Hello Friends..
i m currently desigining a stereo encoder circuit so that i can convert my useless 1W mono xmitter to a complete stereo one..
i have made the design using the DSBSC theory.. I m tryin it out on a bread board.. i m working on it since last 3 WEEKS..!!! But my fate is too rude on me..!! The entire stuff looks useless as it gives NO SIGN OF STEREO SEPERATION.. might be bats maybe hearin it.. but not me..!!
okay.. let me explain what's my circuit :
using LF351 i generated L+R and L-R signals..
i used a 555 oscillator to generate accurate 76Khz signal with the help of my multimeter... by feeding it to a 4013C i got a 38KHz square wave signal and a 19Khz Square signal...
using a active 20Khz lowpass filter i converted 19khz square signal to a sinusoidal one.. Everywhere i used LF351 op-amp..
then i feed the 38khz signal to C4066 chopper to modulated L-R signal.. Then the output of 4066 is connected to a 38khz active bandpass filter to generate DSBSC signal.. (I DOUBT IS THIS THE WAY DSBSC CAN BE GENERATED ???????)
by mixing 19khz pilot, DSBSC and L+R to a op-amp Adder i fed it to my mono transmitter and played a song which didnt seperate in my stereo FM...
SO AFTER THIS STORY i wanna know; is my design alright..?? I even used isolation buffer after L+R and L-R , to prevent impedance changes at the input affect the output..
When i start the transmitter, the FM Stereo LIGHT of my receiver glows... but no sepration occurs..?? only a background stereophoic sense distortion is bein felt after i start the pilot..
I feel that my 38 Khz subcarrier has some critical error.. SO PLS GUIDE SO AS TO WHAT CHANGES MAY I TRY OUT..!!
Waitin for an earliest response..
i m currently desigining a stereo encoder circuit so that i can convert my useless 1W mono xmitter to a complete stereo one..
i have made the design using the DSBSC theory.. I m tryin it out on a bread board.. i m working on it since last 3 WEEKS..!!! But my fate is too rude on me..!! The entire stuff looks useless as it gives NO SIGN OF STEREO SEPERATION.. might be bats maybe hearin it.. but not me..!!
okay.. let me explain what's my circuit :
using LF351 i generated L+R and L-R signals..
i used a 555 oscillator to generate accurate 76Khz signal with the help of my multimeter... by feeding it to a 4013C i got a 38KHz square wave signal and a 19Khz Square signal...
using a active 20Khz lowpass filter i converted 19khz square signal to a sinusoidal one.. Everywhere i used LF351 op-amp..
then i feed the 38khz signal to C4066 chopper to modulated L-R signal.. Then the output of 4066 is connected to a 38khz active bandpass filter to generate DSBSC signal.. (I DOUBT IS THIS THE WAY DSBSC CAN BE GENERATED ???????)
by mixing 19khz pilot, DSBSC and L+R to a op-amp Adder i fed it to my mono transmitter and played a song which didnt seperate in my stereo FM...
SO AFTER THIS STORY i wanna know; is my design alright..?? I even used isolation buffer after L+R and L-R , to prevent impedance changes at the input affect the output..
When i start the transmitter, the FM Stereo LIGHT of my receiver glows... but no sepration occurs..?? only a background stereophoic sense distortion is bein felt after i start the pilot..
I feel that my 38 Khz subcarrier has some critical error.. SO PLS GUIDE SO AS TO WHAT CHANGES MAY I TRY OUT..!!
Waitin for an earliest response..