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  • The inventor of our preferred circuit 555 timer died this year 8.8.2012 - 78 years old.


    For those being able to read German: Here a excellent compendium of all 555 types.
    Experts spend hours a day in order to question their doing while others stopped thinking feeling they were professionals.

    Comment


    • Commercially available driver
      A good commercial driver but limited to about 500Khz
      some basic Annotations for driving FETs
      JohnS
      Experts spend hours a day in order to question their doing while others stopped thinking feeling they were professionals.

      Comment


      • Fas FET switching

        JohnS,

        This is great. We've got a whole forum to ourselve. Just kidding, this much better than posting on the motor forum. Thank you.

        Your information and illustrations were very clear, thank you. It looks like what I want to try is very possible. Now, if I don't use an extremely high frequency, say 100-200kHz, will the 555the allow me to turn the duty cycle down to where the ON time is less than 1a micro second? BTW, how is the ON time designated on a data sheet for a FET? What is it called?

        So far I am planning on making a bi-filar coil of two 22AWG wires and placing one of them across the battery terminals, swithing it with a FET, fast enough to prevent the ions (not electrons) in the battery from moving in the discharge direction. The other wire will go to the A/C side of a full wave bridge rectifier and, hopefully, I will get something out od the DC side (DC or radiant). As long as the ions don't move in the discharge direction the battery stays charged. Free energy. We'll see.

        I want to do this experiment on a 12v battery and I hope 0 amps will be coming out of it into the FET. According to Tom, if we switch OFF within a micro second, then no current flows, just potential.

        I looked at and copied the material on the links you provided. I will read all of it. Digi-Key has LT8610s for $4.36-8.34 each. Not cheap, but if this is better than a 555...oh, well.

        Thanks again, cheers,

        Bob
        Originally posted by JohnStone View Post
        Commercially available driver
        A good commercial driver but limited to about 500Khz
        some basic Annotations for driving FETs
        JohnS

        Comment


        • ready made work:
          They used a RF FET 1.4 Ohm but we need not supply much current but a voltage shock! This circuit can pulse up to 1200V and down to 20ns pulse width. 40A single pulses!

          EDIT: Just detected the driver is obsolete and therefore you find excessive prices only. But IXYS offer a full bunch of different drivers and pulse modules. So the RF rail is the way to go. i.e. example
          Last edited by JohnStone; 10-22-2012, 03:24 PM.
          Experts spend hours a day in order to question their doing while others stopped thinking feeling they were professionals.

          Comment


          • Hi Bob,
            why do you choose a switched regulator for pulse generation?
            One step is generating a frequency for pulse repetition. This can be done by a LMC555 easily. Do not care for duty cycle there.
            For pulse width you do not need to sweep a big range - so you have good options to choose:
            1. For this we find simple circuits. i.e. Zero Crossing Detectors second pic.
            2. Another approach can be to start two Monoflops (74HC123) at same trigger time by your oscillator. The monoflops have slightly different timing. By fine tuning you can generate extremely short pulses with much slower circuits.
            see http://www.edn.com/file/21978-51100di.pdf article Scroll to article "Simple circuit produces a less-than-25-nsec pulse"
            Last edited by JohnStone; 10-22-2012, 07:12 PM.
            Experts spend hours a day in order to question their doing while others stopped thinking feeling they were professionals.

            Comment


            • Choosing a circuit

              JohnS,

              I am completely open to any suggestion you have as to what circuit to use. I lean toward simplicity whenever possible, I only want to get good 1us (or less) switching. I thought the Frequency Generator that you gave was "the thing" for this, but as you explained it is not.

              The frequency can be anything that helps get the 1us. Having some time in between ON times will allow the ions to lose any momentum that the switching may cause in them. I would guess that anything between 25kHz and 250kHz would suffice.

              Looking at the circuits you linked to I see the 74HC86 circuit is the 2nd pic. Is that the one you were suggesting that I look at? This circuit would run over 100kHz and the delays seemed to all be in the 11ns to 50ns range. Would this circuit allow an ON/OFF time of 1us or less?

              If this circuit will work well for me, will I need the following Comparator circuit with it to make sharp signals? Are there other sections that I will need to add on in order to run the FET?

