Author Topic: Mr. Feedback circuit  (Read 8438 times)

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Re: Mr. Feedback circuit
« Reply #16 on: September 06, 2015, 20:17:08 pm »
i will check if i´m able to do it from here (some dont allow non american citizen or living outside their region of interest)... my friends here are helping me to make a video to make a fundraiser here too.. but this networks have some very good intention people that are havituated to donate...


I just insisted with my friend on the paypall link as if you donate thru the fundraiser sites most of them keep up to 15% of it... so those who could donate directly would have help more with lower reduction of the donated money for me to receive...

as i said i will do it most because there is also their specific public too...

thanks really much for the idea
« Last Edit: September 06, 2015, 22:12:20 pm by sebosfato »

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Re: Mr. Feedback circuit
« Reply #17 on: September 08, 2015, 08:30:57 am »
as i promissed the feedback now workd and its circuit will be released with my major modifications to the pll circuit that makes the transistor never burn again, an incredible frequency range and stability... also i´m doing something to be able to gate while in autotune mode...

i´m willing to send in exchange for 1200$ a working full pll circuit box with scanning and gate... or in exchange for that 30kv differential probe

it takes me maybe a week to make it for i can send it... but the payment in advance... for i will need to make some buying of the probe and parts to make it..  i will make in such way that if you want to change the range you have trim pots for the parameters and make the changeble parts easy to access.. the only thing you will need is the variac and a dc capacitor or any dc source.. it will be bivolt and work from the wall or straight from car battery..

will have upgradable inputs for sense comands like gas pressure

no accelerator leds no digital

thats my another proposal to whoever can be interested in help and have something nice to work in hands.. 


thats my add.. but i will release as soon as i get the probe in my hands... i´m doing a lot of work trying to bring all my friends into this... maybe some help make it faster...

i even already described some of the modifications...

but i´m more likely to want to share full diagrams to who donated or wanted to help anyhow...

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Re: Mr. Feedback circuit
« Reply #18 on: September 10, 2015, 00:29:43 am »
i have found another interesting fact...

the feedback circuit meyer proposed actually worked as i said even if is somewhat wrong..

but in the way it is originaly design in the patent it can be usefull to drive a resonant load... and in that way i had it working in 2008 in italy... now i know why it worked than...

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Re: Mr. Feedback circuit
« Reply #19 on: September 21, 2015, 15:22:10 pm »
From what I'm reading, you are saturating your coils.  Don't do that.

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Re: Mr. Feedback circuit
« Reply #20 on: September 21, 2015, 19:43:35 pm »
i guess the core is saturating on resonance is not working like a normal transformer... its a ringing transformer...

the saturation may be at the top limit voltage along with corona discharges when the coils are not in oil...

i got up to 50kv in oil no proble.. but in that case there was two cores one with primary and secondary and the other with the chokes....

yes kitchen oil  :o

i notice the saturation in the primary when it start to decrease primary impedance.. i have a meter for that so basically the resonance is the top limit... is it that saturates the core.... should not be bad... but the more coils the lower energy dissipated on the core and probably higher voltage...  but also slower







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Re: Mr. Feedback circuit
« Reply #21 on: January 20, 2016, 16:40:36 pm »
for low frequency this is a good circuit for detecting zero current or max min voltage crossing by zero current crossing...

at this you see i added two 100nf capacitors for its to work at 60hz...

the 1 Megohm provide a positive feedback...

the 100kohm together with the 5v source and diode keeps the opamp signal down until it has the min level to revert the diode forward biased...

the input resistors as i described goes after the diodes...

you can use 741 for the low frequency case and should not give any problems..

the signal output won't be from rail to rail so you should add an inverter after it for some applications... for the pll is not needed as it uses a rise and fall edge detector on phase comparator 2

Regarding yet the pll i found that is useful to use one of the 4016 switches that is not used to switch the signal from pin 13 to the filter of the pll using the gate signal... this allow the pll to keep in tune with gating operations (did not tried yet but i´m damn sure this is the simplest workaround needed)
« Last Edit: January 20, 2016, 17:02:36 pm by sebosfato »

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THE FEEDBACK SECTION
« Reply #22 on: August 06, 2018, 23:15:18 pm »
for low frequency this is a good circuit for detecting zero current or max min voltage crossing by zero current crossing...

at this you see i added two 100nf capacitors for its to work at 60hz...

the 1 Megohm provide a positive feedback...

the 100kohm together with the 5v source and diode keeps the opamp signal down until it has the min level to revert the diode forward biased...

the input resistors as i described goes after the diodes...

you can use 741 for the low frequency case and should not give any problems..

the signal output won't be from rail to rail so you should add an inverter after it for some applications... for the pll is not needed as it uses a rise and fall edge detector on phase comparator 2

Regarding yet the pll i found that is useful to use one of the 4016 switches that is not used to switch the signal from pin 13 to the filter of the pll using the gate signal... this allow the pll to keep in tune with gating operations (did not tried yet but i´m damn sure this is the simplest workaround needed)

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Re: Mr. Feedback circuit
« Reply #23 on: March 28, 2023, 09:45:16 am »
In the good will of making things work i think we got the idea of the feedback circuit wrong for a long time…

the feedback actually should take the current feedback and if its above a certain value the feedback should not give signal thats why no one found water resonance yet by the perspective of the circuit design

how you get current feedback? i was looking into current transformers but from what i can see it wont get a real current phase for our kind of application so it would also fail..

the only way i see it is by using a resistor with a small signal transformer connected across it.. this mean that power will need to be dissipated anyway to get it to work i dont know any other way of reading current except for hall sensors… however due to the very small currents expected at the desired condition it makes a quite complex task since on the other mode current can be 1000 times or more than the required sensed condition..

so the idea is to have a trimpot that cuts off the signal if its level is above a certain point… and also retain good signal noise ratio..

so the idea is we need.a resistor in series with the cell with a small toroid connected in parallel to it with secondary just like stan place in the patent… with center tap connected to vcc however its made in a way that if the input voltage exceed a value it will actually block it… this is the threshold of what is the desired condition and what is not…

i think is possible that meyer sensed the frequency and locked during gate off and than the amplitude change with the system already in lock

this would easy things since it would not require much dissipation on wrong frequency

i decided to move on to much higher speed comparators to be able to have more chance to work and they are pricy

so i decided also that im going to make this feedback circuit in a nice aluminum case with dc input and bnc signal output connector to get rid of any noise transporting the signal up to the pll

if you are interested in buy one of this pcbs they are going to be available soon..

im going to place my website store here so you can buy my developed and assembled boards for your projects

Or you can research spend money and time and develop it yourself.. i already shared so many stuff and how drank from this water have certainly learn a lot… and know how much time and money are spend

I plan to make just 2 or 3 boards

but the most important one is for the feedback that is going to be placed near the vic and connected to the main board pll thru bnc cable if we dont get good shield there will be noise so also the pll box must be in metal.. and is possible the vic also must be inside metal case to reduce the noise…

let me know if you want to buy one of this boards.. or if you know a board that is already ready to buy with a very high speed comparator let me know too… cause certainly is going to cost me more to make mine specialy if only for me,,

min order in china is 5 boards.. i want at least 2 for me for now… of course if there are more people interested we can make more…