12 Threads found on edaboard.com: 12v To 19v
I have a asus router with a power rating of 19v @ 1.58A max for which I need battery backup for 1~2 hrs daily because of power outages.
Now I have 12v 7AH exide battery of an old ups which still works.
I also have a 12v 2A power adapter and a universal laptop charger which provide variable voltage from 15V to 18V at 4A and from 20V to (...)
Hobby Circuits and Small Projects Problems :: 11-05-2015 04:43 :: iamsuperuser :: Replies: 7 :: Views: 418
Depends greatly on your heatsink thermal resistance how much current and heat rise to say 70'C
I succesfully use 4S on 12v on AWG18 with 30AWG drops for Rs equalization of 0.1Ohm or 6S on 18 or 19v or 8S on 24V or 24S on 48V. So no loss on regulator and adjust supply drop with long wire suitable guage for 100% voltage matched between supply an
Analog Circuit Design :: 07-05-2015 14:30 :: SunnySkyguy :: Replies: 51 :: Views: 2206
If using prewired Molex then 12v and 5V is correct.
19v will burn out some components.
go to BIOS to check CDROM is present and jumpered correctly on drive if using ribbon cable.
Power Electronics :: 07-05-2015 03:05 :: SunnySkyguy :: Replies: 32 :: Views: 1251
Your 14 VAC transformer puts out 19v peaks. This is sufficient amplitude to provide bursts of current to a 12v battery.
This simulation shows a charging session (theoretical). Battery voltage starts at
Power Electronics :: 05-25-2014 17:56 :: BradtheRad :: Replies: 3 :: Views: 1475
I would like to reproduce using a 24V battery in order to test a device a solar panel that delivers 18-19v with a maximum current of 300mA. I have built a regulator using the L200 IC with both voltage and current regulation: when the load required more than 300mA the output voltage dropped to 12v. I have also built a current limiter using two PNP t
Analog Circuit Design :: 04-04-2014 12:40 :: gmarocco :: Replies: 1 :: Views: 949
pls can 0.33uF as input, CI and 0.1uF, Co, output capacitors withstand a 12v 5A DC SUPPLY! IF NOT, is there a calculator or formular for determining the values of input and output capacitors to be used in any DC supply circuit!
Analog Circuit Design :: 01-31-2011 18:50 :: snazzy c :: Replies: 5 :: Views: 1757
Convert to use laptop in car. Thanks a lot
Other Design :: 10-20-2010 14:00 :: tranhongphuoc :: Replies: 3 :: Views: 3519
You will need a DC/DC converter like the one in this link
Unfortunately a 12v/7Ah battery will be not enough to power your laptop for about 12 hours.
Let's assume your laptop will require 3A at 19v: it is 57Wh. Multiplied for 12 hours it will be 684W/12h
Your 12v battery capacity is 84Wh, so ass
Analog Circuit Design :: 08-30-2010 16:14 :: bepobalote :: Replies: 3 :: Views: 1021
Basically i have 19v 4A laptop PSU, i have want to use it for my IDE->USB converter as is orignal PSU unit gives 1 amp on both 12v and 5v,
i know that i can use 7805/7812 directly but there output is 1A, is there any way i can get 2A on both out using simple schematic ?
please help me
Power Electronics :: 03-31-2010 02:10 :: daemon123 :: Replies: 5 :: Views: 3162
I think the item you require is in-car dc-dc converter (12v to 19v).
It is sold in computer shop & used to charge Laptop in a vehicle.
If you're thinking of building one yourself there's quite a number of projects available in the Net.
One using the MC34063 or the TL494 are quite common.
Hobby Circuits and Small Projects Problems :: 01-13-2010 04:38 :: dindeds :: Replies: 5 :: Views: 4085
Hi, i need to build a step-up converter which has an input range about 12v to 13.8v. The input needs to be step-up to 18.5/19v. The problem lies with the output current as it must be able to generate a max of 3.5A to the load.
This is for typically laptop purpose.thx.
Any schematics or suggestions?..
Power Electronics :: 09-25-2009 07:07 :: john90 :: Replies: 6 :: Views: 1536
Elektor have done an easy-to-build 12v car battery in/19v 5A '3524-based Laptop
Adaptor with PCB layout that can be adapted to give you suitable outputs by
amending the 56uH series chopper inductor - I'll post the article as soon as I can
find it - is it any use?
PS! Eurocircuits can supply old Elektor PCBs - I got on
Hobby Circuits and Small Projects Problems :: 04-01-2009 07:29 :: Chris56000 :: Replies: 1 :: Views: 4668