100 watts output with 60ma input

[joellagace]

Yeah sometimes youtube detects links as comment spam.

[x_name41]

it all depends on the Q factor of the coil and its inductance, the lower ohmic resistance and high inductance it has the better it will work or something like a rough equivalent of a superconducting coil, and all this at the cost of increasing the mass and dimensions

[SkyWatcher123]

Hi all, Hi joellagace, yes, I have changed the oscillator circuit that charges the capacitor for the dump circuit.
It is now the stingo oscillator circuit, which by default, gives the shortest possible on time pulse or very low duty cycle, like 1% on time I've heard.
This means much better efficiency and radiant production from a given coil, need to test some other large coils, as i'm using 100 feet of 18awg. speaker wire in flat pancake style, so that makes it a 200 foot coil length, because each wire of the pair, is in series.
Maybe I'll get another 100 foot roll and make another pancake coil and that will give a total of 400 feet coil length.
The stingo circuit is a little finicky, it needs the right PNP-NPN combo to oscillate correctly.
peace love light

[Kangsteri]

It might be more simple with PNP & NPN transistor pair, like SkyWatcher123 mentioned. I'd like to see the schematics for that too? But i really like this option to test different voltages for the coil. Here is a circuit I might try some point:
https://i.imgur.io/e6sZtkH_d.webp?maxwidth=640&shape=thumb&fidelity=medium

Here is some of my reasoning for it:
So i wanted to avoid the inverter but keep it isolated. To keep the voltage stable with 5.5 – 32v, it's stepped down with LM7805 Buck module. It's way more officiant than 7805 regulator.

Then it's splitting to isolation modules B0505S-1W (5V) for the oscillator and B0515S-2W (15V) for the coil.  It's possible to test different voltages with different modules. B0505S-2W is 5V, B0512S-2W is 12V and B0524S-2W is 24V. You just need to put different capacitor for the output too, to reduce voltage ripple (these values are on the datasheet). These isolation modules are relatively cheap on AliExpress. More voltage is less resistance. But the battery might like it more with 5V and it would consume less power. It's possible to get even more voltage, by adding simple voltage multiplier circuit (diode and capacitor pairs).

The switching for the transistor can be done with 555 signal generator module.

Resistor is used to protect the transistor, but it might not be needed with low voltage.

2N3771 should be able to handle these wats. It's a lot cheaper than the NTE181.

The coil seems to be one of the key ingredient with all self oscillating systems. It needs to have equal or more capacity than the battery. So mass is important. It needs to be air core, cause any metal, even magnesium zinc (Mn-Zn) will slow down the switching too much. Litz wire would be the best, specially silver coated But it's expensive. High frequency voltage is collected with surface tension, so more surface is less resistance. Additional trifilar pick up coils in series will collect more energy too. There seems to be something with the resonation of 1:3, 1:6 or 1:9 on additional pick up woundings...

The outputs need to be rectified. Ultra fast UF4007 or MUR460 should perform well.

I suspect that it would be best to use Low pass filter (Pi / EMI / CLC) to charge capacitor. Rather than the voltage spikes straight to the battery. It needs iron core toroid (yellow white, yellow, black, etc.) choke, with bifilar thick wire coils to equalize the voltage spike difference, to slow down the frequency and taking some charge. Ceramic capacitor will remove the biggest spikes. Smoothing capacitor will collect and dampen the energy back to DC. The smoothing capacitor needs to be higher voltage than peak to peak is. Variable output resistor will determine the output voltage. It will work better if the output can be adjusted, cause the battery and possible load will cause resistance too. Values for the output filter are just questimations from the top of my head, based on example circuits. I'm not loony enough to know the math on these, I'm mainly interested on the consept and principles. Any help or other suggestions would be nice.