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Earth Bondhon
Last updated: Jun 12, 2026

5V Voltage Regulator

Build a stable 5V DC power supply using the LM340 voltage regulator. Ideal for microcontroller circuits and small electronics projects.

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Components List

Single phase Light

LM340 Voltage Regulator

Fixed positive voltage regulator (commonly 5V, 12V, 15V)

Single Phase DP ELCB

0.47µF Capacitor

Medium-value film or ceramic capacitor for AC/DC circuits

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5V Voltage Regulator

Build a stable 5V DC power supply using the LM340 voltage regulator. Ideal for microcontroller circuits and small electronics projects.

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5v fixed voltage regulator

LM340 is a regulated voltage (regulated voltage = 5V) transistor that maintains a stable supply of power to the electronic components. It is usually applied in embedded systems, Arduino installations, and digital electronics. The LM340 was easy to use and relatively small, and with built-in protection, makes it simple to regulate voltage in anything DIY.

LM340 Voltage Output Formula:

Vout = 5V (Fixed for LM340-5.0)

Recommended Capacitor Values:

  • Input Capacitor: 0.33µF
  • Output Capacitor: 0.1µF
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lm340 voltage regulator circuit

The LM340 family is a very common voltage regulator that still sells as it offers a stable 5 volts output, making it suitable to drive microcontrollers, sensors, and digital circuits. It has numerous current ratings (LM340-5.0, LM340T-5, etc.), and it features thermal shutdown and short-circuit protection. The device helps in making circuits easy to design because it negates the use of a complicated regulation system. The LM340 is perfect for beginners and professional electronic designs with a good supply of power, with very few external capacitors.

5v voltage regulator lm340

Pin Function
Pin 1Input Voltage
Pin 2Ground
Pin 3Regulated 5V Output
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Frequently Asked Questions - 5V Voltage Regulator:

A fixed 5V linear voltage regulator IC used for stable power supply.
Connect Vin to input, GND to ground, and Vout gives regulated 5V.
Use 0.33µF at input and 0.1µF at output for stability.
Yes, it provides a clean 5V output suitable for Arduino boards.
Yes, functionally they are similar 5V regulators with slight variations.
Typically up to 35V, but check datasheet for your variant.
Yes, when current exceeds 500mA or under high input voltage.
Varies by model, commonly 1A or 1.5A.
Yes, for regulated 5V output from higher voltage sources.
Typically around 2V, so input should be at least 7V.
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