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Thread: Bedini Comparator Cap Dump

  1. #21
    Thanks for clearing that up Ron,i read a couple of threads about the comp.circuit and that i understood.I build the 555 timer with opto and 2 transistors,swiching the negative side,tried all kinds of caps and voltage levels,but the charging is very slooow compared to the coil wich charges very fast...Did you tried the comparator?it does somthing else,than the 555 setup does?cheers

  2. #22
    Adys15,
    I've tried both kinds of circuits. Definitely build the comparator circuit. Its much better for cap dumping than the 555 timer setup.

    Ron

  3. #23
    Senior Member John_Koorn's Avatar
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    Adys15,

    The function of both the comparator and the 555 based circuits are basically the same - fill and spill. However the main differences are:
    1. The comparator spills based on the voltage of the capacitor, the 555 spills based on a fixed amount of time.
    2. The comparator uses FETs to switch the spill, the 555 (as depicted in the FEG book) uses BJTs to switch the spill.

    Think how these differences could make the comparator a better cap dump circuit than the 555 setup.

    John K.

  4. #24
    Thanks for info guys.Jon if i measure the voltage across the cap i can set the dump freq,to discharge at any voltage level,i want.

  5. #25
    Senior Member John_Koorn's Avatar
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    adys15, are you talking about the 555 circuit? You mean by adjusting the 555 timer you can set the dump voltage?

    If so, that is true. But that also means that as the battery voltage rises so does the dump voltage. With the comparator, as the battery voltage rises the dump frequency gets quicker as it is always dumping the cap at the same voltage.

    John K.

  6. #26
    Yes John i was talking about the 555 circuit.You are right about the dump freq,interesting...Today i built a trifiliar version with bridge rectif. and the same 555 circuit,but the charge time is still very slow compared to coil spikes,when i hook the coil directly the voltage takes of like secounds,and cold boils the batery in half hour(7Ah batt),and i cannot alow more curent into the transistor base because the power coil is unused and without a load batery on it the transistor get hot if i pump more curent.The skematic is just like in the FEG book,except i use a transistor instead of scr.

  7. #27
    SNAGs-002.jpg

    Here is a 12V version of Bedini's Comparator Trigger Cap Pulser......

    hope this helps every one build them at 12V

  8. #28
    Quote Originally Posted by RS_ View Post
    SNAGs-002.jpg

    Here is a 12V version of Bedini's Comparator Trigger Cap Pulser......

    hope this helps every one build them at 12V
    THANK YOU..been playing with this for while,ended up burn my transistor...this should help MUCH..
    Cheers,
    Alfin

  9. #29
    Thanks again for skematic RS.

  10. #30
    Senior Member Ed_Morbus's Avatar
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    RS_ thanks for schematic

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