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  • Testing new mosfet

    Hi all,

    I've been playing with SSM40N03P (N channel) mosfet, this model has 17 miliOhm RdsOn, 30v max. and 40A. I found interesting its specifications (TdOn, Tr, TdOff, Tf, etc).

    Datasheet:
    SSM40N03P pdf, SSM40N03P description, SSM40N03P datasheets, SSM40N03P view ::: ALLDATASHEET :::

    CAUTION: RISK TO BURNING, BE CAREFUL

    I have tested in 12v to 12v charger mode.
    To prevent the voltage rise always load is connected (target battery). Be careful.

    I tested with one mosfet and two in parallel, 17 and 8 mOhm respectively.
    , not bad

    Drain current: 10mA to 2.5A
    Efficiency: around 60-65%
    I have not seen difference.

    6 NTE2397 mosfets (Ufo circuit) have a RdsOn Eq. to 92 mOhm.
    My 6 SSP16N50C3 mosfets have a RdsOn Eq. to 46 mOhm.
    My 3 SSP2N60B mosfets have a RdsOn Eq. to 262 mOhm.


    Regards
    http://Cacharreo.com.es/foro

    Comment


    • Originally posted by kEhYo77 View Post
      I ordered some parts and I'll have to wait for couple of weeks, because they are so exotic and quite expensive ! Daaamn
      Anyways, I believe we can go a bit further with this and do coil shorting on peaks of those high frequency radiant oscillations from collapsing field.
      Ismael Aviso style...
      Hi @kEhYo77,

      The circuit is interesting, good components.

      Some questions:
      C4 is output?
      The coil has no power source, right? (only shorting)
      You've done some preliminary tests? Some time ago I wanted to do something like.

      Waiting for your results


      Regards
      http://Cacharreo.com.es/foro

      Comment


      • Hi @torpex
        The circuit is interesting, good components.
        Thx
        C4 is output?
        Yes. But the schematic is not finished. I'll expand it soon.
        Where C4 is, there will be a type of a sensor, for example a comparator like 393, or zero crossing detector, that would take measurement and send a signal to the microcontroller to start the shorting precisely through a hardware interrupt function (very fast).
        The coil has no power source, right? (only shorting)
        I made it look universal so that it can be used with magnets exciting the coil, or a separate 'charger'...
        My idea is to use a transformer and do the shorting on a secondary coil while the primary is in LC resonance!
        The shorting process, if done right, is non-reflective to the source, so it should be interesting because the device would be wasting very little energy to keep the resonance going...
        You've done some preliminary tests?
        Not the type you would expect but I'm getting there...
        I tested a circuit from this site (the one below) and I found it not working properly. I ditched the last stage of that circuit and replaced it with a 555 + LM393 and now its performance is ideal. I'll post this updated schematic because it is good alternative for people without microcontroller skills...

        Peace!
        Last edited by kEhYo77; 06-11-2012, 02:15 AM.
        “ THE PERSON WHO SAYS IT CANNOT BE DONE SHOULD NOT INTERRUPT THE PERSON DOING IT ! ”

        Comment


        • Oops

          Originally posted by larryross View Post
          You should figure out why you have too high current draw and fix that... not use a device at max to limit current, using the LM317 at full current will cause a lot of heat and wasted energy and eventual failure of the device. You are doing like doctors do and treat the symptoms and not the cause. Always use a current limiting resistor to control small currents when you have to.

          No I didn't mean the feedback resistor don't change that one, I was talking about the resistor that is used to bias the fets.

          No that isn't true... pull up resisters are used to increase out put power of a device above what it would normally output or to make sure it out puts the right voltage which also helps to maintain a proper signal.


          Got to go for now
          Larry

          Hey Larry,

          It was a big weekend and what I wrote on Sunday makes NO sense when I look at it now on Monday morning Please ignore that post

          However, the LM339/393 IC's have issues of seriously high current draw following the circuits here and I'm not sure why???

          I keep using the 555 timer PWM circuit, works fine from the first try and has for a month now. Can adjust the current from 200mA when the Radiant enters to >1.5A using 12V or 24-36V with the LM317 (set to 12.7V) and I know the LM317 circuit is fine, the problem for me is in the LM339/393 circuits.

