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Email Statistics | September 29, 2016
Schematics Depot >> Audio >> sound detector tone decoder

sound detector tone decoder:


parts:
U1NE567 IC
R150k ohm 3 to 15-turn precision potentiometer
R21k ohm resistor
C10.022uF monolithic of Hi-Q ceramic capacitor
C20.02uF ceramic capacitor
C30.005uF ceramic capacitor
C41uF ceramic capacitor

all resistors are 5 or 10 percent tolerance, 1/4-watt
all capacitors are 10 percent tolerance,
rated 35 volts or higher
this is also designed to be in conjunction with the sound detector amp/electret mike amp. this circuit is designed to trigger on a 1 khz tone. to change this frequency - refer to the table below, then change the resistor and capacitor values accordingly.. if you want the equation for finding the center freq. posted, email webmaster@reconnsworld.com
Center frequency of LM567
R1 C1=0.0047 C1=0.01 C1=0.022
470ohm 411.54 193.42 87.92
1k 193.42 90.91 41.32
1.5k 128.95 60.61 27.55
2.2k 87.92 41.32 18.78
3.3k 58.61 27.55 12.52
4.7k 41.15 19.34 8.80
5.6k 34.54 16.23 7.38
10k 19.34 9.09 4.13
22k 8.79 4.13 1.88
33k 5.86 2.75 1.25
47k 4.12 1.93 879 Hz
100k 1.93 910 Hz 413 Hz
220k 880 Hz 413 Hz 188 Hz
All frequencies in kHz unless otherwise noted;
capacitance in uF


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