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Thread: Bedini Comparator Cap Dump

  1. #131
    Your right Tom!....Stilll i always wandered how the cap is able to dump 70A/sec ...advanced book says that...and if we'r using the same power in/out and amps to charge the batt.then whats the advantage?pulsed amps?

  2. #132
    Junior Member gabiX87's Avatar
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    Angry

    Hi everyone,

    currently sourcing the parts for the 12V comparator circuit which RS_ posted (KRL RS revB, 08/12/14). I have a couple of questions guys. I have no formal electro background , just a self learner.

    There are a lot of information in specs sheets which I cant interpret , need some help.

    1. I have all the resistors but I have problem to find D3 1N5242 12V Zener .... can I use 12V/1,3W = BZX85C12; 1N4742A ?
    2. Also none of the supplier have exactly LM741 ,they do have with different specs. Will these do ? LM741CH/NOPB (1MHz; 3÷18VDC; TO99) or LM741H (1MHz; 10÷44VDC) or UA741 CN = LM741 CN (DIP8) (1 MHz ,Supply Voltage Min 5 V , Supply Voltage Max 40 V )

    3. Also there are variations of IRFP260 MOSFET ... I suspect the higher the A rating the better for cap dump. I have some 3x or 4x IRFP260MPBF (HEXFET; 200V; 50A; 300W) Will these do ?
    or I can order these AUIRFP2602 Transistor: N-MOSFET; unipolar; 24V; 380A; 380W; TO247AD

    4. The capacitors should all be electrolytic ? Do all caps have to have the same Voltage rating ?


    Thanks for help
    Gabriel

    WHY THERE IS NO STRIKE-THROUGH FORMATING/OPTION TO STRIKE TEXT BUT NOT REMOVE IT.
    Last edited by gabiX87; 08-27-2016 at 02:53 PM. Reason: updates

  3. #133
    Senior Member James McDonald's Avatar
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    Quote Originally Posted by gabiX87 View Post
    Hi everyone,

    currently sourcing the parts for the 12V comparator circuit which RS_ posted (KRL RS revB, 08/12/14). I have a couple of questions guys. I have no formal electro background , just a self learner.

    There are a lot of information in specs sheets which I cant interpret , need some help.

    1. I have all the resistors but I have problem to find D3 1N5242 12V Zener .... can I use 12V/1,3W = BZX85C12; 1N4742A ?
    2. Also none of the supplier have exactly LM741 ,they do have with different specs. Will these do ? LM741CH/NOPB (1MHz; 3÷18VDC; TO99) or LM741H (1MHz; 10÷44VDC) or UA741 CN = LM741 CN (DIP8) (1 MHz ,Supply Voltage Min 5 V , Supply Voltage Max 40 V )

    3. Also there are variations of IRFP260 MOSFET ... I suspect the higher the A rating the better for cap dump. I have some 3x or 4x IRFP260MPBF (HEXFET; 200V; 50A; 300W) Will these do ?
    or I can order these AUIRFP2602 Transistor: N-MOSFET; unipolar; 24V; 380A; 380W; TO247AD

    4. The capacitors should all be electrolytic ? Do all caps have to have the same Voltage rating ?

    Thanks for help
    Gabriel
    Hi Gabriel --

    For the 12 Volt Zener use the same part number with a "B" added on the end. 1N5242B.
    For the 741 I used the better rated one which has a 44 volt swing. Which means the max
    +/- voltage is 22 volts.
    For the FET's it really depends on how much current you capacitors are going to store before
    you let them dump. I used a part that was rated at 200 volts @ 130 Amps. The IRFP260MPBF
    will be fine if your capacitor total is not to big.
    It is best if all the capacitors are rated at the same voltage. I used four totaling 88,000 ufd.
    The voltage rating was 63 volts. See my completed board assembly running on AC house
    current. It also works off the back of the SG Machine.



    James McDonald

    Attached Images Attached Images

  4. #134
    Junior Member gabiX87's Avatar
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    RS_ has exceeded their stored private messages quota and cannot accept further messages until they clear some space.

    Jame McDonald
    thank you much for the pic. I redraw the SNAGs-002 diagram back to Altium Designer and my friend will help me with PCB design and milling.
    By the way do you have *.PcbDoc or *.SchDoc of yours ? Would help a lot ,I have issues with parts library in altium. The schematic is ok , but the PCB part ,oh boy...

