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Thread: Yum! Tank Circuits!

  1. #11
    FLAC
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    Quote Originally Posted by Curiosity
    Sure, with normal diodes it picks the path of least resistance, but these are a little different. The more current the more resistance, so one definitely can't dominate. I've never seen a diode that works like this before.
    Correct - if you aren't pushing the limit of current flow. So for e.g. 10 2A diodes to pass 5A with a lower than normal forward voltage drop due to the sharing is fine. Trying to pass 20A is not - some of the diodes would take more than their fair share of current and be outside of spec as a result. Somewhere between 5 and 20A is the point where your are pushing an individual diode beyond it's specs and that point is impossible to predict since it depends on the particular set of diodes you test it with due to normal variations in performace. I'm taking advantage of that to have 13 2A 12V regulators in parallel to provide only 8A - so I'm at less than a 1/3 capacity but my circuit could not provide the full 26A - one by one the most efficient regulators would blow until all were gone. Probably start a fire too...

    The diode you've found is pretty similar to the schottky ones I'm using - a bit better looking at the spec sheet. Nice find.
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  2. #12
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    Quote Originally Posted by zootjeff
    A better solution would be to put the resistor in parallel with the diode.
    Care to explain alittle bit more in details? You meant the classic tank but with a resistor in parallel added to the diode?

  3. #13
    Newbie kmccann's Avatar
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    Thumbs up isolator

    hmm...battery isolator sounds like a good solution to my predicament. i did not know such a thing existed, so thanks for the tip...i will do some research on them. the cost isnt that bad if you look around on ebay. are there any issues other than cost that prevent more people from using them? it sounds like a much better solution than these tank circuits. no one seems to have them completely figured out and there seems to be a lot of uncertainty surrounding them (thats the impression i get from reading all these posts). thanks again!


  4. #14
    Newbie kmccann's Avatar
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    on the topic of choosing an isolator... if my car's alternator is 14V/120A and i use two 12V/100Ah batteries, can i use a 200A isolator? are they rated along the lines of "up to"? it seems to me that this is the case, but i havent found anything that clearly said it to be so.

  5. #15
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    Quote Originally Posted by kmccann
    no one seems to have them completely figured out and there seems to be a lot of uncertainty surrounding them (thats the impression i get from reading all these posts). thanks again!

    Thats because whenever a circuit is posted, theres always someone out there who will suggest/critizise the design. BUT they never really post their own so called ideal design.

    How many times have you seen, yeah you should do this, do it that way, its better the other way and yet theres nothing put on paper. Too much talk and no action in my opinion. Just remember its so easy to find a fault on someones idea.

    Even when someone worked out a better idea based on a circuit posted by someone, the new idea never get posted thats supposed to have worked...it just get kept somewhere.

    Come on guys, show us your ideas.


    END_OF_RANT

  6. #16
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    Yeah i'd like to see the best isolator diagrams.

  7. #17
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    Afraid to show it cause they questions their own design.


  8. #18
    Variable Bitrate numbers's Avatar
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    This sounds like a job for an FAQ. Is there no tank circuit FAQ around here?

  9. #19
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    Quote Originally Posted by ghettocruzer View Post
    I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
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  10. #20
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    Quote Originally Posted by Curiosity
    Jwith 2 full size I think it's better to use a battery isolator (expensive) because they both could require quite a bit of current to charge. Plus the isolator would let you run the PC without draining both batts which would make that full size 2nd batt useful.
    Check on ebay, i bought the stinger sr80 and it works great exactly for this purpose and after shipping was only around 20bucks.
    Link to one on ebay it was super easy to install. and a whole lot easier that trying to solder stuff together-diodes, resistors, capacitors , oh my!
    hasta,
    Yankee4x4

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