Decade counter ckt - Electronic Circuits Projects Diagrams Free

madmikejt12 · 24th September 2006, 05:41 PM

Hi, i have made a simple astable 555 timer circuit connected to the clock input of a 4017 decade counter.

I am getting a pulse from the 555 timer (i have an LED connected direct to pin 3) but output 0 stays on on the counter (where i have 6 LED's)

the 4017 has power (+/-), a reset (pin 5 to pin 15 so it resets when it gets to output 6)

The problem is, only the 1st LED lights (output 0) it does not flash either, just stays on

Any ideas?
Mike

BigE4u · 24th September 2006, 05:51 PM

What resistor and capacitor values are you using for you astable 555 circuit?

EDIT: If you want better control over the output on pin3 for testing purposes with your test led, read over this and may i suggest for now using a 10k pot for R1, 1k for R2 and a 10uf capacitor for C1... http://ourworld.compuserve.com/homep...t/elect128.htm

eblc1388 · 24th September 2006, 06:50 PM

Quote:

Originally Posted by madmikejt12

the 4017 has power (+/-), a reset (pin 5 to pin 15 so it resets when it gets to output 6)

You need to pull down the clock enable(pin13) to 0V directly or via a resistor for the 4017 to count.

madmikejt12 · 24th September 2006, 10:00 PM

hi, thanks for your ideas, it was a lose connection somewhere
sorted it now

sorry,

Mike

kmahbub · 2nd February 2007, 11:48 AM

good , thanks u

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Title	Starter	Forum	Replies	Latest
Decade Counter	ghauri	Electronic Projects Design/Ideas/Reviews	1	11th June 2006 11:59 PM
7490 decade counter	lexie	Electronic Projects Design/Ideas/Reviews	3	23rd March 2006 12:52 AM
IC decade counter Q..	BTDe	Electronic Projects Design/Ideas/Reviews	1	19th March 2006 07:35 PM
74190 up/down decade counter help	RAA	Electronic Projects Design/Ideas/Reviews	21	1st December 2004 11:31 PM
Can't get decade counter to work	Axe_Murderer	General Electronics Chat	9	17th November 2003 05:42 PM

24th September 2006, 05:41 PM	(permalink)
madmikejt12	Decade counter ckt Hi, i have made a simple astable 555 timer circuit connected to the clock input of a 4017 decade counter. I am getting a pulse from the 555 timer (i have an LED connected direct to pin 3) but output 0 stays on on the counter (where i have 6 LED's) the 4017 has power (+/-), a reset (pin 5 to pin 15 so it resets when it gets to output 6) The problem is, only the 1st LED lights (output 0) it does not flash either, just stays on Any ideas? Mike

24th September 2006, 05:51 PM	(permalink)
BigE4u	What resistor and capacitor values are you using for you astable 555 circuit? EDIT: If you want better control over the output on pin3 for testing purposes with your test led, read over this and may i suggest for now using a 10k pot for R1, 1k for R2 and a 10uf capacitor for C1... http://ourworld.compuserve.com/homep...t/elect128.htm __________________ Electronic Display Buff... Last edited by BigE4u; 24th September 2006 at 07:31 PM.

24th September 2006, 10:00 PM	(permalink)
madmikejt12	hi, thanks for your ideas, it was a lose connection somewhere sorted it now sorry, Mike

2nd February 2007, 11:48 AM	(permalink)
kmahbub	good , thanks u