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Author Topic: Kapanadze Cousin - DALLY FREE ENERGY  (Read 5400286 times)

Offline AlienGrey

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17445 on: June 19, 2017, 12:51:17 PM »
TL494 driver device. Notice 3 control pots PW Dead Time (2nd  PW over ride of PW) later removed as error amp shuts down device.


Also observe oscillograph of what looks like unstable driver stage. Went through all circuitry and re wound yoke found unstable wave to be ferrro related. Spoke to T1000 and note in later rewind yoke problem removed.


Notice 3rd pot removed (dead zone wiper connected to 0volts
« Last Edit: June 19, 2017, 04:42:28 PM by AlienGrey »

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17445 on: June 19, 2017, 12:51:17 PM »

Online NickZ

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17446 on: June 19, 2017, 04:59:53 PM »
  Itsu:
  Thanks for checking things out, as well as doing the math.
  I believe that that scope readings were taken on the .5/div setting. Not the .2/div.
  The ceramic cap placed on pin #5 is a 102. So, that part should be ok.
  Today I'll be looking into the mosfets and their connections to see if I can find any problems there. As there does seam to be something not right when comparing the two fets and their scope signals. I'll know more about that later today.

   Pinoy_Tech:  Good to see you back, and posting again.
   Thanks for the information and details on your Tl494/UC4420 circuit. Although it took me a while to see what my problem was with it, I think that it's working pretty well, now. Thanks again for posting your design.  As it was similar to what I wanted to build, I thought I'd build it just like you designed it, but with a just few modifications in order to simplify it to bare minimum components.  I'll continue testing it, and connecting it up to the rest of the device today.
   
   


Offline itsu

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17447 on: June 19, 2017, 09:24:39 PM »

Quote
I believe that that scope readings were taken on the .5/div setting. Not the .2/div.
The ceramic cap placed on pin #5 is a 102. So, that part should be ok.

Nick,   i think you are right, 0.5ms/Div., however that makes it even worse as your max. frequency then would be 1.8Khz or so.
If you have a 1nF cap as C4, then Rv2 + R2 cannot be the mentioned 50K + 2.2K else your frequency would be between 12Khz to 200Khz.

Double check your 50K pot and R2.

Itsu

Online NickZ

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17448 on: June 20, 2017, 03:04:00 AM »
    Both pots are 50K. Resistor is 10k. Cap is ceramic 102.
   But there's something else wrong as I only get 4 volts out of the 15v regulator, and it's new, I installed it just a couple of days ago. First time that I tested it though. I can maybe run the drivers on 12v, for now.
But, I'll probably have to order more FETs, if I don't find any more good ones left around here. As it looks like I also burnt one of the two FETs, again.  Something is not right, with that, as well.


Offline Hoppy

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17449 on: June 20, 2017, 09:50:54 AM »
    Both pots are 50K. Resistor is 10k. Cap is ceramic 102.
   But there's something else wrong as I only get 4 volts out of the 15v regulator, and it's new, I installed it just a couple of days ago. First time that I tested it though. I can maybe run the drivers on 12v, for now.
But, I'll probably have to order more FETs, if I don't find any more good ones left around here. As it looks like I also burnt one of the two FETs, again.  Something is not right, with that, as well.

Nick,

Have you got small ceramic caps across the input and output of the 15V regulator? STMicroelectronics data sheet shows 0.33uF on input to ground and 0.1uF on output to ground.


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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17449 on: June 20, 2017, 09:50:54 AM »
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Offline verpies

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17450 on: June 20, 2017, 04:57:38 PM »
STMicroelectronics data sheet shows 0.33uF on input to ground and 0.1uF on output to ground.
These caps also have ESR limits.  Without them the linear regulator can oscillate.

Online NickZ

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17451 on: June 20, 2017, 08:48:53 PM »
  Hoppy:
  I've got two filter caps at both the input as well as at the output of the 15v regulator. They are the ones that are recommended by Ruslan's circuit diagram. The 1000uf and also the smaller 104J capacitors, on each side of the regulator. But, if I disconnect the output side of the regulator, I get 24v on the input of the regulator, but no voltage on the output side of the regulator. So, it's gone bad.

