talking clock extension

talking-clock extension elektor april 1983 The "Talking clock" presented by Elektor in the June 1982 issue only speaks when instructed to do so. In order to hear the time, it is therefore necessary to press the talk button. The following extension makes the circuit more convenient and the time is announced every hour. talking-clock extension E.A.J. Bogers Table 1. Minutes ones Digit Signal M.O. . abefg 0 11110 1 01000 2 11101 3 11001 4 01011 5 10011 6 10111 7 11000 8 11111 9 11011 The speech generator IC (IC1 in figure 4 of the Elektor June 1982 issue) receives its time information via flip/flops IC2 . . . IC5. This is the information for the minutes and minute tens, hours and hour tens. The information for the minutes and minute tens which are present at the control inputs of the speech generator IC are listed in tables 1 and 2. At every full hour (at XX.00) the minutes information M.O.f and M.O.g is "1-0" and at M.T.e and M.T.f it is "1-1". These logic signals only appear in thi...