5th & 6th Generation (2002-2006 & 2007-2011)Toyota Camry Discussion for years: 2002-2006 & 2007-2011
Topics of discussion range from fuel economy, safety, modifications, performance all involving America's favorite family car, the Toyota Camry.
i bought a rca wifi video media module from walmart this black friday, well fought for trust you me. And best of all i can pair it with my phone... WHICH meand i can use my erisin 7in head unit to play netflix, hulu, and youtube at will... on the road... while moving!
Problem is i want to put it in line with an accessory 12v source, probably just the power source for my head unit, and problem being is i'm not 100 percent sure on how to take the 12 v source dc down to 5v dc required for my little module. My best guess is a voltage divider, using 700 ohm and 500 ohm resitors. That i could do. But i'v never done that, and am not sure if that is the safest way to go about it, ANYONE having wired an foreign device to their camry let me know how you went about it plz!
i bought a rca wifi video media module from walmart this black friday, well fought for trust you me. And best of all i can pair it with my phone... WHICH meand i can use my erisin 7in head unit to play netflix, hulu, and youtube at will... on the road... while moving!
Problem is i want to put it in line with an accessory 12v source, probably just the power source for my head unit, and problem being is i'm not 100 percent sure on how to take the 12 v source dc down to 5v dc required for my little module. My best guess is a voltage divider, using 700 ohm and 500 ohm resitors. That i could do. But i'v never done that, and am not sure if that is the safest way to go about it, ANYONE having wired an foreign device to their camry let me know how you went about it plz!
Some questions;
What type of adapter is the power plug, round/square/usb?
How much current does it require at 5 volts?
Have you looked at the AC power adapter for how much current it can supply and the voltage?
There are 12v to 5v DC converters that plug into the power accessory outlet in the "cubbie" behind the door, and they are regulated and filtered. Your 2 resistor idea isn't too practical for this application.
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2011 XLE, I4, AT, Sliver, New May 1, 2010
MFG 02/25/2010 Stock, Shucks!
"Kinda Hard to ID in a Parking Lot"
Last edited by Luna2; 11-26-2011 at 02:18 AM.
Reason: Another Question
Some questions;
What type of adapter is the power plug, round/square/usb?
How much current does it require at 5 volts?
Have you looked at the AC power adapter for how much current it can supply and the voltage?
There are 12v to 5v DC converters that plug into the power accessory outlet in the "cubbie" behind the door, and they are regulated and filtered. Your 2 resistor idea isn't too practical for this application.
Here is the thing i don't want cords swarming my car taking up plugs, i wanted a direct line tapped into the a existing 12v power source. The device requries 5v at 1amp.
Ya I saw that and thanks for the link that is a sure fire option, but id like to exaust all cheaper options first. Whats the reason behind a voltage divider with a few resistors not working. It seems like that's all that 30$ module does
Ya I saw that and thanks for the link that is a sure fire option, but id like to exaust all cheaper options first. Whats the reason behind a voltage divider with a few resistors not working. It seems like that's all that 30$ module does
1. Less intense heat. (12.6v - 5v = 7.6v drop with the engine off, 13.8v - 5v = 8.8v, Watts of heat produced is (E x I = P) so 7.6v x 1a = 7.6w and 8.8v x 1a = 8.8w)
2. Regulated output. (The voltage divider will have a change on it's input voltage from 12.6 engine not running, to 13.8 after the engine is running and the output will swing from 5v to 6.2v.) [Not to mention the voltage drop while you are cranking the engine over.]
3. Voltage spikes right after you use the starter could be as high as 20 plus volts.
4. DC filtered output. Eliminated the noise that all automotive electrical systems produce.
5. Input protected.
There are other choices like using switching mode (PWM) DC to DC converters, that are physically smaller and produce a lot less heat.
__________________
2011 XLE, I4, AT, Sliver, New May 1, 2010
MFG 02/25/2010 Stock, Shucks!
"Kinda Hard to ID in a Parking Lot"
"There are other choices like using switching mode (PWM) DC to DC converters, that are physically smaller and produce a lot less heat.[/QUOTE]"
And its important ot keep in mind i bought this wifi media device for 40 bucks, its hard to bring myself to spend 30 bucks more.
Sounds like most of the variant in potential occur at startup, so if i were to install a simple switch inline and wait until the car was up and running to power my unit, would that be constant enough to be safe?
I searched pwm dc to dc converters, sounds cool. Do they only come in chip form would i need to get a lil breadboard to make us of it. Also i'm having trouble finding one specific for my needs, can you give me an example.
"There are other choices like using switching mode (PWM) DC to DC converters, that are physically smaller and produce a lot less heat.
"
And its important ot keep in mind i bought this wifi media device for 40 bucks, its hard to bring myself to spend 30 bucks more.
Sounds like most of the variant in potential occur at startup, so if i were to install a simple switch inline and wait until the car was up and running to power my unit, would that be constant enough to be safe?
I searched pwm dc to dc converters, sounds cool. Do they only come in chip form would i need to get a lil breadboard to make us of it. Also i'm having trouble finding one specific for my needs, can you give me an example.[/QUOTE]
The chargers/adapters are not that hard to find. Flea-Bay not my first choice, but will do in a pinch...
This was i can have the safe voltage step down the the car plug provides while still being able to hide it somewhere in the dash and keep my lighter plugs open. Much thanks for y'all for helpin, i'll post pictures and results!
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Linear Mode
