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MJ
Md Jony Islam
Last updated: Jun 12, 2026

5V to 1.5V Converter Circuit

Learn how to convert 5V DC to 1.5V using a simple step-down (buck) converter. Perfect for low-power electronics like sensors, LEDs, and microcontroller peripherals.

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Components List

5K Fixed Resistor

5K Variable Resistor

Adjustable resistor with 5,000 ohm resistance

13003 Transistor

13003 Transistor

NPN power transistor, high voltage switching

1µF Capacitor

1µF Capacitor

Fixed value, non-polarized/polarized capacitor

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5V to 1.5V Converter Circuit

Learn how to convert 5V DC to 1.5V using a simple step-down (buck) converter. Perfect for low-power electronics like sensors, LEDs, and microcontroller peripherals.

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dc to dc step down 5v to 1.5v

A step-down voltage regulator like LM317 or a buck converter IC can be used to make 5V into 1.5V. They are circuits where the voltage can be reduced, and on the 1.5V devices, which present a stable current source. They also help guard against overvoltage damage of low voltage circuitry and can be observed in battery-powered equipment and embedded systems. Heat management and selection of the components will give good performance.

Formula & Table Summary:

  • Using LM317: Vout = 1.25 × (1 + R2/R1)
  • Fixed Buck Converter: No external resistors needed, preset 1.5V output
  • Power Dissipation: P = (Vin - Vout) × Iload
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5v to 1.5v converter circuit

A 5V to 1.5V converter is a very basic DC-DC step-down (buck) circuit that is used in order to power low-voltage, 1.5V devices such as low-voltage WiFi sensors, or logic chips out of 5V power, such as USB. This circuit is quite efficient at controlling the voltage using a regulatable regulator such as the LM317 or a specific regulator IC such as a buck converter. This is usually applied in embedded systems, battery power equipment, and applications with microcontrollers.

5v to 1.5v regulator

Input Voltage Output Voltage Output Current Power Dissipation
5V 1.5V 500mA 1.75W
5V 1.5V 300mA 1.05W
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Frequently Asked Questions - 5V to 1.5V Converter Circuit:

Yes, with proper resistor values, LM317 can output 1.5V from 5V.
Typically around 80–95%, depending on the load and design.
Only if the LED forward voltage is ≤1.5V; otherwise use a resistor or boost.
Yes, many watches run on 1.5V and need low current, which this converter can handle.
Switching regulators are more efficient than linear for larger current loads.
Use a multimeter set to DC voltage across the output terminals.
For linear regulators under heavy load, yes. For switch-mode, usually not.
Yes, with a buck converter or LDO regulator like AMS1117-1.5.
Typically a regulator IC, input/output capacitors, and sometimes resistors.
Some ultra-low-power MCUs can operate at 1.5V, but most need ≥1.8V.
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