  Funny thing though, last night with only 4.2 volts somehow getting to the UC4420 drivers, possibly somehow through the ground side of the regulator, which was still connect up, I WAS getting a square wave signal at the drains. First time.  But, somehow connecting the drivers inputs up to 12v from a battery, I get no drain signals at the drains.
Plus now, not only are the gate signals clean, but they are back to the gates firing at the same time. And the duty cycle going to 100%. So, get that... for a learning curve to unwind.

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17451 on: June 20, 2017, 08:48:53 PM »
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Offline AlienGrey

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17452 on: June 20, 2017, 09:19:13 PM »
These caps also have ESR limits.  Without them the linear regulator can oscillate.
we always use to use 0.47 Uf Tants they were recomended by the manufactures and never vhad any trouble with instability.

with the torerroid use a 4.7 uf (Good quality) where the power goes into the coil and the driver device MosFets Sauce or Igbts emitters and keep the wires as short as possible.

Offline itsu

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17453 on: June 20, 2017, 09:39:13 PM »
Nick,

So your 15V regulator for the MOSFET drivers is defective, that part i understand, so replace it.

The rest of your info is not making much sense to me.

first of all, you mean TC4420 for the drivers, as no UC4420 exists, and then you talk about signals at the drain, no drain signals, gate signals are clean but firing at the same time
duty cycle going to 100% etc.

Concerning the screenshots, they show the drain signals? (thats what they are called),
but CH1 is at 2V @ 10x = 20V/div. meaning a square wave signal of about 60V??
CH2 is at 5V @ 1x = 5V/div. meaning a square wave signal of about 12.5V??

Why is CH1 at AC coupled and CH2 DC coupled?

The sequence of these drain signals look OK to me, the upper drain is active (pulling the voltage to ground) when the lower drain is inactive (voltage high).
Duty cycle looks something like 33% (on the gates). This way your MOSFETs should be OK.
Frequency looks very low still (830Hz)

Itsu

Offline AlienGrey

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17454 on: June 20, 2017, 10:00:24 PM »
  Hoppy:
  I've got two filter caps at both the input as well as at the output of the 15v regulator. They are the ones that are recommended by Ruslan's circuit diagram. The 1000uf and also the smaller 104J capacitors, on each side of the regulator. But, if I disconnect the output side of the regulator, I get 24v on the input of the regulator, but no voltage on the output side of the regulator. So, it's gone bad.

  Funny thing though, last night with only 4.2 volts somehow getting to the UC4420 drivers, possibly somehow through the ground side of the regulator, which was still connect up, I WAS getting a square wave signal at the drains. First time.  But, somehow connecting the drivers inputs up to 12v from a battery, I get no drain signals at the drains.
Plus now, not only are the gate signals clean, but they are back to the gates firing at the same time. And the duty cycle going to 100%. So, get that... for a learning curve to unwind.
Try inverting one of the winding going from + volts to the drain.

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17454 on: June 20, 2017, 10:00:24 PM »
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Offline TinselKoala

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17455 on: June 20, 2017, 10:22:06 PM »
Nick, it is very difficult to interpret your scope "Drain" signals if the channel V/div, input coupling, and probe switch settings are different between the channels.

Please repeat the "Drain" shot with all scope settings the same for both channels (and check the switch on the probe itself as well.) DC coupled, v/div the same for both channels, probe switches on "10x", probe tips at mosfet Drain pins or mosfet tabs (which are also connected to the Drains), probe ground references at Source, ie common negative rail. (Also be quite sure that the mosfet heatsinks do not short the two mosfet Drains together.)

During some time when both Gate signals are firing simultaneously, can you please check the Voltage on the Pin 13 of the 494? This is the "steering" pin. If it sees "ground" or zero voltage, it tells the chip to fire both outputs simultaneously. For normal Push-Pull or alternate output firing, this Pin 13 must see the Vref voltage which appears on Pin 14 from the chip's internal voltage regulator.

