Engineers Garage

  • Projects and Tutorials
    • Electronic Projects
      • 8051
      • Arduino
      • ARM
      • AVR
      • PIC
      • Raspberry pi
      • STM32
    • Tutorials
    • Circuit Design
    • Project Videos
    • Components
  • Articles
    • Tech Articles
    • Insight
    • Invention Stories
    • How to
    • What Is
  • News
    • Electronic Products News
    • DIY Reviews
    • Guest Post
  • Forums
    • EDABoard.com
    • Electro-Tech-Online
    • EG Forum Archive
  • Digi-Key Store
    • Cables, Wires
    • Connectors, Interconnect
    • Discrete
    • Electromechanical
    • Embedded Computers
    • Enclosures, Hardware, Office
    • Integrated Circuits (ICs)
    • Isolators
    • LED/Optoelectronics
    • Passive
    • Power, Circuit Protection
    • Programmers
    • RF, Wireless
    • Semiconductors
    • Sensors, Transducers
    • Test Products
    • Tools
  • EE Resources
    • DesignFast
    • LEAP Awards
    • Oscilloscope Product Finder
    • White Papers
    • Webinars
  • EE Learning Center
  • Women in Engineering

Basic low pass filter using capacitor and resistor

By Ashutosh Bhatt

To avoid unwanted noise in the output, a filter is required to be placed before it. Such filters are more commonly used in audio circuits. To avoid or retain frequencies which are higher than filter’s cutoff frequency, a low pass filter is employed. It is also known as high-cut filter since it provides a difficult passage to high frequency signals from source to output as shown in this project. Low pass filter is used for signal decoding, audio amplifiers, and demodulators. Also, various consumer electronic gadgets like mobiles, speakers system, gaming consoles, digital image display units apply a low pass filter.


The low pass filter circuit which is the prime part of this project, filters a frequency spectrum or any mix of frequencies. The frequencies above the cut-off frequency of the circuit are bypassed to the ground by the capacitor C. This is a capacitive low pass filter which has a resistor connected in series and a capacitor in parallel with the output. The principle involved: the reactance of the capacitor is inversely proportional to the frequency applied, i.e., Xc = 1/WC . As the frequency increases, the voltage across capacitor C drops down. This means that the output decreases with the increase in frequency. Thus the frequencies above the cutoff frequency are effectively reduced in amplitude. The cutoff frequency is the design parameter of the filter and depends on the value of capacitor C and resistor R according to the relation, f = 1/2RC. 

Project Components

  • Capacitor
  • Resistor


Filed Under: Electronic Projects
Tagged With: filter, low pass filter
 

Questions related to this article?
👉Ask and discuss on Electro-Tech-Online.com and EDAboard.com forums.



Tell Us What You Think!! Cancel reply

You must be logged in to post a comment.

HAVE A QUESTION?

Have a technical question about an article or other engineering questions? Check out our engineering forums EDABoard.com and Electro-Tech-Online.com where you can get those questions asked and answered by your peers!


Featured Tutorials

  • Designing Gate Driver Circuit and Switching Mechanism for Modified Sine Wave Inverter – (Part 9/17)
  • Completing Modified Sine Wave Inverter Design with Full Bridge Circuit and Step Up Transformer – (Part 10/17)
  • Designing an Offline UPS – Part (12 /17)
  • How to reduce Switching Time of a Relay – (Part 15/17)
  • Testing MOSFET – (Part 16/17)
  • Driving High Side MOSFET using Bootstrap Circuitry – (Part 17/17)

Stay Up To Date

Newsletter Signup

Sign up and receive our weekly newsletter for latest Tech articles, Electronics Projects, Tutorial series and other insightful tech content.

EE Training Center Classrooms

EE Classrooms

Recent Articles

  • Designing Gate Driver Circuit and Switching Mechanism for Modified Sine Wave Inverter – (Part 9/17)
  • Completing Modified Sine Wave Inverter Design with Full Bridge Circuit and Step Up Transformer – (Part 10/17)
  • Designing an Offline UPS – Part (12 /17)
  • How to reduce Switching Time of a Relay – (Part 15/17)
  • Testing MOSFET – (Part 16/17)

Most Popular

5G 555 timer circuit 8051 ai Arduino atmega16 automotive avr dc motor display Electronic Part Electronic Parts Fujitsu ic infineontechnologies integratedcircuit Intel IoT ir lcd ldr led maximintegratedproducts microchip microchiptechnology Microchip Technology microcontroller microcontrollers mosfet motor powermanagement Raspberry Pi remote renesaselectronics Research robot samsung semiconductor sensor software STMicroelectronics switch Technology vishayintertechnology wireless

RSS EDABOARD.com Discussions

  • How did they made the old manuals or magazines sketches?
  • Bandpass filter why we are cascading HPF+LPF why not LPF +HPF,both are LTI systems
  • MAX5389 resetting by noise
  • Verilog/SV: Using an array as a set of individual registers and not RAM
  • the mysterious emitter follower

RSS Electro-Tech-Online.com Discussions

  • MOSFET gets hot and burns
  • LCD display on PICDEM 2 Plus board
  • Relaxation oscillator with neon or...
  • software PWM
  • Positive and negative sides of voltage source
Engineers Garage
  • Analog IC TIps
  • Connector Tips
  • DesignFast
  • EDABoard Forums
  • EE World Online
  • Electro-Tech-Online Forums
  • Microcontroller Tips
  • Power Electronic Tips
  • Sensor Tips
  • Test and Measurement Tips
  • 5G Technology World
  • About Us
  • Contact Us
  • Advertise

Copyright © 2022 WTWH Media LLC. All Rights Reserved. The material on this site may not be reproduced, distributed, transmitted, cached or otherwise used, except with the prior written permission of WTWH Media
Privacy Policy | Advertising | About Us

Search Engineers Garage

  • Projects and Tutorials
    • Electronic Projects
      • 8051
      • Arduino
      • ARM
      • AVR
      • PIC
      • Raspberry pi
      • STM32
    • Tutorials
    • Circuit Design
    • Project Videos
    • Components
  • Articles
    • Tech Articles
    • Insight
    • Invention Stories
    • How to
    • What Is
  • News
    • Electronic Products News
    • DIY Reviews
    • Guest Post
  • Forums
    • EDABoard.com
    • Electro-Tech-Online
    • EG Forum Archive
  • Digi-Key Store
    • Cables, Wires
    • Connectors, Interconnect
    • Discrete
    • Electromechanical
    • Embedded Computers
    • Enclosures, Hardware, Office
    • Integrated Circuits (ICs)
    • Isolators
    • LED/Optoelectronics
    • Passive
    • Power, Circuit Protection
    • Programmers
    • RF, Wireless
    • Semiconductors
    • Sensors, Transducers
    • Test Products
    • Tools
  • EE Resources
    • DesignFast
    • LEAP Awards
    • Oscilloscope Product Finder
    • White Papers
    • Webinars
  • EE Learning Center
  • Women in Engineering