High Current Adjustable Power Supply with LM317 + 2SC5200 | Powerful DIY Voltage Regulator

In this video, we’ll show you how to build a high current adjustable DC power supply using a combination of the LM317 voltage regulator IC and a 2SC5200 NPN power transistor. This is a boosted LM317 circuit, ideal for powering high-current DC devices, DIY electronics projects, and bench power supplies where voltage adjustability and load capacity are essential.

🔌 Input Voltage: 12V – 30V DC
⚙️ Output Voltage: Adjustable from 1.25V up to near input level
🔋 Output Current: Boosted by 2SC5200 (up to several amps depending on heatsink)
📦 Main Components:

LM317 Adjustable Regulator

2SC5200 Power Transistor

10K Potentiometer

330Ω, 100Ω, 10Ω Resistors

🔍 How It Works:
The LM317 provides stable voltage regulation with fine adjustment using a potentiometer. However, it’s limited in current (usually under 1.5A). By adding the 2SC5200 transistor in parallel (controlled via resistors), we allow most of the load current to flow through the transistor — relieving the LM317 while still maintaining precise control of output voltage.

This setup is perfect for powering motors, high-power LEDs, Peltier modules, audio amplifiers, and other DC-powered devices that require a variable voltage power supply with high current.

✅ Applications:
DIY Bench Power Supply

Lab Power Source

Motor Speed Controller (DC motor)

LED Strip Brightness Controller

Battery Charging Circuit

Custom Voltage Source for Arduino, ESP32, or Raspberry Pi projects

⚠️ Tips & Safety Notes:
Use proper heatsinks on both LM317 and 2SC5200 to prevent overheating

Add an electrolytic capacitor at input/output for better filtering

Ensure current rating of your power supply and wires match your load

Always measure output voltage before connecting sensitive components

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Видео High Current Adjustable Power Supply with LM317 + 2SC5200 | Powerful DIY Voltage Regulator канала D.Electric