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LM317 DC-DC Step Down DC Converter Circuit Board

₦ 2,000

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Description
The LM317 is a linear voltage regulator, not a DC-DC switching converter, and functions differently to step down voltage. A DC-DC switching converter, also known as a buck converter, typically offers higher efficiency, while the LM317 provides a more stable, low-noise output suitable for sensitive electronics.
LM317 linear voltage regulator circuit boards
The LM317 adjustable linear regulator is available on small circuit boards, often featuring a potentiometer for easy output voltage adjustment. These are simple to use for hobbyists and professionals who need a low-ripple, regulated DC voltage.
  • LM317 DC-DC Step Down DC Converter Circuit Board (Generic): Available on sites like Nerdshed, this module includes the LM317 IC and a potentiometer.
    • Input voltage: 4.2V–40V.
    • Adjustable output voltage: 1.2V–37V.
    • Maximum output current: 1.5A (typical).
  • LM317 Adjustable Linear Regulator Module: Sold by Electra Store, this board is a good example of a linear regulator module intended for applications where low noise is a priority.
    • Input voltage: 4V–40V DC.
    • Adjustable output voltage: 1.25V–37V.
    • Maximum output current: 1.5A (continuous 1A recommended). 
Comparison: LM317 vs. switching DC-DC converters:
The distinction between linear regulators like the LM317 and switching converters is critical for your project’s power efficiency and heat management.
Feature LM317 Linear Regulator Switching DC-DC (Buck) Converter
Efficiency Lower efficiency, especially with large input-output voltage differences. Excess power is dissipated as heat, requiring a heatsink for higher currents. High efficiency, as it switches on and off to regulate voltage, reducing power loss.
Noise Produces very low electrical noise (ripple), making it ideal for sensitive analog circuits, audio, and radio-frequency projects. Generates more electrical noise due to its high-frequency switching action.
Heat Dissipation Can generate significant heat, especially when the input voltage is much higher than the output voltage. Requires a heatsink for high-current applications. Generates very little heat, even when dealing with large voltage differences.
Circuit Complexity Very simple to use, requiring just a couple of external resistors for a basic circuit. More complex circuitry involving an inductor, diode, and control IC, though pre-built modules simplify this.
Dropout Voltage Has a higher “dropout” voltage (the minimum difference between input and output voltage), typically around 2V to 3V. Can have a much lower dropout voltage, allowing for regulation even when the input and output voltages are close.
When to choose an LM317:
Opt for an LM317 circuit board if your project requires:
  • Low noise: For powering sensitive audio or analog circuits.
  • Simplicity: A straightforward, reliable voltage regulation solution that is easy to implement.
  • Moderate current draw: You are operating at lower currents where heat dissipation is less of a concern.
Alternative: Switching DC-DC buck converter:
If high efficiency is the most important factor for your application, such as in battery-powered devices, you should use a dedicated buck converter module instead. These modules are readily available from electronics retailers
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