Re: Looking for a pulse switch? Does such a thing exist?

On Wed, 31 May 2006 05:36:27 -0700, dave_bonnell@xxxxxxxxxxx wrote:

Hi all,

I have a battery-based application powering a 12V light. I want to
pulse the light on and off automatically (similar to a strobe). The
duty cycle will probably be around 10%, but I'd accept just about
anything if the solution is simple enough.

I want to avoid use of PIC or other microcontrollers, as that would
likely require power regulators...recall, I'm using a 12V "dirty"
source. Not only that, but the intended use is in a somewhat harsh
environment (severe vibration, moisture) and I have very little space
(the 'switch' must be attached to the light itself).

So, does anyone know if there any ready made products (or simple
solutions) to pulse a light on/off?

Cheers,
Dave

I'm guessing that there's one ground on your light, and two leads which
are "low beam 1" and "low beam 2", where both "low"s to +12 is high
beam, right?

I'd do a 555 with your duty cycle, but upside-down, i.e., low for the
..1 second and high for 1.9. Put about a 4.7K pullup to +12V, and get
some P-channel power MOSFET; put its source to +12, its gate to the
output of the 555, and its drain to the section of the light that's
not always on.

Good Luck!
Rich


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