RobertDepelteau circuit

[RobertD]

It's probably a good idea to push the ignition coil as hard as it will take it. The higher the voltage the better the yield.

Now I found out microwaves use 3kv not 18kv so I have to modify the low voltage to get 110v .
As is I'd get 1500v which is too much.

[sm0ky2]

Always looking for better yields.
Once an idea is put in the public domain it's no longer patentable.

That's not true.
You must license to be freely used
Or place the technology into commercial use.


Otherwise anyone can patent it, and it is then up to you
to spend the lawyer $$ to try and overturn their patent.
If you wait too long, it can be construed as uncontested,
and they may end up keeping their patent.




Also Robert:  please understand the automotive coil is
NOT A TRANSFORMER!!!
At least not in the sense that we commonly think of.
The ground side is joined together inside the casing.
And because of this, it doesn't work the same in reverse.

Some actually have 2 terminals at the HV output,
which can trick you.
Check the continuity between both ground terminals!

I was forced to learn this while trying to step-down static electricity.


Another point is the break-down voltage of the oil inside them.
two in series might be ok, as they overshoot the mark to prevent
internal arc-over.
However, 3+ may lead to internal short circuit or sparks between
turns of the coils.

[sm0ky2]

Now I found out microwaves use 3kv not 18kv so I have to modify the low voltage to get 110v .
As is I'd get 1500v which is too much.

That actually depends on the microwave design.
The best way to think about it is like a voltage-doubler.
In this manner you can take 2x the value of the capacitor.


For instance if the capacitor is 2800V then we know the circuit
is also 2800V, and when these two are added together, we have
5600V through the magnetron.


Now, this will confuse you when you examine the transformer
because your calculations will show a lower value.
You have to understand that in this circuit the voltage changes
every 1/60th of a second.
The "peak" voltage is about 40% higher that what we think it will be.
the equation generally used takes 1.414 as the accepted value.


For this reason, the transformer fed with 110V
is actually a 2,000V transformer. (in the example of the 5600V circuit)


different microwave ovens have different circuits.
there are "industry standards", but it is not Law.
Because of patenting and availability of components, many different designs
are used.
It is best to look at the specific design of the oven you took the magnetron and
other components out of.

[RobertD]

Now I found out microwaves use 3kv not 18kv so I have to modify the low voltage to get 110v .
As is I'd get 1500v which is too much.

I'll just have to measure it.
Yes dear the ignition coil is not a transformer.

[RobertD]

I'll just have to measure it.

In this circuit the frequency is whatever I make it. It is driven by the computer. I'll set it for resonance of the high voltage coil. I think that would work. I think I fried my frequency generator connecting it to a driver transistor grounded to the circuit. I have all the grounds in common.