convert servo signal into on/off

[shaunjohnson]

i'm stuck for info and you guys are very smart when it comes to electrics so...
i want a horn...very useful when nitro-orientated marshals didn't see you shoot off the berm and go bush, costing you the race.

so i dug out my old servo control board that i converted into a simple ESC when i was 10y.o. it still worked, and since it was an ESC it drove the horn pretty well.
trouble is i was looking at it the other day and found it to be generating quite a bit of heat, i was worried at first that it may have killed the MMM's BEC but it seems to be ok so i removed it.

so down to buisness, can i convert the PWM of a servo signal (1-2ms ish range or whatever it is) into a simple on/off signal to turn on and off (and power if possible) my horn circuit?for either a simple buzzer to a small 555 timer circuit to make a louder horn.

any ideas fella's?
shaun

[junkman]

how about something like this http://www.hobbycity.com/hobbycity/s...idProduct=8833 I have a couple I was going to use for lights on a scaler, but just have never gotten around to it, so I can't comment on how it works. I like the horn idea

[shaunjohnson]

thanks mate..now just have to rig up a 555 timer to drive the horn itself

[suicideneil]

Funny, I want a horn on my truck, but not for the same reason- ideal for scaring small dogs and warning stupid children/ tourists that their legs are about to be ripped off by a 13lb truck travelling at 40mph+...

[brushlessboy16]

YOu need a PWM switch.
http://www.robotmarketplace.com/products/0-DGSW5.html

[suicideneil]

Dimension engineering sell various suitable items too- along with some quite powerful relay type switches controlled by the radio:

http://www.dimensionengineering.com/productpage.htm