55 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 18:16 :: david90 :: Replies: 5 :: Views: 1479
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 21:14 :: lambtron :: Replies: 14 :: Views: 8033
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 10:38 :: dindeds :: Replies: 5 :: Views: 2743
Convert to use laptop in car. Thanks a lot
Other Design :: 20.10.2010 20:00 :: tranhongphuoc :: Replies: 3 :: Views: 1609
I have wired up the following image is reversed such that the pinout matches that of the actual chip.
And the component values in this circuit are not what I have actually used.
My own calulcations are as follows:
VOUT (V): 17.500000
IOUT (mA): 5
Power Electronics :: 31.08.2012 07:34 :: boylesg :: Replies: 21 :: Views: 807
12v 5A switched power supply
Power Electronics :: 02.05.2013 15:44 :: tpetar :: Replies: 7 :: Views: 264
I hope you have connected your lamps in this
Please add resistor when applying the 20V to the gate, I think you'r applying the maximum 20V to the gate terminal, as I have seen in the datasheet with the name of GATE-EMITTER V
Microcontrollers :: 08.02.2008 18:13 :: umery2k75 :: Replies: 9 :: Views: 2201
I have made a 12v DC to 280V AC inverter using 2N3055 in push pull amplifier design and stepup transformer. But performance is not upto expectations. with three transistors attached to both sides of center taped 12v winding, the circuit calims to give 500W output but in actual it gives around 160W ouput, while the output of single 2N3055 is around
Analog Circuit Design :: 13.09.2008 08:02 :: maijaz99 :: Replies: 37 :: Views: 9496
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 :: 23.07.2009 02:53 :: eltonjohn :: Replies: 8 :: Views: 5832
i had modify some changes to my testing. Presently, i am using a 25 W panel which was connected to a solar controller to charge a 12v 4Ah lead acid battery. The load output of my controller was connected to a converter which steps up the voltage to 19v which was than plug into my laptop.
Previously, there was no lead acid battery and c
Hobby Circuits and Small Projects Problems :: 14.09.2009 15:34 :: john90 :: Replies: 17 :: Views: 5202
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 13:07 :: john90 :: Replies: 6 :: Views: 1111
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 08:10 :: daemon123 :: Replies: 5 :: Views: 1473
'suitable plug' ?
it means you are directly giving 12v.
What is the supply voltage for HAIER?
use an adapter for 12v to reqd voltage .
Electronic Elementary Questions :: 17.05.2010 05:57 :: srizbf :: Replies: 11 :: Views: 2402
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 22:14 :: bepobalote :: Replies: 3 :: Views: 599
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 :: 29.11.2010 03:46 :: letan :: Replies: 1 :: Views: 704
input voltage is 12v dc. i really want to see the physical connection of the heat sink with the 7812 regulator.
Have a look at the attached pcture ..
And, btw, if the input voltage is 12vdc and you want to supply 12v-devices - what do you need a regulator for?
Just connect 12vdc to a 12v-device (...)
Electronic Elementary Questions :: 30.11.2010 03:14 :: IanP :: Replies: 9 :: Views: 1583
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 :: 13.01.2011 01:33 :: IanP :: Replies: 4 :: Views: 3236
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 :: 01.02.2011 00:50 :: snazzy c :: Replies: 5 :: Views: 1157
HI Guys. (You have to read it fully to understand my Problem)
I have to use my laptop for longer period that is to say i have to download movies so i keep it on for days and thats how my laptop battery was wasted as it is recommended to remove battery if u have to used laptop for a long time. I can run it directly on charger but load shedding is
Power Electronics :: 19.06.2011 14:32 :: Sajjadkhan :: Replies: 2 :: Views: 437
LM2575 datasheet says: "For an input voltage of 12v or more, the maximum available output current in this configuration is approximately 0.35A. At lighter loads, the minimum input voltage required drops to approximately 4.7V". So it seems a higher input voltage should work better (like 19v from laptop supply).
And: "the output capacitor values m
Professional Hardware and Electronics Design :: 18.12.2011 22:48 :: RetroTechie :: Replies: 5 :: Views: 1001
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 17:30 :: grizedale :: Replies: 3 :: Views: 458
But I am using DC 12v,
If using DC, i dont need these arrangements ?
Microcontrollers :: 11.03.2012 14:15 :: Rohith_elec :: Replies: 94 :: Views: 1454
Want to power 24-led's for an emergency lighting project for when the power goes out.
Will be running off a 12 Volt deep cell marine battery that is charged by solar panels.
Led Specs- 3.2-3.4v 20mA each X 24 =480mA total
I am currently using these to go from 12 Volt to 5V.
The reason i'm using them is because I have alot of these & can
Hobby Circuits and Small Projects Problems :: 14.03.2012 05:52 :: campus189 :: Replies: 11 :: Views: 1397
Objective: Design a Boost Converter with this spec :
For my calculation
Then i simulate the circuit in both MATLAB and PSIM and i get the voltage just around 2A !!!
