Kapanadze Cousin - DALLY FREE ENERGY

[itsu]

The pot on that board is the pulse width adjustment, most probably. Unfortunately none of the schematics on that link (photos) actually describe the board's circuit. But the timing components that set the frequency of the 494 are the usual ones : Ct and Rt, which appear on the board as C1 and R6, connected to pins 5 and 6 of the 494. So yes, you can change the frequency of the board.... "simply" by replacing these parts with different values. These SMD parts are smaller than a grain of rice, so good luck. You could just remove them from the board and bring wires out to a socket or screwterminal where you could substitute different (and easier to handle) resistor and capacitor values to change the operating frequency.

Thanks Tinselkoala, 

i think its doable with a magnifier glass, then  "remove them from the board and bring wires out to a socket or screwterminal where you could substitute different (and easier to handle) resistor and capacitor values to change the operating frequency".

Itsu

[TinselKoala]

This is how I'm interpreting those schematics:

The "PWM Pulse Output Section" does seem to show the output side of the unit, the part on the right outlined with a red box. The transistors are the ones marked " Q6" to "Q9" on the left edge of the board. This schematic also shows the timing components Ct and Rt on the left side of the schematic.

The "Electric Fish" shows how a 494 can be used to drive an H-bridge of IRF3205 mosfets (with a driver stage in between) which then powers a stepup transformer to give a HV output for stunning fish.

The third diagram with the yellow square representing the 494 is very similar to the "electric fish" circuit but with different frequency and voltage, for use as a DC to AC inverter.

The final diagram looks like it's using the 494 as the oscillator in a DC-DC converter with a bipolar DC output.

If you've already built 494 oscillators for your projects I don't know why you'd want to try this unit. It doesn't appear to offer anything new, over the 494-based circuits you've been using. Of course, it's very inexpensive and just for that reason it might be something you could use, modify, experiment with.

[Hoppy]

Not sure Hoppy.  My first guess is the surface area. That's why Ruslan use the Litz wire  (welding cable)?  , That's maybe why Tariel was using many wires? forming Litz wire too.  Many wires, lots of surface area. Just guess.

I think that this is a crucial thing to establish if we are to have any chance of understanding how this contraption functions. Ruslan definitely uses welding cable (I checked the spec from a close-up shot in the video) and I think so does Tariel. This is not Litz in the strictest sense, just multi-strand for flexibility. I too hazard a guess that surface area is most likely important for Ruslan's device, although I'm not so sure that this is the case for TK's device.

[Hoppy]

Thanks Tinselkoala, 

i think its doable with a magnifier glass, then  "remove them from the board and bring wires out to a socket or screwterminal where you could substitute different (and easier to handle) resistor and capacitor values to change the operating frequency".

Itsu

You consider it usable then Itsu. 

[NickZ]

Aha,   ok,  i misunderstood.

I don't think the inductor (bifilar) coil will change when going to 24V, at least i did not change anything on my grenade / bifilar coil when i went to 24V.
It should stay at the specific length, like half the grenade coil length, meaning 17m or so.
When you wind that over the lower part of the grenade, you should have 3 layers of 24 turns or so.
Having 2x 12 turns as inductor/bifilar coil looks very short (lengthwise) to me and will cause a high resonance frequency when using 1  0.47uF cap in series (40Khz??).

Concerning this:

how about something like this:

http://www.ebay.com/itm/TL494-KA7500-DC-9V-25V-Driver-Board-DC-DC-Converter-Inverter-Boost-Module-PWM-/131586554657?hash=item1ea32b7b21

Guys, could this be something for Nick to order?   Not sure if its frequency is adjustable (enough).

Regards Itsu

  Itsu:  My frequency reading at the 0.47uf cap was about 25Khz, not 32Khz as it was previously, nor 40Khz as you had suspected.  Although now it dropped to 21khz, after I added two additional tuning caps to the 0.47uf wima capacitor, and used the magnet in the yoke, and ferrite in the grenade to adjust for the highest gain, and bulb brightness.
So, maybe I should leave the resonator coil as it is, for now? Or perhaps add one more layer of 12 turns to the induction (resonator) coil, then another if needed?

  We know that Ruslan was running his earlier device at 27.3Khz, (at the 0.47uf cap), on his previous build, and his Kacher was running at about 1.7Mhz. Which is doable for me, if I re-adjust my my current set of frequencies.
  Don't you think that I should try to obtain those same running frequencies, and see what happens there?

  Itsu, thanks for the link.  I've seen many of those "el cheapo" TL494 boards on the market, and I'd be into trying them out.
The price is right. And I probably could not make anything better, myself. Especially at those prices.
  But, if someone replicated the allegra board design, so that it can be tested, and if found to work as it should, then they could be sold to any of us interested in trying it out. That may be the best way to go.   Some one like Oleg, perhaps, or any of us members here.