This is another Running LED circuit from Radio Electronics. The circuit is very simple consists of three main components, Timer 555, 7493 Binary Counter, 4 line to 16 line decoder 74 154.
How do this Running LED circuit work : 555 timer generates a rapid circuit pulses when the switch S1 is open. Pulses are counted in groups of 16 and converted into a binary code by 7493 which is then given to 74154 (decoder 1 to 16). It is combined so the output will be low in order to change the sequence with the 7493 count. If the switch is closed, only one LED will light. Current-limiting resistor R3 is used for all LEDs, because only one LED will light up, in a moment.
Part list :
How do this Running LED circuit work : 555 timer generates a rapid circuit pulses when the switch S1 is open. Pulses are counted in groups of 16 and converted into a binary code by 7493 which is then given to 74154 (decoder 1 to 16). It is combined so the output will be low in order to change the sequence with the 7493 count. If the switch is closed, only one LED will light. Current-limiting resistor R3 is used for all LEDs, because only one LED will light up, in a moment.
Part list :
This Running LED circuit will need 5 Volt power supply.
Tidak ada komentar:
Posting Komentar