Electrical / Electronic Devices > Tariel Kapanadze's Devices

Kapanadze / Dally

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ion:
I stumbled onto this schematic (posted on OUdotcom) and thought it be interesting for discussion.

It is someone named Dally's attempt at Kapanadze replication

 It shows the use of the coax as a shorted line that is pulsed with an SCR pulse circuit similar to what Peterae and I have been playing with. I believe Grumpy was also going to test something out with the coax.

I am impressed with the high quality of the schematic and level of detail, especially in the series pass +200 volt regulator circuit, where  frequency compensation (R6 C4) around the TL431 regulator is used.

Main points are:

1) The use of a shorted end coax line  that overlays other windings that is pulsed by SCR T7 operated in avalanche mode. Reflected pulse in the line is clamped with diode KA204.
2) The use of logic chip (K1534na3) with gate delay to drive to the SCR (this does not appear to be an oscillator, rather it seems to be a debounce circuit for S1)
3) The use of ATX power supply 12 V for startup, then keep alive circuit Consisting of L4 and Br3 take over.
4) Coil L1 is driven from the secondary of the push pull oscillator with frequency adjust by R 1k.
5) Coil L2 is resonant with capacitor 50 OM (translate?)
6) An earth ground is used on L1 and L4.
7) Push Pull regulator built around TL494 provides 200 Volt regulated power supply for SCR pulser and square wave drive for L1
8 A 1:2 pulse transformer Tr1 provides impedance match to coax line.

SM seemed to use shorted end transmission line (lampcord) in his open TPU, and may have used this technique in other devices, as lampcord would make a transmission line.

The Spherics simple dual coil test was also a shorted transmission line.

Printed circuit artwork seems to be available for the device.

More info here:

http://www.liveinternet.ru/users/edward_lee/ and on OUdotcom.

Comments welcome.

PhysicsProf:
  I respect the research work of Itsu, and he has videoed a Dally replication:

http://www.youtube.com/watch?v=MQUciCy9p3A

and 2 days ago:
http://www.youtube.com/watch?v=utkIltw6WrU

Going to these vids will also provide links to similar Dally replication efforts.  I agree with ION that this work is intriguing.

Hoppy:

--- Quote from: ION on 2012-09-18, 14:37:16 ---I stumbled onto this schematic (posted on OUdotcom) and thought it be interesting for discussion.

It is someone named Dally's attempt at Kapanadze replication

 It shows the use of the coax as a shorted line that is pulsed with an SCR pulse circuit similar to what Peterae and I have been playing with. I believe Grumpy was also going to test something out with the coax.

I am impressed with the high quality of the schematic and level of detail, especially in the series pass +200 volt regulator circuit, where  frequency compensation (R6 C4) around the TL431 regulator is used.

Main points are:

1) The use of a shorted end coax line  that overlays other windings that is pulsed by SCR T7 operated in avalanche mode. Reflected pulse in the line is clamped with diode KA204.
2) The use of logic chip (K1534na3) with gate delay to drive to the SCR (this does not appear to be an oscillator, rather it seems to be a debounce circuit for S1)
3) The use of ATX power supply 12 V for startup, then keep alive circuit Consisting of L4 and Br3 take over.
4) Coil L1 is driven from the secondary of the push pull oscillator with frequency adjust by R 1k.
5) Coil L2 is resonant with capacitor 50 OM (translate?)
6) An earth ground is used on L1 and L4.
7) Push Pull regulator built around TL494 provides 200 Volt regulated power supply for SCR pulser and square wave drive for L1
8 A 1:2 pulse transformer Tr1 provides impedance match to coax line.

SM seemed to use shorted end transmission line (lampcord) in his open TPU, and may have used this technique in other devices, as lampcord would make a transmission line.

The Spherics simple dual coil test was also a shorted transmission line.

Printed circuit artwork seems to be available for the device.

More info here:

http://www.liveinternet.ru/users/edward_lee/ and on OUdotcom.

Comments welcome.

--- End quote ---

There has been two complete schematics posted and the one posted by ION looks to be a development on the other and more sophisticated but its not the circuit applicable to the Daly self-running video on OU.com which can be seen in the following link: -
http://realstrannik.ru/media/kunena/attachments/630/Dally2012.JPG

The components in need of alternatives are: -
Diode KA204 -  step recovery?
IC K1534NA3 - Probably a 4011B Quad 2-I/P Nand
KT315 - Any general purpose NPN?
T7 - 400V or 600v non sensitive gate power thyristor?
DR+R?

The L1 - L4 coil used in the Daly self-running video has been stripped-down and photos are posted in reply 14019. It may or may not suit this schematic but the build looks the same.

My understanding is that the three unlabelled caps across the input to the ATX PSU amount to around 10uF.

TR1 is a small ferrite toroid approx. 7mm dia x 4mm x 2mm.
TP is not iron cored as the symbol indicates. It has been translated as being a ferrite toroid taken from an ATX PSU, approx 4cm diameter.
The TL494 is a PWM oscillator chip which can be found in an ATX PSU.

I'm currently winding a L1 - L4 coil as I think this offering deserves replication.

The PCB applies to the other schematic - see link above.

Hoppy

ion:
Thanks Hoppy I was about to post that second schematic and make a few corrections to my earlier post, trying to absorb a lot in the last day or so.

Note that the first and second schematic shows a clamp diode or zener across the coax and resonator cap in series with the pulse transformer Tr1.

I believe these are important elements to be considered in testing the coax.

The diodes will clamp one half the ringing reflected wave and create DC current polarization in the line.

A shorted line reflects an inverted pulse!

The capacitor will facilitate ringing of Tr1 which will be reflected to the SCR allowing it to reset.

Here is a chart showing the effect on the open end of a shorted line as a function of wavelength.

Perhaps we can reverse engineer to find the 1/4 and 1/2 wave resonance of 5.9 meters of RG58 50 Ohm or whatever was used (75 Ohm TV grade?).

Hoppy:

--- Quote from: ION on 2012-09-18, 16:33:29 ---Thanks Hoppy I was about to post that second schematic and make a few corrections to my earlier post, trying to absorb a lot in the last day or so.

Note that the first and second schematic shows a clamp diode or zener across the coax and resonator cap in series with the pulse transformer Tr1.

I believe these are important elements to be considered in testing the coax.

The diodes will clamp one half the ringing reflected wave and create DC current polarization in the line.

The capacitor will facilitate ringing of Tr1 which will be reflected to the SCR allowing it to reset.

Here is a chart showing the effect on the open end of a shorted line as a function of wavelength.

Perhaps we can reverse engineer to find the 1/4 and 1/2 wave resonance of 5.9 meters of RG58 50 Ohm or whatever was used (75 Ohm TV grade?).

--- End quote ---

Thanks ION for posting the chart - very useful.

The co-ax is 50 ohm and is apparently from a LAN installation. the white sheath is unusual (usually black) but I think the cable used is probably old.

The co-ax on the stripped-down Dally coil is less than 5.9m.

Hoppy

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