          The outputs of the comparators never seem to oscillate for me and only work as a simple logic high/low circuit by adjusting the reference voltage.
          The complete circuit can light up a Neon or CFL but the current draw is high as I stated and the output wave is a mess. This is a replication of the circuit/s here and have made no changes and come to the point where I'm open to asking for help.
          Or just use 555 based PWM circuits

          Have you made that circuit yet or any from the uploaded circuits yet?

          Or anyone else making a LM339 or LM393 based PWM circuit?

          @Bob, have you had any problems other than the blown FET's?
          And have you managed to obtain a result with NPN's yet?

          P.S - About to try the 555/LM393 circuit that was uploaded here on the earlier pages after I change the cap/resistor to lower from 641kHz and report back tonight I hope.

          Regards
          Zero

          Comment


          • Congratulations UFO, and thank you for sharing years of hard earned knowledge. For those that cannot read between the lines, would you please be kind enough to enlighten us of the capabilities of these circuits... i.e. what output could be expected for a given input, and the restrictions, given that changes may need to be made (???) to the configuration of target equipment.
            Cheers and Thanks, Rocketfuel

            Comment


            • I am having a problem deciphering exactly what your problem is. I will try to get clarification below so please just answer the all question to the best of your ability.

              Originally posted by ZeropointEnergy View Post
              Hey Larry,

              It was a big weekend and what I wrote on Sunday makes NO sense when I look at it now on Monday morning Please ignore that post

              However, the LM339/393 IC's have issues of seriously high current draw following the circuits here and I'm not sure why???
              Exactly which circuit diagram are you using or did you try all of them? Tell me which post the circuit appears in. Are you absolutely sure you replicated the circuit/s correctly and didn't make any change because you didn't have a certain component? What kind and size of capacitor are you using?

              I keep using the 555 timer PWM circuit, works fine from the first try and has for a month now. Can adjust the current from 200mA when the Radiant enters to >1.5A using 12V or 24-36V with the LM317 (set to 12.7V) and I know the LM317 circuit is fine, the problem for me is in the LM339/393 circuits.
              How and where are you measuring the current?

              The outputs of the comparators never seem to oscillate for me and only work as a simple logic high/low circuit by adjusting the reference voltage.
              The reference voltage for the oscillator circuit in these diagrams are set by the 100K resistors on pin5 and isn't adjustable.

              This would indicate your cap isn't working for some reason.

              This is how it should work:
              The current enters the oscillator circuit through the feed back resistors to the neg. pin of the comparator and causes the cap (also connected to the neg pin) to charge... when the cap charges to more than the reference voltage the comparator output drops to 0 and the cap starts to discharge when the cap charge drops below reference voltage the comparator out put goes high and the cap starts to charge again through the feed back resistors and the cycle starts all over again.


              The complete circuit can light up a Neon or CFL but the current draw is high as I stated and the output wave is a mess. This is a replication of the circuit/s here and have made no changes and come to the point where I'm open to asking for help.
              So you have a fet/s connected to the output of the oscillator so you are using the 36V power supply to power the CFL? How do you know the current is too high? The load usually determines the current draw.

              Which complete circuit are you speaking of here? I hope one that is oscillating for you, because you can only control the current using the pulse width circuit and it has to be functioning properly.


              Or just use 555 based PWM circuits

              Have you made that circuit yet or any from the uploaded circuits yet?

              Or anyone else making a LM339 or LM393 based PWM circuit?

              @Bob, have you had any problems other than the blown FET's?
              And have you managed to obtain a result with NPN's yet?

              P.S - About to try the 555/LM393 circuit that was uploaded here on the earlier pages after I change the cap/resistor to lower from 641kHz and report back tonight I hope.

              Regards
              Zero
              Yes Zero I have finished my circuit and I did the dual out put one using the LM339. I will try to get it tested today. I will post my success or failure.

              Hope the above helped a little.