              Also, somewhere in all that I remember something about sending a neg signal to shut off the FET quickly or sharply. Is that a consideration?

              The "Low cost 2GHz" circuit was strictly between 2.3 and 2.5GHz. That seems excessive at this point and I'm not sure if the ions would see that more as a constant ON. (?) Might be something to try later. (?)

              I hope that I don't wear you out with my ignorance of electronics. I am going to find some kind of an electronics glossary. If I get the terminology down I will be able to put things in context. I'm very good with systems...once I get the facts.

              Thanks again, buddy,

              Bob

              Originally posted by JohnStone View Post
              Hi Bob,
              why do you choose a switched regulator for pulse generation?
              One step is generating a frequency for pulse repetition. This can be done by a LMC555 easily. Do not care for duty cycle there.
              For pulse width you do not need to sweep a big range - so you have good options to choose:
              1. For this we find simple circuits. i.e. Zero Crossing Detectors second pic.
              2. Another approach can be to start two Monoflops (74HC123) at same trigger time by your oscillator. The monoflops have slightly different timing. By fine tuning you can generate extremely short pulses with much slower circuits.
              see http://www.edn.com/file/21978-51100di.pdf article Scroll to article "Simple circuit produces a less-than-25-nsec pulse"

              Comment


              • Hi Bob,
                you are welcome to ask any question.
                I try to give a bit of overview in order to help you to adjust and know precisely what you need. I know this is confusing sometimes but it is better than suggesting one single possibility without any learning effect at your side. You learn here more than your feeling tells you - believe it!.

                1. The generator I suggested is a quality circuit and it is suitable up to 1 MHz (with some drawbacks). The duty cycle adjustment within that generator is not suitable for your application because it will end far from the pulsewidth you focus on. So please understand that your application begins somewhere where UFOs initial teaching ended. It was intedend to educate basic pulsing of coils. Therefore you get some additional suggestions from me

                2.
                All driving circutis I suggeted focus an quite normal FET driving. What I detected yesterday is that the current technology in FR FETs is far advanced compared to my knowledge before. Therefore I posted that pulsing doc for food application.

                4.
                So look at the folowing buildiung blocks:

                A: My generator including duty cycle. It is easy to test and can be used for whatever you want - general purpose.

                B: "Simple circuit produces a less-than-25-nsec pulse" .... you generate very narrow pulses far from what any normal generator can do. This is YOUR special add on to the generator. This is the signal only - no driver capability requested here. And it is dead simple. But please

                C: IXYS driver 20amps. Dedicated and near to the RF FET. Low power input. Good separation from all generator action. The driver satisfies all requirements for the FET. Please do not believe this circuit is beyound your needs. In practical use you will have drawbacks and possibly not get 20ns pulses. But it is good to have pulses as narrow as possible because you do not want to operate at lower limits where you possibly can just see some dim OU effects.
                And prepare to apply SHORT / HEAVY wires

                D: IXYS RF FET - your valve to OU
                Prepare for cooling your FET. And prepare to apply SHORT / HEAVY wires

                E: HV PSU
                As you possibly detected that pulsing circuit is being driven by a 9V battery block and HV generator added. The pulses kick with excessive amps but for short time (kick with a hammer) and low repetition rate.
                For first trials it is suitable to start with 12V but do not expect miracles. The OU effects increase excessively with pulses being narrow and high voltage. It is essential to hit the ether with a small hammer with excessicve speed (voltage)
                So you will shurely come to require HV pulses. For beginning try to use a CFL electronics or a HV PSU from a CCFL tube from a flat screen. They generate pulses of about 1 KV and you easily can rectify them (HV diode) and store them in a HV cap ready for use. Or you use an old flashlight. The generate about 400V at flash tube (this voltage can be lethal !!!!!)

                The suggestions above would be my trail to narrow pulses and in fact you led me to think these thoughts now so I myself can prepare to do the same. Thanks for your kick
                JohnS
                Experts spend hours a day in order to question their doing while others stopped thinking feeling they were professionals.

