18 Threads found on edaboard.com: 12v To 19v
would there be a problem if I use two different AC wall adpater and connect their output in series to obtain a desired voltage to charge the battery? I have a 12v adapter and an adjustable AC adapter. One is 800mAh and the other is rated at 1.5A. My charge current will be under 800mAh.
My battery requires 19v but there aren't a lot of cheap
Hobby Circuits and Small Projects Problems :: 09.10.2005 12:16 :: david90 :: Replies: 5 :: Views: 1677
i want a dc 24v to dc 12 v powersupply. for a 12v power amplifier from a 24 v battery supply in vehicle.
How much output current do you require?
Analog Circuit Design :: 16.06.2006 15:14 :: lambtron :: Replies: 14 :: Views: 9235
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 :: 13.01.2010 04:38 :: dindeds :: Replies: 5 :: Views: 3197
Convert to use laptop in car. Thanks a lot
Other Design :: 20.10.2010 14:00 :: tranhongphuoc :: Replies: 3 :: Views: 2185
19v @4 Amps SOUNDS like a LAPTOP power Supply! . In any case ..You should be able to buy one with a 220v or 110V input depending where you live .Now to convert from 12 V DC to 110 or 220V AC.You need a Voltage inverter .any small one will do ! ( you only 100 watts)..
This is the cheapest solution .Now to design a straight 13.5 V to 19 Volt .
Hobby Circuits and Small Projects Problems :: 22.07.2009 20:53 :: eltonjohn :: Replies: 8 :: Views: 6617
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 :: 25.09.2009 07:07 :: john90 :: Replies: 6 :: Views: 1202
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 :: 31.03.2010 02:10 :: daemon123 :: Replies: 5 :: Views: 1906
I want to design a boost converter with conditions:
1. Input 12v/10A
2. Output 36v/3A
3. Fre <= 50Khz
Can you help me for this design? Thank you so much.
Power Electronics :: 28.11.2010 21:46 :: letan :: Replies: 1 :: Views: 827
The voltage from the unregulated 12/1500 source is to low ..
If you don?t have alternative power source (roughly 18Vdc/1A) you can step up 12v (unregulated) to 17-18V dc using something like the LM2577 and then with the LM317 in a constant current configuration charge both 6V and 12v batteries ..
Hobby Circuits and Small Projects Problems :: 12.01.2011 19:33 :: IanP :: Replies: 4 :: Views: 4528
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 As Nandhu told, your querry is not clear, but as i understood, you are asking about connec
Analog Circuit Design :: 01.02.2011 01:51 :: pranam77 :: Replies: 5 :: Views: 1333
We are doing TPS40210 boost converter.
Vin = 12v
Vout = 19v
Iout(max) = 1.62A
F(sw) = 500KHz (Sync'd with diode method)
C(in) = 20uF ceramic
C(out) = 20uF ceramic, then 1.5uH series inductor, then 10uF ceramic capacitor.
Current sense resistor =
Power Electronics :: 04.02.2012 11:30 :: grizedale :: Replies: 3 :: Views: 623
I am making a flyback transformer with input 33V output 12v using UC3842. So my flyback transformer have 3 winding: Primary, secondary, bias
Volt bias = 18V (UC3842) + 1V (diode FR207) = 19v. I choose 20V
I choose Te=0.5, inferred that Ns=Te * 12v = 6 Turns
Np= Ns*Vin/(Vout +Vd) = (...)
Power Electronics :: 26.12.2012 06:57 :: vantusaonho :: Replies: 4 :: Views: 537
I would first get a good digital volt meter like a Fluke 115, it will serve you well for a very long time. If you don't want to spend so much there are fair meters for much less. You need to measure the voltage before you connect it to the Thrustmaster. I would also measure the hair dyer power supply to see what you already connected.
Many lap top
Hobby Circuits and Small Projects Problems :: 03.07.2013 18:15 :: HMS1021 :: Replies: 1 :: Views: 316
boost DC-DC 10V-32V to 12v-35V DC DC voltage power con
Power Electronics :: 11.07.2013 23:49 :: chenxiaotao :: Replies: 0 :: Views: 34
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 :: 01.04.2009 07:29 :: Chris56000 :: Replies: 1 :: Views: 4298
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 :: 30.08.2010 16:14 :: bepobalote :: Replies: 3 :: Views: 701
It is a dual-phase inverter with dimensions of 97mm x 59mm x 16mm. You can reach 5,5A for Uout=19v and 7A for Uout=15V at input voltage 12v. The higher voltage 14V at the input (the car engine on), you can obtain 6,5A for Uout=19v a
Show DIY :: 18.12.2011 19:06 :: Vermes :: Replies: 0 :: Views: 498
When plugged in the power supply makes a quiet ticking noise, it sounds like something is trying to trigger, but never actually does.
It seems this indicate a variety of problems that sometimes can be related to a bad capacitor. If you're lucky you may be able to repair the unit by replacing some electrolytic capacitors in the po
Power Electronics :: 19.04.2012 02:16 :: mister_rf :: Replies: 6 :: Views: 413