fish@ihu1g.UUCP (Bob Fishell) (06/11/84)
(oo)
I have a recipe for an electric horn that is at least as effective as a
freon horn and has the added advantages of being permanently installed
and not quickly exhausted.
Radio Hack sells "low current buzzers" in the 6-volt and 12-volt sizes.
Get TWO of the 6 volt ones. Connect them in parallel. Each of the
buzzers has a tuning screw in the back. Turn one of these to the right
so as to alter the pitch.
Connect these buzzers to TWO 9-volt batteries hooked up in series, so
as to provide an 18-volt supply to the buzzers via a pushbutton switch.
I mounted mine on the front reflector tongue; many other arrangements
are possible. Battery life is more than a year (with alkalines).
This horn is extremely loud, loud enough to cause pain in the ears if
you're a couple of feet away and right in front of the diaphragms.
It's guaranteed to make joggers jump, even when they're blasting their
Walkmans at maximum volume, and can be heard inside any car.
--
Bob Fishell
ihnp4!ihu1g!fishdsn@umcp-cs.UUCP (06/12/84)
Your idea about the horn is interesting--but if you're using an 18 volt
power supply, don't you want to hook the buzzers in series rather than in
parallel?
--
Dana S. Nau
CSNet: dsn@umcp-cs ARPA: dsn@maryland
UUCP: {seismo,allegra,brl-bmd}!umcp-cs!dsnlabelle@hplabsc.UUCP (WB6YZZ La Belle) (06/13/84)
No! hook the buzzers in parallel. Apply 18v to the 12v buzzers!
I bought some and tried it- makes plenty big noise. Now all I have to do
is figure out how best to mount them.
GEORGE