                Comment


                • Nature of square waves

                  Tha basic wave form of any oscillation is the sine wave. This is the natural property of oscillations.
                  But we know that there are lots of other waveforms in use. In order to understand and calculate those forms and to preemt their effect it is usual to decompose them into a bunch of sine waves of different frequency and amplitude. And of course the effects and the processing of sine wevaes is well known.
                  The mathematician Fourier demonstarted this decomposition first time and therefore its name is "Fourier Transformation / Analysis".
                  Conversely we can synthesize any wave by summing up a bunch of well tuned sine frequencies.
                  We will focus here on square waves.
                  It easily understandable that a square wave of 50% duty cycle conatains a basic sine wave fitting exactly inside the square wave. The question is what additional waves are necessary in order to fill up the missing areas.
                  Notion in advance: The additions will be higher frequencies and they will have less amplitude.
                  Please study the Figure 1-4.2 Spectra of some commonly occurring waveforms (here).
                  The graphs show that a square wave contains additional frequencies with odd factors 3f, 5f .......
                  The more components we add the more we can generate sharp vertices.

                  The notions above relate to a square wave with 50% duty cycle. The conditions change dramatically if we generate narrow pulses. see
                  Experts spend hours a day in order to question their doing while others stopped thinking feeling they were professionals.

                  Comment


                  • 1st step

                    OK JohnS,

                    I'm at work, so I can't go into detail on what I understand from your last post. I'll get that out later today, but t looks great so far.

                    Let me clarify one thing though. What I am trying to do with this particular experiment is not to get spikes. I know that sounds like blasphemy, but this other is intriguing. The switching is only providing gating for the voltage coming out of the battery such that the ions don't move (only the charges). The voltage will come out normally, just 12v (24, 36, 48...), but it will be "free".

                    "I'll be back,"

                    Bob


                    Originally posted by JohnStone View Post
                    Hi Bob,
                    you are welcome to ask any question.
                    I try to give a bit of overview in order to help you to adjust and know precisely what you need. I know this is confusing sometimes but it is better than suggesting one single possibility without any learning effect at your side. You learn here more than your feeling tells you - believe it!.

                    1. The generator I suggested is a quality circuit and it is suitable up to 1 MHz (with some drawbacks). The duty cycle adjustment within that generator is not suitable for your application because it will end far from the pulsewidth you focus on. So please understand that your application begins somewhere where UFOs initial teaching ended. It was intedend to educate basic pulsing of coils. Therefore you get some additional suggestions from me

                    2.
                    All driving circutis I suggeted focus an quite normal FET driving. What I detected yesterday is that the current technology in FR FETs is far advanced compared to my knowledge before. Therefore I posted that pulsing doc for food application.

                    4.
                    So look at the folowing buildiung blocks:

                    A: My generator including duty cycle. It is easy to test and can be used for whatever you want - general purpose.

                    B: "Simple circuit produces a less-than-25-nsec pulse" .... you generate very narrow pulses far from what any normal generator can do. This is YOUR special add on to the generator. This is the signal only - no driver capability requested here. And it is dead simple. But please

                    C: IXYS driver 20amps. Dedicated and near to the RF FET. Low power input. Good separation from all generator action. The driver satisfies all requirements for the FET. Please do not believe this circuit is beyound your needs. In practical use you will have drawbacks and possibly not get 20ns pulses. But it is good to have pulses as narrow as possible because you do not want to operate at lower limits where you possibly can just see some dim OU effects.
                    And prepare to apply SHORT / HEAVY wires

                    D: IXYS RF FET - your valve to OU
                    Prepare for cooling your FET. And prepare to apply SHORT / HEAVY wires

                    E: HV PSU
                    As you possibly detected that pulsing circuit is being driven by a 9V battery block and HV generator added. The pulses kick with excessive amps but for short time (kick with a hammer) and low repetition rate.
                    For first trials it is suitable to start with 12V but do not expect miracles. The OU effects increase excessively with pulses being narrow and high voltage. It is essential to hit the ether with a small hammer with excessicve speed (voltage)
                    So you will shurely come to require HV pulses. For beginning try to use a CFL electronics or a HV PSU from a CCFL tube from a flat screen. They generate pulses of about 1 KV and you easily can rectify them (HV diode) and store them in a HV cap ready for use. Or you use an old flashlight. The generate about 400V at flash tube (this voltage can be lethal !!!!!)

