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sequential problems need help quick

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Unmesh Sawant

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i have made a sequential with 555 and 4017 and it has worked perfectly but i have problems with output
the leds just pulse only but i want the led to be on till the circuit is complete i.e till last led and again the cycle will go on
i want it to be like this



plz sugest something so my project is complete


Thanks in advance
Unmesh
 

hi,
A 4017 will only power one LED at a time. its a Johnson counter to 10 decoder.

Replace the 4017 with 8 bit Serial In, Parallel Out Shift register IC, these can be cascaded to give 16 outputs or more.

Eric
 

Unmesh Sawant said:
i have made a sequential with 555 and 4017 and it has worked perfectly but i have problems with output
the leds just pulse only but i want the led to be on till the circuit is complete i.e till last led and again the cycle will go on
Unmesh
Click to expand...

You can either do it by adding SCR to the outputs of the 4017 like here...

https://scdiagramwiring.blogspot.com/2013/03/sequential-led-bar-graph-circuit-using.html

OR

Use a 74LS164 shift register like post #34 on this link...

https://forum.allaboutcircuits.com/showthread.php?t=85466&page=4

Allen
 

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