Earl's Corner

[tao]

Hi,

Please see the attached PDF update showing test results of a 74AC74 pulse circuit.

Regards, Earl

Concerning your question: "The question is whether a voltage swing of 12V going to two, opposite coils is sufficient?"

According to Milan's setup at this page: http://www.keelynet.com/energy/milan.htm
He is using only 10V and via his open-ended Tesla/Avramenko hybrid setup, he is getting some impressive voltages built up...

Now in regard specifically to the TPU and it's wiring, I would still have to be asking the same question you did, maybe Bob knows ...

[Earl]

@Tao @All

I will also be trying the FET driver that is designed for quickly charging a capacitive load of 1 to 2 nF.
If there is a load of only very low pF the outputs should have fast rise and fall times.

If the FET driver can take 25V Vdd, then the output would be 50V p-p differential.  If the shock to the environment (aether ??) increases as the square of the voltage, then 50V p-p would give about 16 times the bang of 12V p-p.

Just for fun, I will also be trying a multi-filar balanced to balanced HF step-up transformer to see if it is possible to step up the voltage without degrading the pulse waveform too much.

One thing I forget to include in the PDF was that the output waveforms hardly changed when I connected by entire body via a metallic object in my hand to the output.  This means a lowly CMOS F/F has sufficient output drive to charge & discharge my body capacity with rise and fall times of ~ 2ns.

Therefore a 74HC / 74AC F/F has more than enough output drive capability to excite toroid coils with low ns impulses, at least open-ended coils.

Regards, Earl

[Bob Boyce]

One thing I forget to include in the PDF was that the output waveforms hardly changed when I connected by entire body via a metallic object in my hand to the output.  This means a lowly CMOS F/F has sufficient output drive to charge & discharge my body capacity with rise and fall times of ~ 2ns.

Therefore a 74HC / 74AC F/F has more than enough output drive capability to excite toroid coils with low ns impulses, at least open-ended coils.

Regards, Earl

Body capacity at low voltage is not very much of a load. Essentially unloaded operation will not be quite the same as operating in and perturbing the near field of an active HV bias potential field.

This reminds me. A couple of days ago one of the other replicators called. Driving the primaries single ended with TC4420 drivers caused them to fail in the presence of the HV bias potential field. He said this did not occur with the HV bias potential turned off, unless loaded with 330K resistor.

Bob

[Earl]

Hi Bob,

What happens in a HV bias field is anybody's guess; that is why it is necessary to build, test, and measure.
There is a funny saying: "In theory, practice and theory are the same; in practice they are not".
And where we are going there is little practice or theory so most likely there will be a lot of learning and surprises.
Along with a trail of burnt semiconductors.

It would be nice to know if the FET driver failure is on the input or output part.  Even on identical part numbers, manufacturers use different circuits and processes.  And for non identical parts, the input and output circuitry is vastly different.

There is one universal circuit add-on that can protect inputs and outputs where the swing is between Vss and Vdd.  I attach this simple and effective circuit.

Regards, Earl

One thing I forget to include in the PDF was that the output waveforms hardly changed when I connected by entire body via a metallic object in my hand to the output.  This means a lowly CMOS F/F has sufficient output drive to charge & discharge my body capacity with rise and fall times of ~ 2ns.

Therefore a 74HC / 74AC F/F has more than enough output drive capability to excite toroid coils with low ns impulses, at least open-ended coils.

Regards, Earl

Body capacity at low voltage is not very much of a load. Essentially unloaded operation will not be quite the same as operating in and perturbing the near field of an active HV bias potential field.

This reminds me. A couple of days ago one of the other replicators called. Driving the primaries single ended with TC4420 drivers caused them to fail in the presence of the HV bias potential field. He said this did not occur with the HV bias potential turned off, unless loaded with 330K resistor.
Bob

[Earl]

Hi All,

here is the latest information, including a circuit schematic for a rotating-field pulser.

Feedback welcome.

Regards, Earl