                    The suggestions above would be my trail to narrow pulses and in fact you led me to think these thoughts now so I myself can prepare to do the same. Thanks for your kick
                    JohnS

                    Comment


                    • Summary

                      JohnS,

                      Yes, this sounds so good. These in series:

                      A- Your frequency generator

                      B- 25ns add-on ("Simple circuit...25ns pulse")

                      C- IXYS Driver 20A

                      D- IXYS RF FET

                      I assume this next one feeds just the RF FET:

                      E- HV PSU

                      I will look into the RF FET. I'm unfamiliar with it. I'm still wondering, if this works as I hope and no amp draw/only potential, will the FET heat up at all? I will provide a heatsink anyways.

                      Am I right that the HV PSU is to supply the FET only?

                      I already have the components for building your frequency generator ordered. The rest won't be much. I hope to get this thing off the ground soon. Cool!

                      Thanks,

                      Bob

                      Originally posted by [email protected] View Post
                      OK JohnS,

                      I'm at work, so I can't go into detail on what I understand from your last post. I'll get that out later today, but t looks great so far.

                      Let me clarify one thing though. What I am trying to do with this particular experiment is not to get spikes. I know that sounds like blasphemy, but this other is intriguing. The switching is only providing gating for the voltage coming out of the battery such that the ions don't move (only the charges). The voltage will come out normally, just 12v (24, 36, 48...), but it will be "free".

                      "I'll be back,"

                      Bob

                      Comment


                      • JohnS,

                        I looked at the IXYS stuff. Is the IXZR16N60 (600V, 18A, 350W) or IXZR08N120 (1200V, 8A, 250W) what you had in mind? This must be state-of-the-art stuff.

                        Comment


                        • JohnS,

                          I just looked at the RF FET driver, DEIC515 (8-25V, 15A max.,45MHz, ins rise and fall times, 8ns pulse width!) and for only $46.13! Pricy, but it might allow us to do some things that we haven't imagined yet.

                          This seems like a little overkill, but if you think that it is the way to go, then I'm OK with it.

                          Bob

                          Comment


                          • JohnS,

                            That was supposed to be a "4ns" rise and fall times, but my computer changed it to "ins" and I didn't catch it in time.

                            Let me know what you think and I'll order things accordingly.

                            Having this capability this close now is unbelievable.

                            Bob

                            Comment


                            • one casing but expensive as well. Those are top level solutions we can convert to when time has come.
                              Microsemi: http://www2.microsemi.com/datasheets/drf1200_a.pdf
                              Last edited by JohnStone; 10-24-2012, 02:38 PM.
                              Experts spend hours a day in order to question their doing while others stopped thinking feeling they were professionals.

                              Comment


                              • Hi Bob,
                                regarding your batteries:
                                • You obviously need to have more voltage at primary batteries i.e. 36V - three in series.
                                • You want to pulse voltage but no amperage into the secondaries i.e. three 12V in parallel.
                                • Use short heavy leads.
                                • Your generator, driver, FET neet to be completely earth free. Check it!
                                • Your battery system needs to be completely earth free.
                                • You can insert your FET between + leads: FET drain to the source battery, FET source to the seconary batteries.
                                • Mount a car fuse 10A at source batt for safety of your setup
                                • Before you go life - insert for initial test a 24V bulb between source batt and FET drain in order to protect your switch in case of malfunction.
                                • Many setups are told to do well if they have a single and heavy connection to earth. So be prepared to check it as well.
                                • The effects expected might arise at certain resonance points of the batteries themselves. The repetition frequencies shall be increased slowly with longer rest after any change. Check for battery behaviour (secondaries)
                                • Batteries are told to discharge first and start charging later on with this new energy. It could be an advantage to use brand new batteries never being charged before with "hot" energy.
                                Last edited by JohnStone; 10-24-2012, 09:00 PM.
                                Experts spend hours a day in order to question their doing while others stopped thinking feeling they were professionals.

                                Comment

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