Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

LED Sequencer With 4017

Status
Not open for further replies.
I

iamkamalrandhawa

Advanced Member level 4
Full Member level 1
Joined
Nov 30, 2011
Messages
110
Helped
26
Reputation
52
Reaction score
21
Trophy points
1,298
Location
india
Visit site
Activity points
1,784
I want to make an LED up/down Sequencer Using 4017+555Timer Ic. But i also need Previos LED'S active at same time.







Thank You.
 

4017-2.gif


05280.png
 

But i also need Previos LED'S active at same time.
Click to expand...

Does this mean you want to add a bit of extended 'On' time to each led?

Something like ten of one or the other schematic below could work.

The one on the left uses no transistors but draws substantial juice from the 4017. A large capacitor is supplemented by a bit of current from the supply.

The one on the right uses a transistor and a smaller capacitor. It draws slight juice from the 4017. The transistor can be replaced by an equivalent device (digital gate, etc.)

These are ballpark values based on 10 percent duty cycle, each cycle taking 1/2 second.

17_1338069598.gif
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top