Re:Sequential LED turn signal 2008

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Thread Starter


Joined Sep 30, 2011
I am trying to make turn signals for my bike and searching brought me to this old thread;

I am just one more of the circuit board newbies that wants to attempt this project even though I know it is way over my head. I have all the parts and I have started to bread board it and I think I am getting close but I have a few questions about the 4071. First regarding the Vss and Vdd, I have gotten so far as to figure out it is the ground and power supply but is there any need to regulate that voltage? From what I am reading all of these components have very broad voltage ranges and I am just not familiar with components that will work from 3-18 volts or whatever it is. Also, can one 4071 be used for this board or do I need to use a separate 4071 for each LED? Thanks for any help.


Joined Jul 17, 2007
Hello Wurlybird,

Our Terms of Service has changed early this year, and these types of projects are no longer supported according to the revised ToS:

6. Restricted topics. The following topics are regularly raised however are considered "off-topic" at all times and will result in Your thread being closed without question:
  • Any kind of over-unity devices and systems
  • Automotive modifications
  • Devices designed to electrocute or shock another person
  • LEDs to mains
  • Phone jammers
  • Rail guns and high-energy projectile devices
  • Transformer-less power supplies
After much discussion, we have realized that we are not automotive engineers, and people who we were trying to advise on such projects usually had very little experience and no training.

This could easily lead to very unsafe conditions for the person attempting the project(s). Since our overriding concern on this Forum is the safety of our hobbyists, along with concerns with legal matters, it was decided on the highest management level that such discussions would no longer be entertained.

I strongly suggest that you abandon your idea of modifying your safety lights; as they will not be as reliable as the original equipment, and the modification may not be legal.

If you feel that you absolutely must attempt it, you will need to seek support for your project elsewhere.
We have compiled a short list of boards where your project might receive support:

However, as I have already suggested, your modification idea is strongly discouraged from safety/legality/reliability reasons.

Furthermore, I will add that NO circuits presented on this forum are suitable for use in an automotive environment.
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