              Regards
              Larry

              Comment


              • Hi All
                I am not sure why, when we are trying to replicate a man's work we are using so many different circuits. I have built a dual output circuit using the LM339, but would have built just the 555 PWM circuit that UFO did except he stated that the frequency and the duty cycle would need to be tuned so I figured it would be easier to have an oscillator that would do both. Then you said it would be helpful to have a dual output oscillator so that is what I built.

                So I guess I would have to ask... UFO how did you tune the frequency and the duty cycle just using the 555 PWM as you first suggested? Perhaps if you had explained that everyone would have built the 555 PWM and we would be much further down the road. Your sheep are scattered and running off a cliff.

                I think a more organized and exact instruction would be much easier to follow (for me anyway). I really hope you do a comprehensive pdf instruction manual (as boguslaw suggested) that if followed to the letter would work as claimed. This would be awesome and much less wasted construction time. This way each could work at their own pace and still come here for help if needed. Please don't misunderstand my suggestions... this is your thread and your device so I will follow and help when I can and try to be patient. I really want to know about and build the complete system. Hope to test my oscillator today after I get back from the gym.

                Regards
                Larry

                Comment


                • Hello Larry and ALL

                  Originally posted by larryross View Post
                  Hi All
                  I am not sure why, when we are trying to replicate a man's work we are using so many different circuits. I have built a dual output circuit using the LM339, but would have built just the 555 PWM circuit that UFO did except he stated that the frequency and the duty cycle would need to be tuned so I figured it would be easier to have an oscillator that would do both. Then you said it would be helpful to have a dual output oscillator so that is what I built.

                  So I guess I would have to ask... UFO how did you tune the frequency and the duty cycle just using the 555 PWM as you first suggested? Perhaps if you had explained that everyone would have built the 555 PWM and we would be much further down the road. Your sheep are scattered and running off a cliff.

                  I think a more organized and exact instruction would be much easier to follow (for me anyway). I really hope you do a comprehensive pdf instruction manual (as boguslaw suggested) that if followed to the letter would work as claimed. This would be awesome and much less wasted construction time. This way each could work at their own pace and still come here for help if needed. Please don't misunderstand my suggestions... this is your thread and your device so I will follow and help when I can and try to be patient. I really want to know about and build the complete system. Hope to test my oscillator today after I get back from the gym.

                  Regards
                  Larry

                  Hello Larry,


                  First thanks for helping others on this enterprise!

                  You are correct and very clear in all explanations to Torpex and ZPE.

                  Now, I have NOT build the LM339 NOR the LM393 Circuits, Bob French did, and it worked out for him in the first part, it is very unfortunate that now He is having problems with it. Therefore I CAN NOT tell any of You about the LM Circuits because I simply have not built them.
                  The 555 Timer I have posted several pages back, is the one am using up to now, honestly, I am working very hard in other fields related to Motors Generators now, and since the 555 works fine for me, I do not have a "hurry" to make the other LM circuits as off right now, I eventually will, but not at present time.

                  The 555 CAN NOT adjust the Duty Cycle, just the frequency, and it is up to certain "volume Up" that it will keep frequency, then it moves to an almost linear state (not good)...However, for my testings I do not require to go that high (so far).

                  The second Oscillator I build based on Dual Channels (P and N Channels) is just another 555 added to original circuit...where I used the same feeding source from the same LM317, feeding the first IC 555, and all I did was derive from leg 3 of First 555 to leg 2 (trigger) of second 555, and 2nd 555 leg three (3) will output to gates of P-Channels with the proper bias to gate and same 100 ohms-330ohms to each P Channel Mosfets Gates...same deal. except I used a different value Resistor as Bias of gates to Positive (Source)of 4.7K. That diagram is also here, I took it from a Mosfet Testing circuit for both P and N channels off the net, based on two 555 timers.

                  Related to making a PDF, I will love to do it, however, my life is turning out a bit of a nightmare for me...I have personal issues now, I am having problems...so I am sorry, but right now I can NOT get involved in such nice article.

                  So, I recommend to ALL NEW Members getting here, to please, go back in time and review every post here, slowly, and make the right annotations, all is there, believe me.


