Garmin GPSMAP Model 182C Yellow Wire on the Data Connector

[HPLou]

I have a Garmin 182C on my boat and the Alarms (Ancor, Depth,) Sound is very Low and hard to hear.
I have rad that the Garmin Marine Power and Data Cable 7 Pin Model: 010-10083-00 as a Yel Wire
to use for alarms.
My question is that I want to add an external speaker that I can use for my VHF Radio and also connect this
Yellow Wire so that I can hear the GPS Alarms throught the Ext Speaker.
Is it possible to do ?
Thank You
Louis

 

[joeanna]

this one is from an older model, it may be similar to yours, but I would check on your model's manual. Also, you would need to have some way of protecting the back feeding of your radio/gps from any surges that may "surge dump", another relay maybe (flip-flop circuit)....I would just use another speaker/buzzer to be safe.

http://www.manualslib.com/manual/56037/Garmin-128.html?page=63#manual

 

[mjf55]

Joeanna is right on. Search for your users manual. In your 182c version, it shows the circuit you need to make. You will need a relay with a 100ma max current coil in the relay. It said you should drive a horn, did not mention a speaker. I am not sure a speaker would work.

 

[HPLou]

Thank you for the details Joeanna & mjf55.
Yes, I will be using a horn instead of a speaker.
''You will need a relay with a 100ma max current coil in the relay''
This is chinese for me!!
What does it look like ?
Do I have to make it myself ?

 

[mjf55]

Its not something your should / can make. You need to search electeonics shops for a spst 12v normally open (NO) relay. Then read the spec to either look for coil current ( max 100) or coil resistance of greater than 120 ohm. I would think 240 ohm would be good.
Another alternative is a piezoelectric buzzer, with a current draw of less than 100 ma and attach it directly to the yellow wire.

What ever you find, make sure you can put wires on it.

Lesson if the day ;-)
100ma = 1/10 of an amp
Ohms law says current = volts / resistance.
So for the relay, you know max current (.1 amp ) and voltage (12). So the resistance of the coil is .1=12/R; so r=12/.1 which is 120 ohms. And a 240 ohm coil resistance is 50 ma current.

 

[sam am I]

Oooops, double posted w mjf55! Oh well, I'll leave this \/\/\/ info below for reference, what he had above ^^^ covered ya.

You'll need a 12VDC relay who's coil resistance is equal to or greater than 12V/.1mA = 120 Ohms (or **greater). This spec is lowest resistance value that yields the highest current sourcing limit that the Garmin's can provide through/on it's yellow wire.

The other consideration will be the relay's contact current rating..........

For example, if your 12VDC horn uses 5 Amps when it sounds, when you purchase the above spec's 12VDC 120 Ohm (.1mA) relay, it has to at least have a 5 Amp contact rating (7.5-10 Amp would be best practice)

**It appears that Radio Shack has removed their more technical spec sheets from their parts (go figure), but here's a Digi-Key example w the pertinent spec's listed that is probably close, if not the same to this RS type.**

BTW, these are not ignition safe/weather proof..........So best to mount this type in dry open air/in cabin else you'll have to spec out something more appropriate depending on your needs.........GL

 

[HPLou]

mjf55
this is the small Diesel 4'' Speaker ( link below) that I use for my VHF Radio.
And wanted to connect it to my Garmin 182C Yellow Wire.
Here's the link with some specs;

https://www.bobscb.com/shop/product...i-Plug-Black-12-Watt-Communications-Speakers/

Do you think it would be OK based on your calculation ?

 

[sam am I]

That yellow wire is NOT for a external speaker..........It is a on or off circuit to active a alarm or a relay/horn.

 

[HPLou]

sam am I
thank you for the relay links.
I will go to a local electronics supplier this week with the printed specs that is included in the Digi-Key Link.
At least I know what I am looking for now.
When purchased, I will get back with some other questions, If you guys don't care.
I will also look if they have a ''piezoelectric buzzer'' .
Maybe it would be a less headache for me.
Thanks again

 

[sam am I]

It should run this w/o a relay. It's 150mA, just a tad over the 100mA. Might run little less than 108db is all.

 

[joeanna]

and piezo speakers us much less "amps" to operate then speakers, most usually have the switching circuits built into them, like the one "sam am I" posted. they can also be quite loud, a smoke detector uses a piezo speaker.

 

[HPLou]

Super
Thank's sam am I & joeanna for the RS Piezo Buzzer Link. I will today stop at a local electronics store and buy the right buzzer.
I'l be back with results how it turned out.