Panacea-BOCAF 2nd MRA replication -COP =8

[poynt99]

Ash, your higher wind results sound about right.

What I'm curious about, is what if the overall circuit resonance was arranged to fall on the same frequency as the piezo's natural resonant frequency?

If you haven't already, I'd sweep the piezo alone and see at what frequency it "sings" the loudest..i.e the fm here: (http://www.americanpiezo.com/piezo_theory/resonance_frequency.html). Then try to design the transformer windings so that the overall resonance is at the same frequency.

If resonance is the key, maybe it would work better this way.

.99

[ashtweth_nihilisti]

poynt99, thanks for the info, in the document you will notice Norm talk about how the golden mean ratio is critical in the Trafo winding and to always keep it in mind when designing . It strangely also does not produce the same power with out the 1.618 ratio, maybe this can explain the pyramids as tapping a resonant frequency..hmmm

Edit, whoops sorry missed the Q, check out the PDF, the winding and resonant  frequency is listed there 

Ash

[pese]

Gustav, go get the same LEDS and signal Gen and light up 20 LEDS. I know your wrong, but i dont discuss this, read my prior posts.

Ash

I seen only the first one (lesson) if this was new published (and edit my questions)
If you have now published the true output in watt or mW , and are they not fishing in datasheets, than your experiments shown more seriosly. I will seen in future ..
Gustav Pese

P.S.
I write this because ALL 20 Leds can also lightning (bright) with only 20mA all together, in all total. Nobody must wast the time to recognize that with own experiments.

One more. We cant see, that you are using the old type 20mA Leds, not the newone that are
over 10 years to buy normally in shops the usin 2mA maximum and light also fine with less than 1mA. I belive that you will not "do" that. But any-else ?  Better in, any way, is to se the flowing currents and power with test-equipments

[poynt99]

poynt99, thanks for the info, in the document you will notice Norm talk about how the golden mean ratio is critical in the Trafo winding and to always keep it in mind when designing . It strangely also does not produce the same power with out the 1.618 ratio, maybe this can explain the pyramids as tapping a resonant frequency..hmmm

Edit, whoops sorry missed the Q, check out the PDF, the winding and resonant  frequency is listed there 

Ash

I was thinking something along the lines of this:

- The piezo element has it's own resonant frequency--somewhere in the ultrasonic region, probably around 40kHz.
- The combined LC resonance of the piezo and transformer inductance is at some optimum frequency.
- The magnet material itself will have its own specific resonant frequency (magnetostriction) which can be calculated by its dimensions if it is some regular form, which in this case it is not. It could be determined however by wrapping a heavy gauge low turn coil around the magnet and sweeping it to find the frequency at which it "sings" the loudest.

If resonance is the key to ou, then aligning the electrical and mechanical resonances in the unit should produce the best results.

Norm seems to have done something along these lines, but I'm curious how he determined his magnet was at a 8kHz resonance.

Ash, it is possible that in your first tests at ~70 kHz, you were operating the device at a harmonic of the piezo resonance, and now at 17kHz, you are at a sub-harmonic. Perhaps 32-35 kHz would give better results? Notice that Norm and Joel were using 32kHz.

Just some thoughts.

.99

[hartiberlin]

Probably the best output could be got,
if the piezo is driven at its own resonance frequency
and the transformer resonance frequency is matched to it.

So try to measure the resonance frequency of the 2 parts alone
and then adjust the resonance frequency of the transformer with
an additional variable cap trimmer to get to the same
resonance frequency as the piezo has.

Then this should give a very nice output.

Regards, Stefan.