                  All We need is an oscillator capable to start with very low square pulses from low Hz (10-100) all the way to 800-1000Hz, that is what I have without Duty Cycle...and it works. Now, if you guys want to go "fancy and sophisticated" that is fine, however, by doing that you are "driving on your own to other places", so for those starting now, please, DO NOT try to start "jumping" from stage A to K...

                  The System works great with a 555 timer, or two for dual channels, and an LM317 Voltage regulator...with milli volts of input you will get hundreds of volts out...and could blow a 23 to a 120 Watts CFL if you please to do so...Now if it does not do it, simply and obviously, You have something wrong there.

                  I gave the specifications of ALL my Coils, they are also on ALL my videos...
                  I have even posted here, the spec's of my secondaries, that I have not made that video yet.

                  Bob French went back and spent three to four days reading every post here...and He build it based on the best choices he grabbed and experimented...and He was very successful, the pictures are here...It is very bad that now his oscillator stopped working, but I know He will get it repaired soon...

                  Prochiro (Dana) also built it and it worked out great for him
                  Bbem (Bert) also made it and it worked out...

                  And there were others I can not remember ...but they have written it here...

                  Now, to my way of thinking...IF JUST ONE SINGLE GUY HERE, by reading the whole thread, is able to make it work beautiful...then, it should work also for all the rest, and even more, if some of you have such an incredible and great background in electronics and electrical fields.

                  As soon as I recover from my problems, I will be back and very active here...I will build the LM Circuits, and make a detailed PDF for all of you.

                  Thanks very much for trusting me here from the beginning, I appreciate that.
                  And excuse me for not having the time right now to spend here. Life sometimes play Us a bad joke...it is always expected.

                  Regards to all


                  Ufopolitics
                  Principles for the Development of a Complete Mind: Study the science of art. Study the art of science. Develop your senses- especially learn how to see. Realize that everything connects to everything else.― Leonardo da Vinci

                  Comment


                  • Hi ufo, thanks for sharing and your issues are all of ours in the end, all in the same boat ultimately.
                    The malevolent forces do not like people that do good works.
                    Though it is coming time, very, very soon, where the good people of this world will be able to choose the life they wish to live.
                    Try and stay positive, kind, compassionate and loving, because that is what they don't want us to be.
                    They want us divided and uncaring and unfortunately they have built human living systems that do a very good job at that.
                    The controllers and manipulators of this world, their time is coming to an end.
                    True peace ,True love, True freedom and True abundance is our divine birthright and cannot be denied humanity, so it is, so be it.
                    peace love light
                    tyson

                    Comment


                    • Thanks for such nice words Tyson!

                      Originally posted by SkyWatcher View Post
                      Hi ufo, thanks for sharing and your issues are all of ours in the end, all in the same boat ultimately.
                      The malevolent forces do not like people that do good works.
                      Though it is coming time, very, very soon, where the good people of this world will be able to choose the life they wish to live.
                      Try and stay positive, kind, compassionate and loving, because that is what they don't want us to be.
                      They want us divided and uncaring and unfortunately they have built human living systems that do a very good job at that.
                      The controllers and manipulators of this world, their time is coming to an end.
                      True peace ,True love, True freedom and True abundance is our divine birthright and cannot be denied humanity, so it is, so be it.
                      peace love light
                      tyson


                      Thanks SkyWatcher!


                      Thanks, very nice and encouraging words my friend...
                      Let's hope we all see that blue sky we are waiting for ...very soon.
                      You are completely right my friend.

                      Thanks

                      Ufopolitics
                      Principles for the Development of a Complete Mind: Study the science of art. Study the art of science. Develop your senses- especially learn how to see. Realize that everything connects to everything else.― Leonardo da Vinci

                      Comment


                      • Originally posted by ZeropointEnergy View Post
                        ...
                        I thought the 10k pull up resistor was to protect the LM339/LM393 to I think 18mA or so, is this true?
                        ...
                        Regarding output pin of coparator LM339 / LM393:
                        These components feature an so called open collector output - that is - they contain a transitor to GND only and can sink current only to GND. The only internal output transistor is connected with its emitter to GND and the collector is open - it is directly connected to the output pin without any further internal connection.
                        see

                        Why is this so important?

