Self running coil?

[mscoffman]

I couldn't find a reference to the spx- part number that both
Naudin and Steorn seem to use for their optoisolator. I estimate
this part has a fairly high data rate therefore good signal
reproduction on the output side. One could see a data type
led coupled to a data transistor by a short segment of optical
fiber making a very low input to output capacitance for AC -
high isolation. Someone with access to these other opto parts
should find a good one for a 40KHz square wave, so everyone
doesn't have to purchase suboptimal components. Don't
forget that Fourier Transform Decomposition says that
squarewaves contain higher frequency components.

Also some opto's bring out their output transistor base to a pin
often for connecting a 100Kohm resistor to the output collector...
That resistor might help waveform symmetry on slower speed
opto parts.

---

Note All: that I think Gotoluc has sold me that a variable resistor
is needed in series with the mosfet gate to carefully trim the
drive power for overunity operation. This would substitute
exactly for his signal generator square wave level control setting.
Especially for use with an opto. Once it was set for optimal it
could be left as is. One of those small blue box shaped plastic
10turn trimpots would work. My calculations show that a 5K
variable resistor (not a fixed res.) works for the IRF640. This
is for gate series (not voltage divider) operation to conserve power.

:S:MarkSCoffman

[gyulasun]

So, that means we are left over using the TC4804-05 opto MOSFET driver in itself (or similar types, this was the first one coming in mind).

It has a wide enough range for Frequency (up to 1.2Mhz), but you might want to take a look at the specs in the data sheet if there is no other obstacle... It's maximum voltage is also 20 volt.

The data sheet is attached in my message about the TC4804 earlier.

--
NextGen67

Hi,

In fact it was the second time I have seen the TC4804 or 05 suggested to Luc, the first one was written by Peter yesterday at http://www.overunityresearch.com also data sheet attached there.

The 20V max voltage might be a limiting factor on using this type, though it possibly could be solved if were needed.

Of course the type of the opto couplers, opto drivers, or opto relays is open to choose, there surely are devices out there which may be even better than the TC4804 family.  It needs searching and studying. 
Question also if they are the off the shelf or to be ordered and their price.

rgds, Gyula

[HarryV]

Harryv
This is not a boost converter as none of them will recharge the input source(cap) while being operated. Ive tried.
And you wont find any dc/dc converters with magnets on the coil core.  ;]

Mags

This was his response:

> "This is not a boost converter


I said it was a boost converter _without a load_.

> as none of them will recharge the input
> source(cap) while being operated. Ive tried.

This is because he hasn't tried removing the load. If you do, in the
course of one oscillation cycle, the input source first sources
current, and then sinks current. Note there is a hidden component in
the circuit which is important to understand where the inductor's
current flows to and from in this no load operation, that's the
MOSFET's output capacitance. The IRF640's antiparallel diode is
another hidden component which plays an important role, it prevents
the drain voltage from going below zero.

also look at the circuit diagram under operating principles

http://en.wikipedia.org/wiki/Boost_converter

the capacitor seems to be placed differently.

[gyulasun]

I couldn't find a reference to the spx- part number that both
Naudin and Steorn seem to use for their optoisolator.

Hi,

IF you mean this Naudin Orbo setup:
http://jnaudin.free.fr/steorn/images/steornv3b.jpg   where he uses a black 'box' attached to the side 'wall' of the rotor between the two toroid cores, then it is an opto interruptor where the light coming from a LED and going to control an opto transistor is interrupted or not by a small piece of non-opac rotor finger.  What Naudin used for this is included here in the Steorn Orbo forum by member haithar:
http://www.overunity.com/index.php?topic=8411.msg228295#msg228295

Also some opto's bring out their output transistor base to a pin
often for connecting a 100Kohm resistor to the output collector...
That resistor might help waveform symmetry on slower speed
opto parts. 

While I agree with this method, it uses some amount of valuable current from the electrolytic puffer cap unfortunately.

rgds, Gyula

[HarryV]

@Anyone
I asked my 'advisor' this:


> But the capacitor looks like it is in the wrong place to be a booster
> converter with or without a load.
> compare photo 2:
> http://tinyurl.com/ycw4xm4
>
> with operating principles
> http://en.wikipedia.org/wiki/Boost_converter


his response:

The capacitor on your photo 2 is in parallel with the battery so it's
part of the converter's input supply. The capacitor in the operating
principles diagram of the wikipedia article is the converter's output
capacitor, which might as well not be there in steady state is there
is no load (once charged it just stays charged at a high voltage, and
the Boost's diode never conducts-- so the diode might as well not be
there either). So everything to the right of the switch in the boost
converter diagram could be removed in no load condition, that's why I
say the circuit operates like a Boost converter without a load. Which
explains why it steps up the input voltage, that's what Boost
converters do.


so is he correct in saying this is a boost converter without a load?