Clock Tutorial N 1 Seconds and Minutes Counting

I have more space so i could use a 555 timer. So. The 555 timer will a high signal at 1hz rate. Then there are two red leds. They blink every second. i used them because i didnt use 7-Segment display on my full.clock. if you dont want them to blink just connect to the 4v unused output and replace 50 ohm resistor for a 35 or 40 ohm Logical Operators UNIT SECS: 1-AND Gate to pins B D. This gate gives true while both pins has a High signal. It ll give a High signal to reset on the unit secs counter. (Will reset when counter value reaches hex A). TEN SECS 1-AND Gate to pins B connected to ten secs counter and up on next counter. (Will reset when reaches 6). MINUTES I included the unit min counter without decoder and display. Minutes construction is the same as seconds. Since it has the same conditions. Clock 24hs Full Assemble http://everycircuit.com/circuit/5422850782527488 Clock Tutorial N 2 Hours Counting http://everycircuit.com/circuit/6171646638424064

published 9 years ago