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12-14-2020, 09:04 AM | #1 |
Member
Join Date: Mar 2017
Location: Venice, Fl and Marcy, NY
Posts: 93
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AAOOGAH horn regulator
I only know enough electronics to be dangerous so I'm wondering if we have any electrical technicians who might be able to help with something I've been wondering about.
My horn works perfectly with the engine off or at idle giving off the desired 3 step response; AHH OOOG AHH. But at road speed with the amperage (and voltage) up it runs too fast and only goes OOG AHH. I'm wondering if a diode or something could be added to the horn wire that would limit the voltage to 6 volts. I've heard of a Zenner diode and an avalanche diode, but don't know enough about that stuff to figure out what might work |
12-14-2020, 09:45 AM | #2 |
Senior Member
Join Date: Dec 2017
Location: Guthrie, OK
Posts: 1,141
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Re: AAOOGAH horn regulator
I think this is fairly normal behavior. You can try adjusting third brush voltage downward if you drive mostly at speed. Otherwise you need voltage regulation from the generator. A zener wouldn't handle the current required.
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12-14-2020, 09:46 AM | #3 |
Senior Member
Join Date: Jun 2020
Location: Hartford area, CT
Posts: 374
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Re: AAOOGAH horn regulator
A diode's main job is to operate as a one-way street. Current only flows in one direction through the diode.
What you want to do is regulate voltage. Are you on a generator? It's going to be more complicated to do if you are. |
12-14-2020, 11:12 AM | #4 |
Senior Member
Join Date: Jan 2012
Location: Western North Carolina
Posts: 3,820
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Re: AAOOGAH horn regulator
Try adjusting it first. If that does not work you can add a resistor to drop the voltage. A diode will have a voltage drop too. The trick is to get a diode or resistor that will take the current. The voltage drop plus current equals heat.
The parts suppliers sell resistors that are meant to drop 12 volts to 6 volts that may work with your 6 volt system. Some are designed to be mounted to the frame and will take continued use of the horn while others mount inside the horn and are for intermittent use. Both are mostly plug and play so you should have no problems installing them. I have the latter and it works fine as I don't lay on the horn for more than a few seconds. I don't know what the current is but I would guess at around 6 amps.
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A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
12-14-2020, 11:17 AM | #5 |
Senior Member
Join Date: Jan 2012
Location: Western North Carolina
Posts: 3,820
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Re: AAOOGAH horn regulator
You can also build or possibly buy a voltage regulator. Do a google search for a voltage regulator or voltage regulator circuit.
__________________
A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
12-14-2020, 11:32 AM | #6 |
Senior Member
Join Date: Jul 2010
Location: Pennsylvania
Posts: 1,096
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Re: AAOOGAH horn regulator
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12-14-2020, 11:36 AM | #7 |
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Join Date: May 2010
Location: Pine, AZ
Posts: 792
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Re: AAOOGAH horn regulator
First, are you running 6V or 12V? Adjusting the horn would be the first step if running a stock 6V system. The dropping resistor could be added if running a 12V system.
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12-15-2020, 08:46 AM | #8 | |
Senior Member
Join Date: Dec 2017
Location: Guthrie, OK
Posts: 1,141
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Re: AAOOGAH horn regulator
Quote:
And yes, the horn requires about 6A. |
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12-15-2020, 03:15 PM | #9 |
Senior Member
Join Date: May 2010
Location: Oregon
Posts: 5,947
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Re: AAOOGAH horn regulator
Add 1 or 2 clicks to the adjusting screw and go for a ride.
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