|
 ShockValue
Because, ShockValue.
Registered: 11/18/08
Posts: 5,008
Loc: Tipping at windmills.
|
 In theory - (electronics) 
#12704597 - 06/07/10 07:35 PM (2 years, 11 months ago) |
|
|
OK, so I have a portable hard drive with a power brick that puts out 12V and 1000mA. In theory I should be able to just chop off the brick and hard-wire it straight into my cars power since it's 12V right? If I understand correctly, as long as the car can provide 1000mA it will only take what it needs, and not blow the thing up.... But I figured I better verify before I nuke something 
--------------------
- When we built temples to view the stars, we knew about all 2000 of them.
|
Doc_T
Random Dude
 
Registered: 03/06/09
Posts: 42,395
Loc: Colorado 
|
Re: In theory - (electronics) [Re: ShockValue]
#12704625 - 06/07/10 07:41 PM (2 years, 11 months ago) |
|
|
Sure, I guess. Unless it needs more voltages.
--------------------
You make it all possible. Doesn't it feel good?
|
ShockValue
Because, ShockValue.
Registered: 11/18/08
Posts: 5,008
Loc: Tipping at windmills.
|
Re: In theory - (electronics) [Re: Doc_T]
#12704666 - 06/07/10 07:47 PM (2 years, 11 months ago) |
|
|
Only if I turn it up to 11.
--------------------
- When we built temples to view the stars, we knew about all 2000 of them.
|
luvdemshrooms
Two inch dick..but it spins!?
Registered: 11/29/01
Posts: 24,881
Loc: Lost In Space
|
Re: In theory - (electronics) [Re: ShockValue]
#12704674 - 06/07/10 07:48 PM (2 years, 11 months ago) |
|
|
What are you trying to accomplish?
--------------------
“In politics, few talents are as richly rewarded as the ability to convince parasites that they are victims. Welfare states on both sides of the Atlantic have discovered that largesse to losers does not reduce their hostility to society, but only increases it. Far from producing gratitude, generosity is seen as an admission of guilt, and the reparations as inadequate compensation for injustices – leading to worsening behavior by the recipients.
Thomas Sowell
|
ShockValue
Because, ShockValue.
Registered: 11/18/08
Posts: 5,008
Loc: Tipping at windmills.
|
|
Trying to power my external hard drive in my glove box without the need for an inverter.
--------------------
- When we built temples to view the stars, we knew about all 2000 of them.
|
luvdemshrooms
Two inch dick..but it spins!?
Registered: 11/29/01
Posts: 24,881
Loc: Lost In Space
|
Re: In theory - (electronics) [Re: ShockValue]
#12704720 - 06/07/10 07:56 PM (2 years, 11 months ago) |
|
|
Automotive charging systems are not as regulated as PC power supplies. As a result I'm not sure. As well I believe hard-drives need both a 5 volt and a 12 volt source.
--------------------
“In politics, few talents are as richly rewarded as the ability to convince parasites that they are victims. Welfare states on both sides of the Atlantic have discovered that largesse to losers does not reduce their hostility to society, but only increases it. Far from producing gratitude, generosity is seen as an admission of guilt, and the reparations as inadequate compensation for injustices – leading to worsening behavior by the recipients.
Thomas Sowell
|
Doc_T
Random Dude
Registered: 03/06/09
Posts: 42,395
Loc: Colorado
|
|
See what your voltmeter says.
I think the 12v line is for runnig motors and such, and so doesn't need extreme regulation.
--------------------
You make it all possible. Doesn't it feel good?
|
ShockValue
Because, ShockValue.
Registered: 11/18/08
Posts: 5,008
Loc: Tipping at windmills.
|
Re: In theory - (electronics) [Re: Doc_T]
#12704791 - 06/07/10 08:11 PM (2 years, 11 months ago) |
|
|
You guys are lunatics. Everything in a car runs on 12v 
Radio, lights, seat heaters, trunk latch etc etc.
--------------------
- When we built temples to view the stars, we knew about all 2000 of them.
|
luvdemshrooms
Two inch dick..but it spins!?
Registered: 11/29/01
Posts: 24,881
Loc: Lost In Space
|
Re: In theory - (electronics) [Re: Doc_T]
#12704800 - 06/07/10 08:13 PM (2 years, 11 months ago) |
|
|
I just looked it up.
12v - hard drive motor
5v - hard drive electronics
It needs both.
as an aside..... SATA drives also use a 3.3 volt supply
--------------------
“In politics, few talents are as richly rewarded as the ability to convince parasites that they are victims. Welfare states on both sides of the Atlantic have discovered that largesse to losers does not reduce their hostility to society, but only increases it. Far from producing gratitude, generosity is seen as an admission of guilt, and the reparations as inadequate compensation for injustices – leading to worsening behavior by the recipients.
Thomas Sowell
|
ShockValue
Because, ShockValue.
Registered: 11/18/08
Posts: 5,008
Loc: Tipping at windmills.
|
|
--------------------
- When we built temples to view the stars, we knew about all 2000 of them.
|
Doc_T
Random Dude
Registered: 03/06/09
Posts: 42,395
Loc: Colorado
|
Re: In theory - (electronics) [Re: ShockValue]
#12704906 - 06/07/10 08:40 PM (2 years, 11 months ago) |
|
|
Quote:
ShockValue said:
You guys are lunatics. Everything in a car runs on 12v
Radio, lights, seat heaters, trunk latch etc etc.
I meant within the drive.
The car stuff doesn't care if it's getting 11v or 16v.
