Figure 7.11 Block diagram of MC1310. On the left is a terminal labeled input. It connects to a block labeled input buffer. The output of the buffer goes to one of the inputs of a phase detector. The output goes to the control input of a 76 kHz voltage controlled oscillator, V C O. The signal output of the V C O goes to the clock input of a J K flip flop. The output of the flip flop is at a frequency of 38 kHz. The Q output of the flip flop goes to another J K flip flop. Its output frequency is 19 kHz. The 19 kHz signal goes to the other input of the phase detector. The signal from the buffer also goes to the inputs of two D B Ms, double balanced mixers. See text. The other input of one of the D B Ms is 38 kHz that comes from the Q output of the first flip flop after the V C O. The Other input of the other D B M comes from the not Q output of the same flip flop. The two D B Ms are receiving 38 kHz carrier signals that are 180 degrees out of phase. The output of the D B M that is receiving carrier from the not Q output is connected to one end of a 75 k ohm resistor. The other end of this resistor goes to the R output. There is another 75 k ohm resistor connected between the buffer output and the R output. There is a 0.001 u f capacitor connected from the R output to ground. The output of the D B M that is receiving carrier from the Q output is connected to one end of a 75 k ohm resistor. The other end of this resistor goes to the L output. There is another 75 k ohm resistor connected between the buffer output and the L output. There is a 0.001 u f capacitor connected from the L output to ground. End verbal description.
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