| Author |
Message |
bill chisholm (Billybandman)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, March 14, 2005 - 11:37 am: | |
I just bought a marine radio that has an input for "9.8 Volts maximum". For all of you electronic wizzes; how can I turn the 12 volt in my bus to 9.8 volts. Can't use 110 with a transformer cause I want to use it in my boat too.
Very, very low amperage. Less than .5amp on listen mode. |
Stan
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, March 14, 2005 - 11:48 am: | |
If max current is .5 amps then just use a 7809 package regulator. It is a three lead device in a TO-220 case and needs to be mounted on a heatsink. A 7809 costs under $2.00 and is pretty foolproof. If you need higher current then you need a more elaborate power supply. |
niles steckbauer (Niles500)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, March 14, 2005 - 12:45 pm: | |
Is that .5 amp input or outut - you need to know max input - Niles |
CoryDaneRTS
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, March 14, 2005 - 1:15 pm: | |
("
Very, very low amperage. Less than .5amp on listen mode. ")
BAD NEWS!
You have .5 amp in listen mode but transmit changes the formula.
GOOD NEWS!
That is the rating the receiver needs. Electronics use what they need as long as you supply the correct voltage.
FIX
There is a common converter that ( I hate to mention them) Radio Shack sells. (Other electronic places have them too)
Don't fool around with your electronis unless you know what you are doing. You might burn them up.
The device has a cigarette plug on one end and a 9v plug on the other.
How simple is that.
cd |
Vin (Billybonz)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, March 14, 2005 - 2:16 pm: | |
CD, great advice on the cigarette lighter PS. That way you could use the radio anywhere there is a car lighter.
You can never go wrong producing more amps than you need. Just because you have a 9v 1 amp power source doesn't mean it's going to stuff 1 amp through the radio. It will use what it will use. If you buy an adpater that has a higher amp capacity, you can use it to power other devices that may require higher amperage.
There are voltage adjustable ciggy lighter plugs that can adjust to your needed voltage. Just beware, there is nothing stopping you from pumping 9 volts into a device requiring 3 volts by accident. The same goes for polarity. You can change the tip from positive to negitive, but again, get it wrong and you may have a problem. The above is nice for flexibility, as long as one uses caution when setting it up.
This is the type of unit I'm refering to:
http://www.powerstream.com/dc-3318.htm just for an example, not an endorsement.
Bones |
bill chisholm (Billybandman)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, March 14, 2005 - 7:45 pm: | |
That cig light converter is exactly what I was looking for. Thanks. |
Ed Jewett (Kristinsgrandpa)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, March 14, 2005 - 9:51 pm: | |
If you decide to use the cigarette lighter converter, make sure you check the output voltage with an accurate voltmeter. The ones I checked put out a lot more than the setting on the switch indicated. It might not matter because as the load is placed on the converter the voltage drops some. Check it first.
HTH Ed |
CoryDaneRTS
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, March 15, 2005 - 6:52 am: | |
Exactly correct.
If you are concerned with the voltage on the power supply, see if you can check the voltage before you attache the receiver, and after.
Some of the cheapie PS need the load to pull the voltage down to the secified value. This is all in the design of the unit.
Since these power supplies are made for these electronics anyway, I don't think there is much to worry about since they were made to supply voltage to cd player, the old cassette players (sheesh, I was a kid when cassette players hit the scene, now they are obsolete) and cbs and who knows what else.
Good luck
cd |
FAST FRED
Rating: N/A
Votes: 0 (Vote!) | | Posted on Wednesday, March 16, 2005 - 5:44 am: | |
C Crane advertises a stable plug in unit for $15. or so.
Call and the tech guys will answer your questions.
FAST FRED |