Electronics > Projects, Designs, and Technical Stuff
Airhorn for my (upcomming) Bike
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thm_w:
I would go with a scooter/car horn instead. Electric will last much longer, air is an option as well but doesn't last more than a few times.

https://www.aliexpress.com/item/USB-Rechargeable-Bicycle-Bell-Electric-Horn-MTB-Mountain-Road-Cycling-Warn-Rings-Bicycle-Accessories-High-Quality/32858778443.html (premade unit)
https://www.aliexpress.com/item/12V-135DB-Black-Car-Horn-13-x-10-x-9-cm-Snail-Waterproof-Horn-for-Almost/32872078541.html
https://www.amazon.ca/Delta-Cycle-AH1000-Airzound-Bike/dp/B000ACAMJC

You could power one from a high current 18650 (they draw really high pulse currents). Louder versions are available with a plastic snail horn, of course downside is larger size and weight. I've seen 6 and 12V option, two li-ion and the 6V version might be simpler to drive.
Planning on building my own at some point.
IDEngineer:
The simplest solution is usually the best:



Rated at 115dB (not sure what weighting curve they used, but 115dB is very loud regardless). Small, compact, easily transported and operated, zero additional infrastructure (read: no pumps nor power sources). Costs under USD 20.00. There are even smaller versions for under USD 10.00, shipped by Amazon to your door. Search for "marine emergency horn" and similar phrases, they are also sold at Walmart and virtually every sporting goods store. In my state it is a legal requirement to have one on every vessel so they're plentiful and cheap.

As a technical project I like it, but if your actual goal is a really loud horn this would be a great way to quickly gain experience.
coppercone2:
I swear the uses this guy comes up for electronics are ridiclous. Next thing you know its gonna be how to design a fan that fits on your cock so you can destroy NATO bathrooms.

How about you don't do something completely retarded. Putting a solenoid between one of those compressed air cans and a horn for optimum mounting, and maybe a gas delivery system so you can mount the tank in a place different then the horn would be a good project. Mounting ship and train electronics on a bicycle is not. Someone is gonna find your pattern and hit you with a stick around a corner or throw a brick at your head if you piss them off with ultra damaging loud noises.
tomato:

--- Quote from: coppercone2 on October 22, 2018, 10:22:11 pm ---Next thing you know its gonna be how to design a fan that fits on your cock so you can destroy NATO bathrooms.
--- End quote ---

You're going to have to explain that one.  On second thought ... no, don't.
coppercone2:
read the ham forum, he wanted a how to on trolling nato air defense with balloons filled with chaff .. his engineering ideas are just 'bad ideas'.
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