Graham Gunderson's Energy conference presentation Most impressive and mysterious

[gotoluc]

I'm reposting Gotoluc's scopeshot along with the Gunderson scopeshot. As you can see Luc's shot is virtually identical to the "input" traces on Gunderson's shot.

And he achieved it with a much simpler circuit (but using a FG for the clock instead of making an oscillator out of logic chips.)

Now, I'd like to see what Luc can get for an output!

Good morning TK and all


I have a question for anyone that knows. Has it been confirmed if Graham is doing the power measurements before the H-bridge or is it done after it?


Thanks


Luc

[TinselKoala]

Morning TK,

Try this:

Hey, thanks, that actually works! I've marked the pinout on your photo, and wired up U7 to match. Now the circuit does not need an outside clock signal, and the previously non-functional pot now controls the frequency. Now we just need to play around with the timing capacitor and resistor values to get outputs that are in the right frequency and duty cycle range. (I doubled the value of the frequency timing capacitor already but need to slow it down even more I think.)

In the scopeshot below the Dark Blue trace is now the Pin 12 output of the oscillator U7.

Thanks for looking that up for me! I had started looking through example circuits for the 74123 but stopped for breakfast and a beer before I got that far.

(But does it correspond to what is shown in the photos of Gunderson's board?)

[TinselKoala]

Good morning TK and all


I have a question for anyone that knows. Has it been confirmed if Graham is doing the power measurements before the H-bridge or is it done after it?


Thanks


Luc

I think he is measuring "input power" as input to the transformer, that is, between the H-bridge output and the input to the transformer.
There has been some discussion on this matter. It is my opinion that the input power should be measured as input to the power supply to the H-bridge and should also include the inputs to the other necessary power supplies, but obviously not everyone agrees with me.

[Spokane1]

Dear All,

Here is our logic diagram to date including today's and yesterday's review and work by TK.

Spokane1

[k4zep]

Hey, thanks, that actually works! I've marked the pinout on your photo, and wired up U7 to match. Now the circuit does not need an outside clock signal, and the previously non-functional pot now controls the frequency. Now we just need to play around with the timing capacitor and resistor values to get outputs that are in the right frequency and duty cycle range. (I doubled the value of the frequency timing capacitor already but need to slow it down even more I think.)

In the scopeshot below the Dark Blue trace is now the Pin 12 output of the oscillator U7.

Thanks for looking that up for me! I had started looking through example circuits for the 74123 but stopped for breakfast and a beer before I got that far.

(But does it correspond to what is shown in the photos of Gunderson's board?)

Hi TK

Glad to be of help, used those chips many years ago in some ultrasonic tracking circuits and remembered it would self Osc. Looked it up in some application notes.   Your doing some GREAT work there! 
I too get totally engrossed in circuits sometimes and can't sleep and end up plumb squirreley!  Have to pace myself or my heart kicks into AFIB and it slows me down for
a day or two!

I have found out a bit more about the Blue output pulse that stays high during the rest time.......I'll post waveform and discuss it a bit in another post.

Luc steered me to this site:  http://teslaenergysolutionsllc.com/product-category/solid-state-relays/     It has a couple SSRelays that look very much
like or similar to what GG uses.  For your consideration.

Ben