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12 volt DC Voltage Stabiliser circuit
Can anyone help me with obtaining a circuit diagram to build the above
please. Required for an LCD T/V. I live in the United Kingdom and the boat is on the Great Ouse near Huntingdon. Thankyou |
12 volt DC Voltage Stabiliser circuit
mack wrote:
Can anyone help me with obtaining a circuit diagram to build the above please. Required for an LCD T/V. I live in the United Kingdom and the boat is on the Great Ouse near Huntingdon. Thankyou You did not say how many amps you need or what supply you will give it. Try Maplin to start with http://www.maplin.co.uk/Search.aspx?...15m1&source=15 |
12 volt DC Voltage Stabiliser circuit
"Bozo" wrote in message ... mack wrote: Can anyone help me with obtaining a circuit diagram to build the above please. Required for an LCD T/V. I live in the United Kingdom and the boat is on the Great Ouse near Huntingdon. Thankyou You did not say how many amps you need or what supply you will give it. Try Maplin to start with http://www.maplin.co.uk/Search.aspx?...15m1&source=15 The boat supply is 12 volts DC - but when charging i.e engine running, this can rise to above 14 volts, this would no do an LCD T/V a lot of good. T/V takes less that 5 amps DC - hope this makes my request a bit clearer. I wish to build not buy. |
12 volt DC Voltage Stabiliser circuit
Actually a 60 watt load is a lot for a non switching regulator to do.
You don't want a switching type on a boat as it interferers with the radios. I think your best bet is : http://www.nteinc.com/specs/900to999/pdf/nte933.pdf I have used this in airplanes with good luck before. NOTE! USE a BIG heat sink!! it will get hot. If it gets too hot the device will auto shutdown. Captain Joe On 15-Jan-2007, "mack" wrote: The boat supply is 12 volts DC - but when charging i.e engine running, this can rise to above 14 volts, this would no do an LCD T/V a lot of good. T/V takes less that 5 amps DC - hope this makes my request a bit clearer. I wish to build not buy. |
12 volt DC Voltage Stabiliser circuit
Peter,
I don't think that will be a problem for the display, most of them will handle a low voltage condition without a problem but a switching type will interfere with the radios. Plus it is beyond a first time do it yourself project. Captain Joe On 15-Jan-2007, Peter Bennett wrote: Actually a 60 watt load is a lot for a non switching regulator to do. You don't want a switching type on a boat as it interferers with the radios. I think your best bet is : http://www.nteinc.com/specs/900to999/pdf/nte933.pdf I have used this in airplanes with good luck before. NOTE! USE a BIG heat sink!! it will get hot. If it gets too hot the device will auto shutdown. Captain Joe The NTE933 is not a good choice for this application - the minimum input/output differential (AKA dropout voltage) is 2.6 volts - on a car or boat 12 volt system, this means that the NTE 993 regulator will only be working as a voltage dropper, and not as a regulator. I think that the only solution for the OP is a switching regulator that can both buck and boost the input voltage. -- Peter Bennett, VE7CEI peterbb4 (at) interchange.ubc.ca new newsgroup users info : http://vancouver-webpages.com/nnq GPS and NMEA info: http://vancouver-webpages.com/peter Vancouver Power Squadron: http://vancouver.powersquadron.ca |
12 volt DC Voltage Stabiliser circuit
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12 volt DC Voltage Stabiliser circuit
"mack" wrote in
: The boat supply is 12 volts DC - but when charging i.e engine running, this can rise to above 14 volts, this would no do an LCD T/V a lot of good. T/V takes less that 5 amps DC - hope this makes my request a bit clearer. I wish to build not buy. Makes no difference, whatsoever, unless some idiot switches the battery switch to OFF with the CHARGER OR ENGINE RUNNING! The 12V input to ANY LCD TV or other electronic device made in the last 30 years is a voltage regulator or DC to DC converter that converts whatever crap you feed it to what the TV needs, regulated to rock stable voltage no matter what the input does from 10-20 volts, easy. This oh-we-gotta-have-a-rock-steady-power-source nonsense comes from the Rock-Steady Power Supply Company, LLC., who's gotta sell this crap to stay in business. The worst stupidity is small computers, who have switching power supplies that really don't care what you feed them, as long as it's over about 80VAC. The computer, first, rectifies whatever AC, pulses, spikes, buzzes, sparks, even DC fed to it and charges a few filter caps in parallel to whatever HVDC it can get, then feeds the DC to a highly regulated DC-DC switching regulator that turns that into highly filtered, perfect DC that varies not over a huge range of input garbage and load current. (I don't care if my UPS is a square wave, as long as it runs to keep that input coming when the power company fails.) Lionheart has a massive LCD TV made by some unknown, no-name Korean manufacturer running straight off the house battery panel. I'm sucking DC from the starboard DC lighting circuitry, which just happened to have wires hanging out where we took the light down and put the TV on a swing arm mount so we can use it for a big video monitor for The Cap'n off the laptop. It has worked fine for many years....(c; The dock has cable! Still not convinced? Plug the wall brick into any AC outlet and measure the 12VDC output of it. What? You say it's over 16V open circuit! WOW! Larry -- Extremely intelligent life exists that is so smart they never called Earth. |
12 volt DC Voltage Stabiliser circuit
"Larry" wrote in message
