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7805 DC 5V Regulator Module


The 7805 Module is a voltage-regulated power supply circuit board, which can convert an input voltage range of 7.5V to 24V AC or DC to a fixed positive 5V DC output at 1A of current.

This module comes with overheat and short circuit protection functions.

It can serve as an additional power supply for various electronic components such as Arduino boards, sensors, and charging modules. It can also be used to power LEDs (up to a maximum of 5 watts).

These module price typically ranged from $1 to $2.5, depending on the supplier and quantity purchased. It's always a good idea to compare prices from different suppliers to find the best deal.

This article will provide detailed information about linear regulator 7805 module, including specifications, circuit diagrams, working principle, applications, and more. Let's get started!

Specifications of 7805 Module

The quick specifications of the 5V regulator module is given below,

  • Type: Voltage Regulator
  • Model: 7805-DC-5V
  • Input Voltage Type: Both AC & DC
  • Input Voltage Range: 7.5-24V
  • Input Current: 1A
  • Output Voltage Type: DC
  • Output Voltage: Fixed +5V
  • Output Voltage Tolerance: 2% to 4%
  • Output Current: 1A
  • Temperature Range: –40°C to +125°C
  • Dimentsions: 6 x 4 x 1 CM
  • Wight: 3gm

7805 Module Circuit Diagram

Schematic of the 7805 dc 5v regulator module circuit is shown below.

Components are used - U1: IC 7805, D1 to D4: 1N7004 Diodes, C1: 470uF 50V Electrolytic Capacitor, D5: LED, R1: 1K Resistor, C2: 100uF 25V Electrolytic Capacitor, C3: 0.1uF Ceramic Capacitor, J1: Male 10-Pins, 2-Pin Connectors, and Aluminum Head-Sink.

Working Principle of 7805 Module

The main component of this regulated power supply module circuit is a positive voltage regulator IC called 7805. The 7805 is a monolithic integrated circuit designed to provide a fixed voltage output of 5V. Its working principle is based on regulating the input voltage and maintaining a constant 5V output voltage.

When the circuit receives an input voltage of 7.5-24V and 1A DC or AC, it passes through a diode bridge rectifier to convert it to DC. The resulting unregulated DC voltage is then smoothed and filtered by a capacitor (C1), which is indicated by an LED (D5).

Next, the voltage regulator IC (U1) regulates the unregulated DC voltage to a constant +5V DC output. Any extra voltage is dissipated as heat, so it's recommended to use a suitable aluminum heat sink.

Capacitors C2 and C3 are used for additional smoothing and filtering, and to reduce ripple noise from the regulated supply output. As a result, this power supply circuit provides a 5V 1A DC output.

Additionally, connector J1 is connected to the output in parallel to power any 5V electronic modules through jumper wires.

Application of 7805 Module

  • Constant +5V output regulator for powering microcontrollers and sensors in most projects
  • Charging modules (such as the TP4056 module)
  • Audio amplifier modules (such as the GF1002 module)

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