So, how i get the 4.7A as output?.i try the change D bu
Power Electronics :: 24.03.2012 10:48 :: recon1729 :: Replies: 9 :: Views: 604
I want to made solar charging system ither for 12v or 24V battery.
actually i am trying to run load of my home at batteries charged through solar panels.
I have two solar panels
Professional Hardware and Electronics Design :: 11.05.2012 11:26 :: shahbaz.ele :: Replies: 11 :: Views: 2443
After a week and a half of hair tearing frustration and agrivation I have finally done it.
I have found a discrete transistor voltage doubler that works nicely in the usual direction but that I was also able to modify and get it to work in the reverse direction, i.e. -12v to -24V
All I did was swap all the NPNs for PNPs, reversed the polarity of
Analog Circuit Design :: 10.08.2012 11:29 :: boylesg :: Replies: 18 :: Views: 731
I have wired up one of these circuits as per one of the online used 100uH inductor but I don't know how accurate my Rsc is.
I used 3 x 0.22R resistors in parallel which my multimeter measures at 0.4R. Individually each measures about 0.6R.
Analog Circuit Design :: 19.08.2012 16:46 :: boylesg :: Replies: 20 :: Views: 757
my power supply is capable of 12v and 50A, also, as i said, with grouded pin 3, i draw 5A from power supply without any problems and i didn't noticed any noise from SMPS. Voltage was 23.9V at 0A and at 5A load.
Hobby Circuits and Small Projects Problems :: 01.12.2012 20:32 :: hazzard043 :: Replies: 9 :: Views: 486
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 12:57 :: vantusaonho :: Replies: 4 :: Views: 250
The circuit doesn't provide reliable current limiting. The maximum output current depends on input voltage and transistor current gain.
What do you mean that it doesn't provide reliable current limiting?
Do you mean the current gain of the transistor varies with the voltage and therefore the current limit will also
Hobby Circuits and Small Projects Problems :: 11.03.2013 13:36 :: boylesg :: Replies: 9 :: Views: 311
Since some of the input current is used up in the conversion process, I decided to opt for a higher capacity cell. A 7000mAH should do it, right?
There should still be surplus current for an output of 4-5amps with a 7000mAH cell, right?
I think I've heard a 1.5V D cell can put out 10 or 20 A.
If you are aiming for 12v output at 4
Power Electronics :: 18.03.2013 21:51 :: BradtheRad :: Replies: 13 :: Views: 293
Sorry, i am using AT89C52 U2 and U4....
Please can you tell me the Q2, Q3 and Q5, Q6 ON condition...., now my status is Q3 and Q6 Base always around 0.7Volt? and my VPC=5.3V and VPP=5.1V is it any problem with my circuit or anything else?
Can you check for me the circuit? Is it any problem with the circuit....
Microcontrollers :: 05.08.2005 05:28 :: Help :: Replies: 11 :: Views: 1364
I am a poly student and i have to explain the working of a car lap adaptor (12v-19v) which has an ic TN598CN(pluse width modulation),
P60NF06(N-CHANNEL 60V 0.014 OHM 60A TO-220 STRIPFET POWER MOSFET),STPS20H100CT(HIGH VOLTAGE POWER SCHOTTKY RECTIFIER)
please can any one help with this .
Analog Circuit Design :: 21.06.2006 18:37 :: bluecool :: Replies: 3 :: Views: 1522
I was just playing with the multisim and I thought of making a series circuit consisting of two capacitors just for nothing.
I must have 8V and 4V across capacitors, but MultiSim was showing 6.003V and 5.997V.
What could be wrong? I h
Electronic Elementary Questions :: 18.11.2012 02:11 :: ALERTLINKS :: Replies: 21 :: Views: 4273
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 13:29 :: Chris56000 :: Replies: 1 :: Views: 4012
garg29, the CCS design using lm2576 is overly complicated.
the two opamps act as an "error" amplifier and feed the error to the feedback pin of the lm2576.
fortunately, inside that feedback pin there is already an error amplifier.
the voltage drop at the feedback pin should be 1.35v (for the adj. version, and 3.3v/5v/12v/15v for their resp
Hobby Circuits and Small Projects Problems :: 04.07.2009 01:09 :: millwood :: Replies: 15 :: Views: 12258
Amplifier/power amp, power - 2x600 -700W with 8 Ohm, as cheap as it's possible
8 Ohm impedance need high voltage, so I need expensive high voltage condensers, that's why I choose bridge
Show DIY :: 07.12.2009 14:57 :: gres :: Replies: 0 :: Views: 978
If you use a regulator in your board then use 9 or 12v supply with 1A should be enough
---------- Post added at 23:07 ---------- Previous post was at 23:04 ----------
all your problem will solve if you get voltage at SIM card connections. can you check the connection
Digital communication :: 08.12.2010 15:07 :: ckshivaram :: Replies: 23 :: Views: 1426
I was looking at the following DIY power supply
Laurier's Handy Dandy Little Circuits: Supply Project.html and had a few questions.
