PLL SINGLE TONE DECODER

  
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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 - schematic

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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