Akula0083 30 Watt Self Running Generator.

[mscoffman]

Operating Temperature range minimum at end of data sheet.
C  -      0 degree C
I   -   -40 degree C

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Digikey has these. I tend to think these are fairly old design.

Use TI:
http://www.digikey.com/product-search/en?vendor=0&keywords=TL494IN

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On the circuit I think LED array is the free electron receiver antenna.
You need to try to have exact components for everything of the schematic to the right of toroid L1
inductor.  This toroid separates RF environment of the control on left from power RF on the right.
What I would do is inject some small fake free electrons from a separate power supply on small
capacitors to the upper and lower part of the led array in controlled phase to the driving signal on
the FET for a tune-up. The TL494 is designed to slow down the rep-rate of an overunity circuit
rather than let energy build up in capacitors. The FET will not function well until TL494 comes
on power. The led diode near regulator signals HV I don't know by going on or off? The FET
will then function efficiently.

:S:MarkSCoffman

[Grumage]

Dear TinselKoala.

Welcome. 

Many thanks for the info on the driver.

Are you going to have a bash at this replication ??

I could think of no one more qualified. 

Cheers Grum.

[TinselKoala]

The TL494 is designed to slow down the rep-rate of an overunity circuit

Funny, I missed that in the data sheet. Guess I had better re-read it. I can certainly see why they want the "IN" version.... in Russia! But in Texas we don't see too much below-freezing weather. The hot end is more important to us, so we might need to use IN versions too!

DigiKey sells them for 73 cents apiece, either CN or IN versions, and you have to pay some shipping. Usually takes 3 days for a DigiKey order to arrive at my house.

http://www.digikey.com/product-search/en?v=296&pv16=6512&k=tl494&mnonly=0&newproducts=0&ColumnSort=0&page=1&quantity=0&ptm=0&fid=0&pageSize=25

So even though they are a few pennies more expensive each from thaishine, he pays the shipping, but with DigiKey you pay the shipping.

[TinselKoala]

Dear TinselKoala.

Welcome. 

Many thanks for the info on the driver.

Are you going to have a bash at this replication ??

I could think of no one more qualified. 

Cheers Grum.

Thanks, but no, I'm not going to be doing it, for a couple of reasons. (This could change, though.) However I can tell you that the basic oscillator section is virtually identical to just about every 494-based SSTC that I've seen including my TK2. There is a very easy way to make it "self-triggering" so that it seeks the resonant frequency of whatever it is driving, and maybe the Akula circuit above already does that. But I have no idea what is happening in the Akula circuit past the oscillator section. I'm pretty sure it will light the LEDs as long as it is getting power, but after you open the switch... I think it will go dark.

But when someone does build it, I'd love to see the results. I think that there are some "red herrings" in the design that don't really matter, but that's an experimental issue and I hope someone does the right experiments to find out.

ETA: Heh... checking my secret post-Apocalypse stash, I find that I have 2 ea. TL494CN chips and a handful of IRF3205 mosfets on hand. That's helpful indeed.

[TinselKoala]

The led diode near regulator signals HV I don't know by going on or off? The FET
will then function efficiently.

Hmm. The 7812 regulator supplies the chip's main power at pin 12, and it also supplies the collector current for the VT2 NPN transistor that is used to drive the 3205 mosfet (wrong symbol there btw)  in the low-side switch arrangement switching L1. The LED near the 494 is in the circuit to both of the emitters (9 and 10)  of the open-collector NPN output stages of the 494. So the LED will come on when the 494 is operating. The primary output of the 494 is through pin 11, to the gate of the VT2 transistor, where it works by grounding and ungrounding  the collector-base part through the 494 (pins 10 and 11 are the collector and emitter of one of the 494's output NPN transistors.) Pin 8, the collector of the other stage's output NPN, is apparently not used.

I think.  See the Functional Block Diagram in the 494 datasheet.