/p\u003e\u003cp\u003eCircuit Principle:\u003c\/p\u003e\u003cp\u003eThe TIP36 transistor and resistor R4 form a current-limiting circuit. Resistor R5 serves as a sink resistor, ensuring the operating current within the LM317 circuit does not exceed the base current of the TIP36 transistor. Resistor R4 functions as a short-circuit protection resistor. During a short circuit, when current exceeds the limit value, the voltage drop across R4 increases, reducing the emitter-base voltage of the TIP36. This prevents the TIP36 from conducting. The current flowing through resistor R5 enters the LM317's input terminal. If the current exceeds the LM317's maximum output current, its internal overcurrent and overheat protection circuits activate. This automatically reduces the LM317's output current, achieving short-circuit protection.\u003c\/p\u003e\u003cp\u003eProduct List:\u003c\/p\u003e\u003cp\u003eKit 1:\u003c\/p\u003e\u003cp\u003eLM317 Power Regulator Module DIY Kit (Unassembled, Requires Self-Soldering)\u003c\/p\u003e\u003cp\u003eKit Contents (Shipping List):\u003c\/p\u003e\u003cp\u003ePCB Board * 1\u003c\/p\u003e\u003cp\u003e5.1K Resistor * 1\u003c\/p\u003e\u003cp\u003e120Ω Resistor * 1\u003c\/p\u003e\u003cp\u003e1N4007 Diode * 1\u003c\/p\u003e\u003cp\u003e2W 22Ω Resistor * 1\u003c\/p\u003e\u003cp\u003e5W 0.22Ω Resistor * 1\u003c\/p\u003e\u003cp\u003e5mm Red LED * 1\u003c\/p\u003e\u003cp\u003e104 Ceramic Capacitors * 2\u003c\/p\u003e\u003cp\u003e25V 10μF Capacitor * 1\u003c\/p\u003e\u003cp\u003e50V 470μF Capacitor * 1\u003c\/p\u003e\u003cp\u003e50V 1000μF Capacitor * 1\u003c\/p\u003e\u003cp\u003e5K Fixed-Leg Potentiometer * 1\u003c\/p\u003e\u003cp\u003ePotentiometer Cap * 1\u003c\/p\u003e\u003cp\u003eKF301-2P Terminal Block * 2\u003c\/p\u003e\u003cp\u003eM3*8 Screws * 3\u003c\/p\u003e\u003cp\u003eLM317 *1\u003c\/p\u003e\u003cp\u003e23*16*25 Heat Sink *1\u003c\/p\u003e\u003cp\u003eTIP36 *1\u003c\/p\u003e\u003cp\u003e50*45*18 Heat Sink * 1\u003c\/p\u003e\u003cp\u003eM3*6 Self-Tapping Screws* 3\u003c\/p\u003e\u003cp\u003eKit Two:\u003c\/p\u003e\u003cp\u003e1 x Pre-Assembled LM317 Power Regulator Module (Fully soldered, ready to use upon receipt)\u003c\/p\u003e\u003ch3\u003eOptions\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e LM317 Module, DIY\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003ch4\u003eQ: What is the LM317 Power Supply Adjustable Voltage Regulation Module?\u003c\/h4\u003e\u003cp\u003eA: The LM317 Power Supply Adjustable Voltage Regulation Module is a quality decor pick. The adjustable power supply circuit using the LM317 three-terminal adjustable voltage regulator IC is simple and reliable in performance.\u003c\/p\u003e\u003ch4\u003eQ: How do I use the LM317 Power Supply Adjustable Voltage Regulation Module?\u003c\/h4\u003e\u003cp\u003eA: The LM317 Power Supply Adjustable Voltage Regulation Module is ready to use right out of the box and makes an easy addition to your decor lineup.\u003c\/p\u003e\u003ch4\u003eQ: Why choose the LM317 Power Supply Adjustable Voltage Regulation Module?\u003c\/h4\u003e\u003cp\u003eA: The LM317 Power Supply Adjustable Voltage Regulation Module stands out in our decor range — The LM317 current-expansion circuit module, by connecting an external high-power PNP transistor (TIP36), enables the LM317 to deliver up to 3A output current (requires a larger heat sink for the power transistor) and includes short-circuit protection.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What is the LM317 Power Supply Adjustable Voltage Regulation Module?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The LM317 Power Supply Adjustable Voltage Regulation Module is a quality decor pick. 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