I will be using a 24VDC 1.25A Wall Wart supply in to eliminate the transformer. This one uses 2 - 2000uf 50v capacitors. I was told by the author if I used anything e
Service Manuals, Requests, Repair Tips :: 24.12.2010 05:31 :: brosskgm :: Replies: 2 :: Views: 909
I have a Toshiba Laptop Computer. The battery charger output is 19vDC, 3.42 Amps, 65 watts. I ordered a dc to dc converter for use in my car. The specs of the converter that I received are 12vDC input, 15 to 17.5VDC, 6.5 Amps, 90 watts. Can I use this converter to charge my laptop even with the lower voltage? In other words is the input voltag
Electronic Elementary Questions :: 06.01.2011 20:03 :: Hawkeye57 :: Replies: 3 :: Views: 2681
Speakers from that far back usually ran on 6 or 9 Volts. I agree with Chuckey's method for determining the requirement for AC or DC and using the capacitor ratings to define an absolute maximum voltage. If you are able to open the case on the speaker that has the electronics in it (you would have had to in order to see the capacitors), the circuit
Electronic Elementary Questions :: 01.05.2011 23:26 :: KJ6EAD :: Replies: 7 :: Views: 313
4*12v battery (<= 56V at fully charged) +/- 2V. A 47R/5W resistor is connected with input terminal to drop down some voltages.
Analog Circuit Design :: 23.10.2011 11:02 :: Mithun_K_Das :: Replies: 16 :: Views: 966
Basically, I felt like making myself a little desk PSU.
I wish to design something that is capable of putting out probably 20A+ at a range of DC voltages, varying from 0-50V (From a 12vDC supply)
Only issue, is that I've never done anything with SMPSUs, so I don't really know where to start. I know there are ICs that are meant to control ever
Power Electronics :: 08.11.2011 15:09 :: RCAnderson :: Replies: 17 :: Views: 1162
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 :: 19.12.2011 01:06 :: Vermes :: Replies: 0 :: Views: 307
I have a vtower extreme vaporizer. It has a heating element on it and also a fan. The power supply on went out on it, and it costs 40 bucks to replace. When it first started going out it seemed like a loose connection, when I would wiggle the wire and push in the male/female end to the plug together it would eventually come back on. It is now compl
Power Electronics :: 19.04.2012 04:26 :: tooquick :: Replies: 6 :: Views: 324
What is the nominal & variance for ESR & Rja for your LED matrix? Also what duty cycle and/or PWM rate are you using?
I just installed LED's for a friend's outdoor garden stairs on 60 feet of handrail going to the lower back yard. I installed 13 flat PCA's with 6 x1W LEDs on each 1x6" Aluminum clad boards = matrrix of 78 = 6 x 13 luminai
Analog Circuit Design :: 16.06.2012 10:15 :: SunnySkyguy :: Replies: 62 :: Views: 2372
Solar panel Voltage 12v
Power rating 5W
So you can charge 5/12 = 416 mA
All the mobile batteries are around 3.6V
Use regulator circuits or use 7805 regulator and use a USB Mobile charger
With this panel, it takes much more time to charge a 42AH battery. i.e more than two days
Use more no. of panels to increase your charging current
Other Design :: 21.06.2012 18:13 :: lalgpt :: Replies: 6 :: Views: 1052
i recently acquired an intermittently working LEADER LDC 824 frequency counter in a deal that is hard to resist (reads from 10hz to 520mhz)
sometimes it works (reads frequency) after 20mins warmup, sometimes after an hour other times it wouldn't work even after 2hours warmup time. Also at times it works even when the set is cold then suddenly st
Service Manuals, Requests, Repair Tips :: 11.06.2012 09:32 :: duldog :: Replies: 14 :: Views: 854
thank you for all your replys!
the goal of our SMP is to produce a sort of power source for selected devices or equipment during power outage or in outdoor activities.
So, for our specs: we decided to have an output of 3.6V, 5V, 12v...with usb port, we have not yet decided if we should include inverter,
"best energy storage/ initial cost", por
Power Electronics :: 01.07.2012 11:50 :: jay silver :: Replies: 5 :: Views: 443
@SunnySkyguy Thank you.You substantially helped me :)
- - - Updated - - -
@tpetar thank you for the recommendation.
I know that the 5mA getting from my PV panel is an issue,
however it should fit along with mobile or wearable devices.
That was a factor for choosing a PV panel like this SANYO -
Power Electronics :: 27.07.2012 03:21 :: tpetar :: Replies: 33 :: Views: 721