PLL SINGLE TONE DECODER


Posted on Feb 6, 2014

Can be used for Touch-Tone decoding as well as for telephone-line and wireless control applications using single audio frequency. Operating center frequency depends on H1 and C1. R1 should be between 2K and 20K. C1 in microfarads is computed from f = 1/R1C1, where R is in megohms and f is in hertz. C2 is low-pass filter in range of 1-22 F; the la


PLL SINGLE TONE DECODER
Click here to download the full size of the above Circuit.

rger its value, the narrower its bandwidth. C3 is not critical and can be about twice C2. -C. D. Rakes, "Integrated Circuit Projects, " Howard W. Sams, Indianapolis, IN, 1975, p 68-73.




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