... "mack" wrote in : Makes no difference, whatsoever, unless some idiot switches the battery switch to OFF with the CHARGER OR ENGINE RUNNING! The 12V input to ANY LCD TV or other electronic device made in the last 30 years is a voltage regulator or DC to DC converter that converts whatever crap you feed it to what the TV needs, regulated to rock stable voltage no matter what the input does from 10-20 volts, easy. rest of rant snipped Larry, this is over-generalized. I have first hand experience with expensive touchscreen LCD's from Xenex. These were 24V screens and a 90-240V adapter was supplied. 12 were installed in a 96' motor yacht and they all fried (backlight) within 6 weeks. Turns out they could not stand 28.8V of a fully charged battery bank, so we installed 24/24V DC/DC converters. Meindert |
12 volt DC Voltage Stabiliser circuit
"Peter Bennett" wrote in message news.com... On Tue, 16 Jan 2007 00:53:10 GMT, wrote: Actually a 60 watt load is a lot for a non switching regulator to do. You don't want a switching type on a boat as it interferers with the radios. I think your best bet is : http://www.nteinc.com/specs/900to999/pdf/nte933.pdf I have used this in airplanes with good luck before. NOTE! USE a BIG heat sink!! it will get hot. If it gets too hot the device will auto shutdown. Captain Joe The NTE933 is not a good choice for this application - the minimum input/output differential (AKA dropout voltage) is 2.6 volts - on a car or boat 12 volt system, this means that the NTE 993 regulator will only be working as a voltage dropper, and not as a regulator. I think that the only solution for the OP is a switching regulator that can both buck and boost the input voltage. A while back there was some discussion regarding the decrease in life of LED lights if you ran them on the charging voltage of 14 volts vs a lower voltage. Voltage reduction solutions were discussed. The potential problem with the lack of sufficient voltage differential to properly activate a voltage regulator was discussed and a couple of folks pointed out there are low-dropout regulators that will work with a differential of only 0.4 volts. Don't know about the power handling ability of these though. |
12 volt DC Voltage Stabiliser circuit
"Meindert Sprang" wrote in
: I have first hand experience with expensive touchscreen LCD's from Xenex. These were 24V screens and a 90-240V adapter was supplied. 12 were installed in a 96' motor yacht and they all fried (backlight) within 6 weeks. Turns out they could not stand 28.8V of a fully charged battery bank, so we installed 24/24V DC/DC converters. Meindert Wow, what a piece of crap that thing was! Why didn't we take back the DEFECTIVE PRODUCTS? Was the regulator in the wall adapter?? That's just plain stupid, right there! Larry -- Extremely intelligent life exists that is so smart they never called Earth. |
12 volt DC Voltage Stabiliser circuit
I would like to thank everyone for their help and comments.
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12 volt DC Voltage Stabiliser circuit
If you can locate an HP F1064A it might do the trick. These are DC to
DC converters designed for older HP laptops that had a 12v input to be ran off of a car battery. They supply around 60watts I think and provided a regulated 12v out. Getting a steady 12v out when the input is lower and sometimes higher then the output is a more difficult job for DC to DC converts. These old HP units handle it well. Have seen them on Ebay every once and a while for around $20. (One is there now listed for over $100, and incorrectly calling it an AC adapter.) I am using one for to drive my LCD panel. And FWIW, when I measured the output on the LCDs supplied AC adapter, it was 12.4v no load, down to 12.2v under load..... -al- |
12 volt DC Voltage Stabiliser circuit
Al Thomason wrote:
If you can locate an HP F1064A it might do the trick. These are DC to DC converters designed for older HP laptops that had a 12v input to be ran off of a car battery. They supply around 60watts I think and provided a regulated 12v out. Getting a steady 12v out when the input is lower and sometimes higher then the output is a more difficult job for DC to DC converts. These old HP units handle it well. Have seen them on Ebay every once and a while for around $20. (One is there now listed for over $100, and incorrectly calling it an AC adapter.) I am using one for to drive my LCD panel. And FWIW, when I measured the output on the LCDs supplied AC adapter, it was 12.4v no load, down to 12.2v under load..... Good find Al. I searched the descriptions too for F1064A and there are a few of those at more reasonable prices ($40 shipped) in one of the eBay stores: http://tinyurl.com/2u5bwx The specs listed there a INPUT: 9V - 24V DC, 8.5A MAX OUTPUT: 12V DC 40W, negative-tip Jack -- Jack Erbes in Ellsworth, Maine, USA (jackerbes at adelphia dot net) (also receiving email at jacker at midmaine dot com) |
12 volt DC Voltage Stabiliser circuit
"Al Thomason" wrote in message ... If you can locate an HP F1064A it might do the trick. These are DC to DC converters designed for older HP laptops that had a 12v input to be ran off of a car battery. They supply around 60watts I think and provided a regulated 12v out. Getting a steady 12v out when the input is lower and sometimes higher then the output is a more difficult job for DC to DC converts. These old HP units handle it well. Have seen them on Ebay every once and a while for around $20. (One is there now listed for over $100, and incorrectly calling it an AC adapter.) I am using one for to drive my LCD panel. And FWIW, when I measured the output on the LCDs supplied AC adapter, it was 12.4v no load, down to 12.2v under load..... -al- AL Thanks for pointing this out. Looks like it could be one solution to providing a steady 12 volts to those very expensive masthead LED lights. Think I'll get one before the supply dries up g. |
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