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TONE_OUTPUT_FOR_DIGITAL_DISPLAY

2016-12-04 12:44  
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TONE_OUTPUT_FOR_DIGITAL_DISPLAY
TONE_OUTPUT_FOR_DIGITAL_DISPLAY
TONE_OUTPUT_FOR_DIGITAL_DISPLAY
TONE_OUTPUT_FOR_DIGITAL_DISPLAY
TONE_OUTPUT_FOR_DIGITAL_DISPLAY
TONE_OUTPUT_FOR_DIGITAL_DISPLAY
Converts BCD input from digital test gear to sequence of 10 different tones representing 0 to 9, for recognition of reading on digital display by blind radio operator or experimenter. Length of tone sequence equals number of digits displayed, plus sign indicator or half-digit if desired. Circuit shown is for 31/2 digits. Article describes operation of drcuit and gives construction details. Resistors R0-R9 (values inkilohms from 6.8K to 470K),determining frequencies of generated tones,are switched into VCO IC10 by IC9-D,R Pacholok,Digital to Audio Decoder,73 Magazine,Oct 1977,p 178-180.