9 Threads found on edaboard.com: 12v To 19v
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: 923
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: 480
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: 1624
Convert to use laptop in car. Thanks a lot
Other Design :: 10-20-2010 14:00 :: tranhongphuoc :: Replies: 3 :: Views: 3194
I would like to design and build a DC-DC converter with following specifications.
Input : 12vDC 7Ah from ups deep-cycle battery
Output:19vDC 3A to a laptop.
How can i setup the DC battery voltage supply system so that i can have it running for at least 12 hours without recharging?
Analog Circuit Design :: 08-30-2010 14:59 :: laserblade777 :: Replies: 3 :: Views: 937
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: 2676
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: 3763
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: 1435
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: 4550