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Thread: Help with my tank circuit.

  1. #1
    ddt
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    Help with my tank circuit.

    I built a tank circuit using this diagram:



    I actually used (2) 2200MFD 50V caps wired in paralell.

    I used an MBR3045 and went and hooked it up.

    The computer wouldn't boot so I broke out the multimeter and while it was getting over 12V coming in it was only registering 3.18V going out (and into the PSU). So I decided to hook up a 1/2W resistor to it and charge the caps.

    Well they get to about 10.5V and then go back down to 3 or so volts. And do so repeatedly. What's going on here? Help me!

  2. #2
    Newbie
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    The diode is reversed? (Your diagram is right, BTW.)

  3. #3
    ddt
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    Well it was a short and I fixed it. After that my computer powered up beautifully and then for the test...

    I started the engine... and the computer rebooted . What now?

  4. #4
    ddt
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    Originally posted by RobM
    The diode is reversed? (Your diagram is right, BTW.)
    What do you mean? How could it be reversed? A and A go to the battery and K goes to the cap(s), right?

  5. #5
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    Originally posted by ddt
    What do you mean? How could it be reversed? A and A go to the battery and K goes to the cap(s), right?
    Nope, your diode it connected right. You could try a few things. Replace the CAP with a small gel cell 12 volt battery, or replace the CAP with a 1 farad cap. Or, replace the Diode with one with less forward voltage drop.

    Hey, where did you get that diagram?

    -Jeff
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  6. #6
    ddt
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    Originally posted by zootjeff

    Hey, where did you get that diagram?

    -Jeff
    Here:

    Tank circuit

    but you probably already know that now.

    Also, I just remove the caps and replace them with a small 12V gel cell wired the same way?

    Also, you made mention of other diodes. I'm using a 250W Top Micro DC-DC Converter. Which diode would you reccomend?

    I'm trying to get away from using a big assed cap due to space where I need to mount it. Would a .5 Farad cap work?

  7. #7
    ddt
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    On this page:

    http://www.batterystuff.com/battery/batteries.htm

    Would the ES 1.2-12 or the ES 1.9-12 be ideal for this?

    Or what about this one?

    http://cgi.ebay.com/ws/eBayISAPI.dll...&category=1200

  8. #8
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    Originally posted by ddt
    On this page:

    http://www.batterystuff.com/battery/batteries.htm

    Would the ES 1.2-12 or the ES 1.9-12 be ideal for this?

    Or what about this one?

    http://cgi.ebay.com/ws/eBayISAPI.dll...&category=1200
    Yes, just replace the Cap by the battery. I would go with the 4-12 but there is a chance the smaller ones would work..
    MPEGBOX - Plexiglass Computer
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  9. #9
    ddt
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    So I keep the diode? Is it really necessary with the 4-12 (which I just bought)?

  10. #10
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    Originally posted by ddt
    So I keep the diode? Is it really necessary with the 4-12 (which I just bought)?
    Yes you keep the diode. It is still important. Car cranking could still bring down the voltage at your spare battery if you don't have the diode.
    MPEGBOX - Plexiglass Computer
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