the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
icon

how to convert volts into amps


Post ReplyPost New Topic
< Prev Topic Next Topic >
anonymous1 
Copper - Posts: 151
Copper spacespace
Joined: October 25, 2009
Location: Washington, United States
Posted: June 13, 2010 at 9:32 PM / IP Logged  

I thought this thread would be juicier . . . (no pun intended)

There's nothing wrong in asking for a voltage to current converter, or it's applications.

The OP just used the wrong nomenclature as do a lot of folks.

His original requirements was being able to pwr the 2 devices of different voltages from his 12v supply, which is a pretty easy and low tech thing to accomplish.

Sears sells an adapter that gives 5v, 6v, 9, 12, and some other volts, with various connector ends, for around $10.

He could also get a 7805 and that would probably work ok, or an LM7806, use an LM317. Or a zener diode and transistor.

Both of the devices he has uses very low current so this wouldnt be an issue.

DYohn is correct, volts and amps are 2 different things, but if you have an abundance of one, you can create an abundance of another.

I know just enough to be dangerous. VERY dangerous.
oldspark 
Gold - Posts: 4,913
Gold spacespace
Joined: November 03, 2008
Location: Australia
Posted: June 13, 2010 at 9:54 PM / IP Logged  
I've been buying 12-24V chargers for phones etc for $1.60 to $3 (brand new from shops).
They use the MC34063 dc-dc converter chip inbuilt into a quality fused cig-socket.
Snip off the phone connector; modify components for whatever output...
Bargain of you ask me.
Cheaper than the LM series; ~90% efficiency, and cheaper than the smps version of the LM series that sell for $20!
The above is merely FYI after seeing the $20 SMPS-LM equivalent on another site. Even full-priced phone chargers are only ~$15. (The other site being one full of code & hardware hackers.)
For this application - I'd be tempted with a series resistor, though I'd probably add a zenor & fuse for protection.... But if the internal batteries are to be used, it doesn't matter.... (I'd use one switch to power both devices thru a voltage converter...)
haemphyst 
Platinum - Posts: 5,053
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: June 13, 2010 at 10:48 PM / IP Logged  
Simple three-pin 78xx voltage regulators is a perfect method to do what you need, AND you will be able to power them both, easily, through the trunk pin.
They are SIMPLE to wire, need no heat-sink up to about .5A, and you'll wonder how you ever got along without them! LOL They are small enough that you can probably even get them IN THE CASES of your projects, then all you have to do is wire the switched 12 volts right to the project box!
how to convert volts into amps - Page 2 - Last Post -- posted image.
Easy peasy. Don't make it any more difficult on yourself than you have to! For less than $10, plus time, you are done.
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
still_walkin 
Silver - Posts: 644
Silver spacespace
Joined: April 18, 2007
Location: California, United States
Posted: June 13, 2010 at 10:58 PM / IP Logged  
Send me a link where I can buy it
1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"
haemphyst 
Platinum - Posts: 5,053
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: June 13, 2010 at 11:47 PM / IP Logged  
ANY respectable electronics store will stock them. The Shack might have to special order the 9V, but I'm pretty certain the 5V is a stocked item. (SKU 276-1770) (EDIT: The 9V is not listed even as a special order item.)
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
anonymous1 
Copper - Posts: 151
Copper spacespace
Joined: October 25, 2009
Location: Washington, United States
Posted: June 15, 2010 at 1:23 AM / IP Logged  

haemphyst wrote:
Simple three-pin 78xx voltage regulators is a perfect method to do what you need, AND you will be able to power them both, easily, through the trunk pin.

Now why didnt I think of that?  :D

He can run the 12v in the project housing through a 1A fuse, and pwr both ICs at the same time. All the grounds go together, and the + output for each goes to the center pin of the connectors he buys.

He can use a single pole rocker switch at the 12v side to pwr on both ICs. The whole thing will be in a case the size of a tin of Altoids.

.

I know just enough to be dangerous. VERY dangerous.
still_walkin 
Silver - Posts: 644
Silver spacespace
Joined: April 18, 2007
Location: California, United States
Posted: June 15, 2010 at 2:30 AM / IP Logged  
I thinkm. The smallest fuse I have in my cars fuse box is 3amp. Ur saying add the regulator after I tap into the fuse
1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"
haemphyst 
Platinum - Posts: 5,053
Platinum spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: January 19, 2003
Location: Michigan, Bouvet Island
Posted: June 15, 2010 at 8:10 AM / IP Logged  
You can get your 12V source from anywhere. ADD A FUSE before the regulator(s), and as long as the fuse you add is a smaller current value than the circuit you tap in the fuse block/panel then you're golden. As mentioned, a 1A would very likely be plenty, and would easily pop before the "smallest" 3A in your fuse box.
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
still_walkin 
Silver - Posts: 644
Silver spacespace
Joined: April 18, 2007
Location: California, United States
Posted: June 22, 2010 at 12:10 PM / IP Logged  
heres the update i checked my fuse box and the smallest fuse i have is 10a. so if i use a smaller guage wire i can tap into it. or i can go the route with the cig charger . i pefer the first however if i did the cig i would hard wire it to the fuse box anyways . so im assuming the advantage is the chip in the cig charger....
1993 sdv
Alpine 4x6 6x9 5 1/4 swr-10d4
alpine v60
12.5 VGA flip down
Nettop pc w/10" touch screen
78nova
5-re audio 5x7 ,10" sub &
Xtx-500.5
"Take the faceplate off get the jumperpack"
Page of 2

Sorry, you can NOT post a reply.
This topic is closed.

  Printable version Printable version Post ReplyPost New Topic
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot delete your posts in this forum
You cannot edit your posts in this forum
You cannot create polls in this forum
You cannot vote in polls in this forum

  •  
Search the12volt.com
Follow the12volt.com Follow the12volt.com on Facebook
Friday, January 27, 2023 • Copyright © 1999-2023 the12volt.com, All Rights Reserved Privacy Policy & Use of Cookies
Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

Secured by Sectigo
the12volt.com spacer
the12volt.com spacer
the12volt.com spacer
Support the12volt.com
Top
the12volt.com spacer
the12volt.com spacer