Personally, I think it is time to consider scrapping the circuitboard you are using now, and building another unit from scratch, incorporating what you've learned and making the various connections easier to see, understand and work with. And do get your hands on some 8-pin DIP TC4420 driver chips!

Offline Hoppy

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17456 on: June 20, 2017, 11:58:21 PM »
Nick,

Please take TK's advice and rebuild your board from scratch. Experience tells me that by now with all the alterations you have made, your board must be very messy and a messy board is a breeding place for connection faults.


Online NickZ

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17457 on: June 21, 2017, 12:52:36 AM »
   Well, sorry guys, but I'm not in position to start from scratch, as all I've been doing is starting from scratch, for the last two months or so. The board is not so bad as to chuck it.
   It's not the board at fault, but the builder of it, instead. I could make the same errors on another board if I don't work out what's wrong, at this point.
   
   Don't worry about not being able to see it all clearly, for now. It's a prototype, and I'll figure it all out in time.
The main problem as always, is getting all the needed parts.

  There's a reason that the scope knobs settings are that way, (in different positions). As one of the TL494 channels has higher amplitude than the other, or at least it did. And yes, TK, one of the scope probes was set on 1X and the other on 10X. I corrected that. I'll place the knobs the same in my next pic. No need to try to figure out that last signal. I think that I got it.
  But, even without the 12v or 15v going to the TC4420 drivers, they will give a signal to the drains. Even on as little input as 1.8v. And now when I give these same TC drivers 12v from a battery it cuts off that 1.8v signal it was getting before to the drains. So, I get nothing at the drains when the drivers get the normal 12 or 15v input. But, I do get drain signals, on just the 1.8v input to the drivers, which they get from somewhere.
Just trying to get a grasp on all this. Makes no sense to me, either. But, there's a reason for everything.
 
 

Offline AlienGrey

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17458 on: June 24, 2017, 01:52:01 PM »
According to the attached schematic, the transistor Q3 will invert the output of the NAND Gates in Integrated Circuit U3.
The polarity of the low duty-cycle pulse appearing on the output of U3 is determined by the switch S2.

Also, because Q5 is a N-Channel MOSFET then a positive voltage on its gate will make it conduct between Source and Drain.
If Q5 remains conducting too long then a destructive current will flow through L5, T1 primary and Q5.

P.S.
The attached schematic is identical to yours (identical circuit) but it is translated to English and has four additions:
1) Description: "Monostable Multivibrator"
2) Description: "DSRD Driver"
3) Description altered to: "DSRD Nano Pulser"
4) Component designations.
Hi guys can we just change the subject a moment and get back on track ????????

Have a look at this diagram of the ORIGINAL!  ok
can i draw your attention to this circuit for a while, in particular, the toroid, notice no details are given on this device no ferrox permeability details or winding details and also note the drive is directly connected to the grenade L1 primary, or the matching of an unknown impedance to a High impedance factor I find it unbelievable no one has picked up on this so far, has anyone got any information as I can find nothing on any of the early pages ?

oops just noticed the nano-drive circuit, notice the extra drive inverter transistor ;) err that's going to cause a problem or two ;) perhaps a PNP would do better there.
AG


Offline AlienGrey

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17459 on: June 24, 2017, 02:47:01 PM »
Hi guys!

Posted photos of "green transformers". This is what I found in my pantry. This is a military standard for special transformers, of which there are a huge number of specifications. Produced on the U-shaped cores and toroids. I disassembled the transformer, such as the Dally.
The core is made of an alloy of "alsifer" (aluminium, silicon, iron) or mu - permalloy to avoid saturation. Cores are designed to operate at low frequencies up to 10 kHz, where the use of ferrites impossible.
Dally just picked suitable transformer for his DC-DC converter.
To make such a transformer  I can recommend the rings
made out of u-permalloy.

Regards
Vasiliy
0 special devices !! a yoke ????? hardly 10kh Nickel Mu metal alloy!
It might look like junk but it most certainly is not!

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Re: Kapanadze Cousin - DALLY FREE ENERGY
« Reply #17459 on: June 24, 2017, 02:47:01 PM »

 

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