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 Forum index » DIY Hardware and Software
cd4040 q1 not working
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ello



Joined: Aug 20, 2018
Posts: 10
Location: germany

PostPosted: Sat Sep 08, 2018 5:06 am    Post subject: cd4040 q1 not working Reply with quote  Mark this post and the followings unread

hello, i am facing a strange issue. i have a cd4040 with a stable clock and a led to test the outputs. every output besides q1 makes the led blink according to the division. but q1 only creates a weak glow. this is happening for different 4040 chips, so i cannot believe they are all broken.

any ideas what can cause this?

cheers,
ello
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PHOBoS



Joined: Jan 14, 2010
Posts: 4451
Location: Moon Base
Audio files: 625

PostPosted: Sat Sep 08, 2018 8:06 am    Post subject: Reply with quote  Mark this post and the followings unread

Do you have the reset input (pin 11) connected to ground ?
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ello



Joined: Aug 20, 2018
Posts: 10
Location: germany

PostPosted: Sat Sep 08, 2018 11:56 am    Post subject: Reply with quote  Mark this post and the followings unread

yes, thank you. i soldered it and it seems my breadboard is crap. dunno, i have tested it on three different boards and all are faulty.
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kaputtpanzer



Joined: Nov 02, 2009
Posts: 108
Location: Cologne
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PostPosted: Fri Sep 28, 2018 8:00 am    Post subject: Reply with quote  Mark this post and the followings unread

I had the same issue with a 74 HCT 4040. Q2, Q3, Q4 and so on were working but Q1 not. I think the HCT ic is the problem, it does not even have buffered outputs Evil or Very Mad I will buy some CD 4040 and try it again. Did you use HCT or CD ics?
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ello



Joined: Aug 20, 2018
Posts: 10
Location: germany

PostPosted: Fri Sep 28, 2018 8:37 am    Post subject: Reply with quote  Mark this post and the followings unread

i am using the cd4040be. and was definately the breadboard. i guess the pins are not 100% isolated to each other.
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