    Thanks
    G
    Last edited by gabiX87; 08-23-2016 at 04:24 AM.

  5. #135
    gabiX87

    Deleted private messages.......

  6. #136
    Quote Originally Posted by RS_ View Post
    Attachment 3128

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

    hope this helps every one build them at 12V
    Hello RS
    Thanks for all that information and the 12V Circuit.
    I have 2 Questions please:
    I am not sure how the Opto is connected.
    Pin5 -> + charging
    Pin4 -> Base Q1
    Pin6 -> "nothing"
    Pin1 ??
    Pin2 ??

    second:
    Is there a different if i use my SSG with or without the cap dump on the charging battery? Charges faster or what does it do?

    Thanks so much.
    Thomas

  7. #137
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    Cap Dump Circuit for 36V system

    Hi RS,

    I'm late to the party but have been developing a solid state generator (attached) and am at the stage where I wish to compare the battery charging when feeding the HV pulses (attached) directly to the two 36V battery stacks to when some cap dump system is used. The HV scope traces were taken with a 45:1 voltage divider so the pulses are around 700V, although will be around 8,000V when I have switched to a different set of coils with high permeability cores.

    I was sent your circuit by another member but, as relatively new to some of these things, I wondered if you could ask some questions re the circuit (attached).

    1. I would like to be able to run the cap dump from the drive batteries and not some external power source so can I ignore the FWBR on the left and connect directly to my 12.7v supply rail?

    2. This circuit uses an optocoupler that I have heard said can impair the fast switching of the FET. Is this something you recognise or is it insignificant?

    3. Which components allow one to set the discharge voltage threshold (I assume the discharge rate will be a function of that and the cap value)

    4. Can one build in a simple means of indicating that the main cap is charged (LED?) and also of safely discharging it after the main generator is turned off?

    Thanking you

    Jules
    Attached Images Attached Images
    Last edited by JulesP; 01-30-2019 at 02:24 AM.

  8. #138
    Hi Jules,

    I am sorry that i have not seen your post any sooner....

    got a new puter before x-mas and just now logged back into this site

    The Cap Dump compairtor circuit is powered from the energy that is coming into the dump cap, no need to power it with the drive battery's

    I don't know why you would want to ignore the FWBR, and connect directly to the 12.7v supply rail, this would just fill the dump cap to 12.7V and never do any thing else.... The FWBR should be on the out put of your oscillator, to feed the spikes into the dump cap, to fill up the cap till the comparitor trips and dumps the cap, and then repeats....

    The H11D1 is what JB has always used. There are newer faster Opto's out there, and they can be used in place of the H11D1.

    R10 pot adjusts the voltage that the circuit discharges at....

    the discharge rate is a function of the amount of energy coming into the Dump cap, and the discharge rate will vary as the input energy vary's.
    Such as the primary discharges, etc....

    The comparitor's output could be fed to another Opto that can kill the trigger of your oscillator during the cap dump if needed

  9. #139
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    Hi RS,

    Thank you for your thoughts.

    Since writing that post I have had a chance to get to understand the circuit better and have drawn my own version of it (attached) that I find helpful as a preparation for a build and which incorporates my battery swapper and an LED off the LM741 to indicate activity. I now recognise that the timing control power supply is from the energy delivered to the main cap but even so, from the SG Intermediate handbook*, I read that the FWBR is not required as the HV pulses are unidirectional anyway and to save on voltage drop. That is why my circuit brings the HV feed straight to the 15,000 (or greater) cap.

    *"p30-31: The full-wave bridge requires the output pulse to travel through two diodes that each have a voltage drop of about .6 volts. . . . . .So, it seems clear that collecting the output pulse from the main coil winding (MC) and using a single diode (D2) to direct that impulse to the capacitor (C) is more efficient."

    With regard to the charge and discharge voltage levels that a cap dump system working with 36-38V batteries should be adjusted to, I understand that the upper threshold should be about 48V and the lower around 40V? I have displayed this in the attached graphic and wondered if you think those are reasonable.

    My battery charging experiments with the solid state generator indicate that as the frequency increases the charging benefit declines and is certainly not a liner function of frequency. I'm thinking that as the interval between succesive pulses gets shorter and shorter the battery is unable to fully 'process' them. I'm hoping that a cap dump circuit in between will be better able to absorb the hot and cold aspects of the HV pulses and relay them more effectively to the batteries and that increasing my cap to 60,000uF will be useful too.

    Regards,

    Jules
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