Go Back   Badcaps Forums > Troubleshooting Hardware & Devices and Electronics Theory > General Electronics Technical Discussion
Register FAQ Calendar Search Today's Posts Mark Forums Read

Thread Tools Display Modes
Prev Previous Post   Next Post Next
Old 01-10-2021, 07:05 AM   #1
barry wilkins
Senior Member
Join Date: Aug 2009
City & State: Maidstone Kent
Posts: 164
Default 4017 counter reset problem

I have been trying to make a counter for my vehicle alarm .I need to reduce the pulses that operate the hazard warning lights.
Because of the ECU you cannot connect directly to the lamps ,so I fitted a relay across the hazard switch. This works ,but because the number of pulses are odd this causes the lamps stay on ,and you have to switch them off by pushing the switch once.
I had a couple of ideas ,one was to use a couple of 74121 monostable ICs to give me 2 pulses.
The circuit I came up with is a Decade counter that uses counts 0 and 3 summing these together gives me the 2 pulses I need if I feed back count 4 or 5 as a reset
Occasionaly the second pulse returns to a high causing the relay to stay on, ,it seems like the reset might the the problem .
On the TI data sheet it does show a circuit using a 4001 to reset the IC.
Any thought on how I could solve this ?

Barry Wilkins
barry wilkins is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump Technical Forums 2003 - 2021
Powered by vBulletin ®
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 04:24 PM.
Did you find this forum helpful?