add
add
Menu

High precision frequency and voice detector


Here is a very interesting and useful project high precision frequency and voice detector made from IC LM567 and can be used for detecting frequency with high precision and it also detects voice.

Circuit description of high precision frequency and voice detector 

The main part or heart of the circuit high precision frequency and voice detector is IC LM567 which comprising a phase locked loop (PLL), and detect frequency range between 0.01 Hz to 500 kHz. The value of detection of frequency and voice detector can be changed by changing the value of low-pass-capacitor. The formula for calculating the value of low pass capacitor is

L.C = n/Fr

Where Fr = 1.1/(R2 * C2), while n= 1300 for two percentage detection bandwidth and 6300 for 14 percentage. 1.1 kHz PLL running frequency is set by R2 and C2.

PARTS LIST

Resistors (all ¼-watt, ± 5% Carbon)

R1 = 22 KΩ

R2, = 10 KΩ

R3 = 1 KΩ

Capacitors

C­1, C2 = 0.1 µF

C3 = 1 µF/16V

C4 = 2.2 µF/16V

Semiconductors

IC1 = LM567

D1 = LED

D2 = 1N914

Miscellaneous

6V relay

 

 

Related Project

  1. Signal Booster Short Wave Radio convert the old valve radio into a power pack receiver
  2. Audio Amplifier For Portable Radio Receiver alternative of the complicated audio amplifier circuit for portable radio receiver
  3. 70/40 Watts Hi-Fi Amplifierworld best Hi-Fi amplifier you may never have to replace by a better one
  4. Simple FM Transmitter Transmit noise free F.M. signal in the wide range up to 100 M using only one transistor
  5. Triangular Wave Generator generate triangular wave with maximum peak level (VMAX) and minimum peak level (VMIN)

 

 

 

Leave a Reply

Your email address will not be published. Required fields are marked *