Self running coil?

[gotoluc]

Preliminary results with the 4N35 opto :

Frequencies were swept (taking into account the 4N35 tolerance)
Different duty cycle has been tried

but...
In the best case, the cap drains very slowly.
but does not continue to fill as in previous results (first circuit without the 4N35).

Perhaps the setup or adjustments are not optimal...
but it seems difficult to arrive at the same result with the 4N35.

setup:
the 4N35 was added to trigger IRF640 Gate.
the rest of the circuit remains unchanged...
circuit with a 9v battery.
500 VDC - 240 MFD cap.
IRF640 mosfet
same toroidal coil

Thanks,
LightRider

Hi LightRider,

thanks for doing the tests and posting your result.

Do you have a scope?... if so, can you take a picture or post a scope shot of the gate pulse (without OPTO) that gave you the positive result and the pulse of the OPTO'ed one.

I would like to see what each form looks like.

Thanks for sharing

Luc

[mscoffman]

Preliminary results with the 4N35 opto :

Frequencies were swept (taking into account the 4N35 tolerance)
Different duty cycle has been tried

but...
In the best case, the cap drains very slowly.
but does not continue to fill as in previous results (first circuit without the 4N35).

Perhaps the setup or adjustments are not optimal...
but it seems difficult to arrive at the same result with the 4N35.

setup:
the 4N35 was added to trigger IRF640 Gate.
the rest of the circuit remains unchanged...
circuit with a 9v battery.
500 VDC - 240 MFD cap.
IRF640 mosfet
same toroidal coil

Thanks,
LightRider

Really, Good work LightRider...More or less what one would expect. It
would be nice if your could get your bulk capacitor up in value with
30WVdc. A used high res computer CRT might contain some "low ESR"
ones. At least to a couple of Kuf's seems to work well for gotoluc.
Don't forget the variable resistor to tune the drive level on the
IRF640's gate! See what that does.

---

If you could now wind a coil on a plastic wire spool somewhat like J.
Naudin had, that could slip over the magnets to near the toroid and
connect that into a Schottky bridge rectifier and some electrolytic
cap...driving the opto's output transistor...you just may have it! If
you could wind some wire then test the voltage then wind some more
to adjust coil's output voltage under load that might help. and/Or consider
a power conserving impedance matcher. Just kind of throw it into the
circuit temporarily at various points. To see if anything could benefit
impedance matching adjustments.

Don't burn yourself out though, we maybe chasing unity gain.
We just need *a little of claimed overunity* from the pickup coil!

:S:MarkSCoffman

[mscoffman]

@all

I can explain any of those scope shots in Coil test #11, #12
video except the weird waveform in scope shot #1.
just ask if interested.

---

@gotoluc

An interesting experiment would be to get some of Bedini's R60
welding rods to make a square metal core for pickup coil. Set one
end of the core parallel to the base of the plastic spool. Then stick
the magnet stack to that base and place the other end of the core
to near the toroid. The core mag circuit will conduct the magnetic
field up to the toroid. Nothing should happen because of the
strength of the magnets, but it still might.?.That is - no cutting
of lines or reduction of field strength = no signal from the pickup
coil.

:S:MarkSCoffman

[synchro1]

See attachment.  This is Kunal's flux toroid generator. Basicly, just a magnet inside the toroid with pulsed reluctance switches on either side.

[NextGen67]

@all

I can explain any of those scope shots in Coil test #11, #12
video except the weird waveform in scope shot #1.
just ask if interested.
<...>
:S:MarkSCoffman

MarkSCoffman,

Yes, please do so, as many of us will be interested about that -)

As for the Pick-up coil... Since Luc is back at square one for a while, In my opinion it is better to see what happens when he plugs in the STS2DNF30L (or a replacement one). We need to forget about the pick-up coil for a while, and figure out first if an mosfet with lower values (better specs) then the IRF640 will indeed also increase the 'charging up' effect of the Capacitor.

Reason being the IRF640 needs quite some energy to actually switch it ON, so *if* some of this energy triples through the circuit, it will be amplified and in such a way *could* be responsible for the cap 'charge up'... However a replacement mosfet (STS2DNF30L) for example which requires *way* less energy to switch on, hence would *also* cause *less* energy triple trough the circuit... Now *when* the STS2DNF30L results in a *better* cap 'charge up' then the IRF640 it can be argued leakage is not the cause.

On the other hand, if the STS2DNF30L shows a cap 'charge up' that is far lower then when he used the IRF640, it can be argued that indeed the hidden leakage could be responsible for the cap 'charge up'.

Sounds plausible ?

--
NextGen67