Circuit-Projects.com Logo
  Search
  Search through schematics
       
Become a reader:
 
 
Subscribe to Feed


Metering

Frequency Counter

Print E-mail

Frequency Counter Thumb

In this project we are building a basic and low cost frequency counter circuit . It can measure from 16Hz to 100Hz signals with a maximum amplitude of 15V. The sensitivity is high, the resolution is 0.01 Hz. The input signal can be a sine, a square or a triangle waveform.

The counter can be used in many applications. For instance, to observe an oscillator’s accuracy, to measure the mains frequency or to find out the rpm of a motor that is connected to an encoder.

The CCP (Capture/Compare/PWM) module of the PIC microcontroller counts the input signal. Only the capture function is used. To learn more about the CCP module of the PIC please visit www.microchip.com.

Before measuring the frequency of the input signal, the signal must be converted to the square waveform. So an optical isolator circuitry with 4N25 optocoupler is used for this purpose. So the input signal is safely isolated from the microcontroller circuit and converted to square wave. The signal amplitude must not exceed 15V. If this happens, 1k resistor may burn. If you want to measure the mains frequency, you should use a 220V/9V transformer first.

 

Frequency Meter for 10 Hz to 100 kHz Input by 74121

Print E-mail

Frequency Meter 10Hz to 100kHz Range Schematic

Description:

This frequency meter is suitable for sinusoidal wave and square wave input signals. Minimum input potential must be 25mV(rms). Measurement range can be determined from 10 Hz to 100 kHz by using the S1 switch. Each switch position part is calibrated by using 20 kOhm potentiometer. Total current consumption of the circuit is about 10mA. R1 and C1 values should be chosen depending on wheather microampermeter or milliampermeter is used.

 
<< Start < Prev 1 2 Next > End >>

Results 1 - 2 of 3


Submit Your Project
You can share your own electronic circuit schematics/diagrams or projects with people from all around the world...
Please Click
Resistor Value Calculator
4 Band | 5 Band
B1
B2
B3
B4
Value:
Tolerance:
Circuit Categories
Home
Audio
Control
Converter
Metering
Power Supply
Radio Frequency
Miscellaneous
..................................................
Submit Circuit
Circuit Diagrams
Microcontroller
Subscribe
Google Reader or Homepage
Add to My Yahoo!
Subscribe with Bloglines
Subscribe in NewsGator Online
Add to My AOL
Subscribe in Rojo
Add to Technorati Favorites!
Add to netvibes
New Circuits

Translate This Page

12V DC to 220V AC In...
1. pls i need a design for 2000w can u help me send it
Simple Cell Phone Ja...
2. hey this is a great circuit. I am using it as an extra project in my electronics class, bu...
12V DC to 220V AC In...
3. hi dear i needed aconvertor220vdc to 220ac tank
Long Range FM Transm...
4. cn anyone help me..m goin to make a long range FM transmitter.. if anyone hav any idea abo...

 

Electronic Circuit Projects
Circuit-Projects.com is licensed under a Creative Commons Attribution-No Derivative Works 3.0 License.

 
Powered by Joomla. The original Circuit-Projects.com theme is used.