Frequency detection using LM567

Here I am used lm567 to detect desired frequency. It supports frequency between 0.01Hz and 500KHz .

Maximum ratings

• Supply voltage of 9V
• Output Current of 100 mA

Design example

Here R₁=10k, C₁=0.01uF
Then f_o=9090Hz
FREE RUNNING FREQUENCY =10.5KHz
But I got lock frequency = 11KHz

The measured lock frequency of 11 kHz is about 21% above the calculated 9090 Hz. You can check the deviation for your own parts with the percent change calculator.

INPUT AT PIN 3 (BLUE) & OUTPUT AT PIN 8 (YELLOW)

OUTPUT SIGNAL WHEN THE FREQUENCY OF DESIGN RANGE NOT PRESENT (PIN 8 -YELLOW)

FREE RUNNING FREQUENCY OF VCO AT PIN5

OUTPUT AT PIN 6 (CAPACITOR CHARGING AND DISCHARGING -BLUE COLOUR)

OUTPUT AT PIN 1( BLUE COLOR)

OUTPUT AT PIN 2( BLUE COLOR)

OUTPUT AT PIN 3( BLUE COLOR)

EXAMPLE – IR TRANSMITTER(555) AND RECEIVER (LM567 )

Applications

• v IR sensors
• v Ultra sonic sensors
• v Frequency detector

For ultrasonic designs, the wavelength calculator turns the detection frequency and the speed of sound into a wavelength, which is useful when spacing transducers.