Heya, I've got a channel available on my trail rig and nothing to plug into it, so I was wondering if anyone's ever seen a small beeper/horn for RC cars that will work off this spare channel. I'm looking to keep it really small and light, so something like a gigantic Tamiya sound unit is out of the question. I was thinking of something more like the size of a power capacitor.

Thanks.

Jim

You might have to do some research to find something pre built and fairly small. If you want it loud enough to be heard from a distance, it will need a speaker with an amplifier. Im sure theres some company that makes one though... just don't know if it will fit your size specifications.

I don't know. You can get those screechingly loud low voltage alarms and they're pretty small. I'm thinking buy a loud 6v piezo buzzer and hook it up to the logic board from an old micro servo or even a little winch driver circuit.

Crap, I'm soldering again.

search google for "Hopkins 1156 Backup Alert" or go to your local truck parts store. we sell them at my store for <$20

its a bulb/beeper combo thats the size of a regular 1156 reverse/turn signal bulb, and its easy to remove the bulb if you so desire.

edit: found this clip on youtube. mind you, its in a heavily insulated 5 series BMW tail light/trunk, in the open air they are much louder.

+ YouTube Video

After a recent race with inattentive marshals I was thinking about the same thing. Is it legal under race rules to have a beeper in your car? I was warned for yelling from the drivers stand (as my car sat 2 feet behind a marshal that was watching the racing action on the other side of the track ).