Increasing frequency pulse generator (for motorcycle brake light)

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Thread Starter


Joined Jan 5, 2015

I have several motorcycles and want the rear brake light to pulse a few times before remaining on. I have built a circuit to do this using a quad nand gate.

However, at the moment the pulses are of equal duration. I can set the duration and pulse length and at the moment I have five flashes before the brake light remains on (while I am depressing the brake lever).

I would prefer to have variable pulse widths whose frequency starts slowly and then steadily increases before the light remains on. i.e. flaaaaaash, flaaaash, flaash, flash, on ......

Any help is much appreciated.


Joined Mar 24, 2008
The owners of All About Circuits has elected not to host discussions of automotive electrical system modifications/enhancements due to safety concerns, the potential of legal ramifications and the possible circumvention of vehicle regulations at the state and federal level.

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