nugab Posted August 18, 2011 Report Share Posted August 18, 2011 Hey all, Nathan here. I'm new to this board, and looking for some tips.I'm new to electronics.I am making a portable video streamer. It's ghetto, and there are a slew of easier ways to meet my goals, but these are the parts I have available, and so I want to try and find a way to make it work.I have an Anton Bauer battery that is typically 16vdc, but can fluctuate 12v-17v. It's an 8 amp source.I'm trying to power a 12v encoder, that may require up to 2.5 amps.I have several small 12v solid voltage regulators from radio shack (I don't hace access to the P/N right now), at first they seemed perfect. But they can only supply up to 1 amp.I know so little that finding the right part is becoming more and more frustrating. After this project I plan to spend a good amount of time getting up to speed, possibly taking some electronics classes. I would love to finish this first though.I considered 3 of the Radio Shack regulators I have in series. From my online research it seems likely that I could reach my target of 12v, with enough current to supply 3 amps. But I'm not confident enough to test it out on my only encoder.I went to a store in town and got the closest thing I could identify as a possible solution. A nte970 Linear Integrated Circuit 3-Terminal Adjustable Positive Voltage Regulator.What a name!There are some inherent flaws with this part. Firstly, apparently my knowledge is far too lacking to know what to do with it.Secondly, it's called a "3-terminal regulator", but it only has 2 terminals to my eyes.I'd love some help. I don't mind buying a regulator or some various other part. I just want this to work.Sorry for the long post for such a simple problem. I'm prone to long-windedness.Thanks for your time.-Nathan Quote Link to comment Share on other sites More sharing options...
Hero999 Posted August 18, 2011 Report Share Posted August 18, 2011 Why were you even considering putting three regulators in series?The output current would remain the same but the drop-out voltage would triple.Assuming the encoder will be damaged by 17V (it might be able to work of that voltage fine) you need a low drop-out regulator, otherwise the battey life will be poor.I've found the datasheet for the nte970 and it doesn't sat what the drop-out voltage is but it's characteristics specified with the output voltage 3V below the input so it's probably similar to the LM317: about 2.5V. This means that when your battery voltage drops to 12V, the output voltage will be 10.5V.http://www.nteinc.com/specs/900to999/pdf/nte970.pdfA more detailed explanation of what the drop-out voltage is can be found in the thread linked below:http://www.electronics-lab.com/forum/index.php?topic=24319.msg100192#msg100192 Quote Link to comment Share on other sites More sharing options...
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