Count-down Timer Circuit Explanation
Under Category : TimerDevice selection by 3-8 decoder At this circuit, the selection of seven devices are done using the decoder(74HC138). Device number Device 0 BCD-SW for 10th of the minute 1 BCD-SW for 1st of the minute 2 Start switch 3 Unused 4 7 segment LED for 10th of minute 5 7 segment LED for 1st of [...]