--------------------
You make it all possible. Doesn't it feel good?
|
ShockValue
Because, ShockValue.
Registered: 11/18/08
Posts: 5,008
Loc: Tipping at windmills.
|
Re: In theory - (electronics) [Re: Doc_T]
#12705684 - 06/07/10 11:03 PM (2 years, 11 months ago) |
|
|
Got impatient. Made it work. Now I have 120GB of music in my glove box.
  
--------------------
- When we built temples to view the stars, we knew about all 2000 of them.
|
 davegrant73
Stranger
Registered: 09/26/09
Posts: 103
Loc: southeast, usa
Last seen: 2 years, 8 months
|
Re: In theory - (electronics) [Re: ShockValue]
#12768365 - 06/19/10 12:00 PM (2 years, 10 months ago) |
|
|
haha, fucking awesome!
--------------------
"I’d rather to be poor and clean and humble than to be rich in mansions"
Scientist - Cloning Process
|
Link
Intrinsically No Good
Registered: 07/29/99
Posts: 2,307
Loc: Lost Woods, Hyrule
|
Re: In theory - (electronics) [Re: davegrant73]
#12775118 - 06/20/10 08:35 PM (2 years, 10 months ago) |
|
|
The drive might not last too long. Voltage output varies a lot in a car, 10-18V. That power brick supplies much cleaner power. In general, the dirtier the power supply, the shorter the electronics lifespan. I'll be interested to hear how it fairs.
--------------------
Wonder had gone away, and he had forgotten that all life is only a set of pictures in the brain, among which there is no difference betwixt those born of real things and those born of inward dreamings, and no cause to value the one above the other. -- H.P. Lovecraft "The Silver Key"
|
Fleadh
Eh No....
Registered: 05/11/09
Posts: 2,355
Loc: Ireland 
|
Re: In theory - (electronics) [Re: Link]
#12777218 - 06/21/10 05:10 AM (2 years, 10 months ago) |
|
|
yea, It will work for a while but will die.
It should be fairly obvious what happening as when you get in your car and turn on the your headlights they arent very bright but as soon as you turn on your engine they brighten up consideribly.
--------------------
Friendships have come and gone but I always regret the girls I didn't bang
I just dont really care what you think
|
lastlokean
Stranger
Registered: 07/30/07
Posts: 106
Last seen: 3 months, 5 days
|
Re: In theory - (electronics) [Re: Fleadh]
#12777695 - 06/21/10 10:31 AM (2 years, 10 months ago) |
|
|
Adding a decent capacitance between your vcc and gnd will help reduce the power swings, but won't stop it completely. Best bet would be to go to digikey or some other electronic provider, buy a small fixed voltage regulator rated at more current than you need and in conjunction with a capacitor between the voltage and ground you will have a dramatically more stable power supply...
--------------------
Recipe:
How a Lokean makes chocolates
For a fully enclosed gh with a coolmist piped in, one may find that adding one of these to the opposite end as the intake will seriously help reduce pressure buildup and strain on the poor weak coolmist motor, while also dramatically improving fae without cutting polyfill stuffed slits all over the damn thing. (That looks suspicious  )
|
ShockValue
Because, ShockValue.
Registered: 11/18/08
Posts: 5,008
Loc: Tipping at windmills.
|
Re: In theory - (electronics) [Re: lastlokean]
#12777747 - 06/21/10 10:50 AM (2 years, 10 months ago) |
|
|
The drive is an old POS anyway, so I'm not all that worried about it. I'll let you know when/if it dies 
--------------------
- When we built temples to view the stars, we knew about all 2000 of them.
|
Seuss
Error: divide byzero
Registered: 04/27/01
Posts: 23,394
Loc: Caribbean
Last seen: 3 months, 7 days
|
Re: In theory - (electronics) [Re: lastlokean]
#12783058 - 06/22/10 07:34 AM (2 years, 10 months ago) |
|
|
> Adding a decent capacitance between your vcc and gnd will help reduce the power swings, but won't stop it completely.
Adding a capacitor will help with power swings, but will not help regulate the voltage. (Power is a function of current and voltage.)
> buy a small fixed voltage regulator rated at more current than you need and in conjunction with a capacitor between the voltage and ground you will have a dramatically more stable power supply...
A better solution would be a buck/boost DC/DC converter since the voltage in a car battery can swing fairly widely (+ or - 4V) from the 12V nominal.
--------------------
Just another spore in the wind.
|
ShockValue
Because, ShockValue.
Registered: 11/18/08
Posts: 5,008
Loc: Tipping at windmills.
|
Re: In theory - (electronics) [Re: Seuss]
#12783377 - 06/22/10 10:41 AM (2 years, 10 months ago) |
|
|
Yeah I was eyeballing one of those DC/DC converters for my laptop. It takes 15v so I would need to up it a bit from the car power.
--------------------
- When we built temples to view the stars, we knew about all 2000 of them.
|
Seuss
Error: divide byzero
Registered: 04/27/01
Posts: 23,394
Loc: Caribbean
Last seen: 3 months, 7 days
|
Re: In theory - (electronics) [Re: ShockValue]
#12787270 - 06/22/10 10:42 PM (2 years, 10 months ago) |
|
|
> It takes 15v
That is why you need a buck/boost DC/DC converter centered at 12V. Buck lowers the voltage down from something higher and boost raises the voltage up from something lower. A buck/boost does both. Depending upon the design and load, efficiency can vary widely... anything from 95% down to horrid.
--------------------
Just another spore in the wind.
|
|
Images only 
Threaded
Previous
Index
Next
Edit 
Reply 