                        The notion above determines that our IC can NOT source any current to the subsequent gate of the FET. It definitely can not control the FET in order to switch on. There are a plurality of reasons why open collector (OC) is used in electronics but it will defer explaining that. Comprehend it as unfortunate fact.

                        So please understand that the only source of current to the gate of the FET is the pull up resistor. Unfortunately the gate features a gate capacity of approx. 1 nF and this needs to be charged higher than 10V before usual FETs are fully switched on. (see data sheet)
                        If a capacitor is being charged by a fixed voltage and a resistor - the action behaves not linearly. see Here we can get the notion that it takes fairy long time in order to get a FET completely in ON condition.
                        In low condition all the current sourced by the the pull up resistor will be drained to GND. The output of the comparator can sink minimum 6mA / typical 16 mA (data sheet). So let's decide to load the output with approx. 10mA in order to get a safe design. We will get about this current by a 1.5K resistor (alternatively two 3.3K in parallel) at 12 V supply.

                        Now waht activation time of the FETdo we talk of?

                        See RC CALCULATOR

                        If you enter:
                        12 V / 1.5K / 0.001µF = 1 nF / and 10V charge voltage you get a time of 0.0027 = 2.7µS
                        Same with 10K -> 0.0189ms = 18.9µs

                        Both values are not exciting but the first one is much more suitable in order to prevent FETs to get hot because of lazy switching! So please understand that it makes no sense to get super fast FETs and control, them by a lazy messanger.

                        No let's calculate multiple LM393 outputs in parallel:
                        We can take two comparators and two pullups in parallel = 750Ohm -> 1.2µs
                        Same with 4 outputs in prallel: = 375Ohm -> 0.7µs = 700ns
                        The last two examples perform the capacitor charging in the time area of the switching time of the comparator. That is a fair tradeoff and more current makes no sense because it will not increase the switching speed considerably. The limitation wil remain teh switching tiome of the IC.

                        EXCEPTION:
                        You drive several FETs in parallel. You have to deal with multiple of 1nF in parallel. It would be a good choice to spend for every FET a dedicated double comparator LM393 in parallel and place it very near to the gate of the dedicated FET. (We did not talk about inductance of long thin wires yet!!)

                        See sample schematic

                        Now let's calcualte a very negative example in contrast: 4 FETs / single drive 10K -> 71.7µs!!!!

                        I am convinced that some of your setups suffer an low drive capacity. This is my suggestion in order to drive your FETs in a more safe operation area while dealing with low cost circuits.

                        BTW: The NE555 can sink about 20mA (similar to 2xLM393) but can source about 200mA at switching time of about 200ns switching time - that is a big difference to 10 or 20 mA - is it?.
                        Last edited by JohnStone; 06-11-2012, 09:24 PM.
                        Experts spend hours a day in order to question their doing while others stopped thinking feeling they were professionals.

                        Comment


                        • oscillator circuit

                          Hi UFO and everyone,

                          Hey ufo, i havent posted for a while, but ive been working double time, and ive now got a scope, some meters, 15000 ft of 20 ga, hundreds of feet of 33 ga, loads of run motor caps,(find an electrical/motor store for deals on wire)Im gonna start winding a big coil around a frame ive been thinking aboutuess some people are still having trouble with the oscillator?

                          Comment


                          • oscillator

                            sorry,

                            I did not finish or edit that post and sent it.

                            So, i made some videos of some tests, as i was building a dual high low switch. It's based on 555. It is frequency and duty variable. The 555 can be a pain but we are not using the 555 output, the 555 is ringing a capacitor, like the 393 circuit.

                            I'll post the circuit, and then i will try to post the videos of circuit working.

                            Thug
                            Attached Files

                            Comment


                            • @Ufo, hope you will recover from your problem soon.
                              @JohnStone, is your sample circuit correct? Shouldn't U3,U4 be identical connected as U1, U2?

                              Comment


                              • thugsugly - YouTube

                                Here are the videos that went with the builds to get a good working dual high low switch. There aere 6, I hope they help some people.

                                I'm using an n-channel to drive the p-channals for high side, because I'm switching more then my signal voltage, and n-channels for low side.

                                Thug

                                Comment

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