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Most of the folks here struggling with resonance should just build a small pair
of Tesla coils and experiment with those to get a handle on resonance.
Basically in my opinion there are two ways to do it, wind the coils a bit long
and tune the length of the coils or just wind the coils to be what sounds reasonable
then tune them with capacitors. Unless a capcitorless tune is wanted then I
don't see why the big fuss, if tuning with capacitors anyway, you just don't
want to use 400 nF to tune three turns to a reasonable frequency, the lower
the capacitance on the L2 the better.
The L1 will always need capacitance because it is much less inductance and
helps to be tuned to the same frequency as the secondary.
Lets say you wind an L2 to be 14 uH and a L1 to be 1 uH then if 47 nF is
added to the L2 it will have a resonant frequency of 196.2 Khz, so to match
that the L1 needs to have 655 nF. But in practice when the coils are put
together and a ground connection is made things change a bit as pointed out
by Gyula, this is well known.
They call this stuff tuned circuits for a reason, they must be tuned to the
desired frequency and to the resonance effect desired.
Tesla explains all of this many times and what Tesla says does not jive with what Don Smith says.
Once one learns how to achieve resonance, what is required and what must
be done, then it's just a matter of routine.
Get a Function generator and an oscilloscope rated for the frequencies you
want to use, with that a person can tune a setup to very close to frequency
they want with resonance on both L1 and L2, resonance on L1 is not
absolutely necessary but it helps in my opinion to improve output a lot, any
increase in amplitude on the primary will be multiplied by the secondary, but
that is just amplitude not energy.
Not one person has convincingly shown more energy out than in with a Don Smith setup.
A word of warning, using this kind of circuit produces various problems for
other electronic equipment in close proximity, Tesla coils do that, a powerful
Tesla coil can render sofisticated electronic equipment totally useless or even
dangerous.
I'm not a radio ham but I can build and tune any transformer to resonance
within the frequency limitations of my equipment. It actually very simple once
the hard yards are done. But no one can do the hard yards for anyone else.
To build and use resonant devices you must understand resonance in a
practical way. Not so much in a books way. Just cutting some wires to a
certain length will never work unless by blind luck or very clear instructions
are given and followed to the letter.
Cheers
of Tesla coils and experiment with those to get a handle on resonance.
Basically in my opinion there are two ways to do it, wind the coils a bit long
and tune the length of the coils or just wind the coils to be what sounds reasonable
then tune them with capacitors. Unless a capcitorless tune is wanted then I
don't see why the big fuss, if tuning with capacitors anyway, you just don't
want to use 400 nF to tune three turns to a reasonable frequency, the lower
the capacitance on the L2 the better.
The L1 will always need capacitance because it is much less inductance and
helps to be tuned to the same frequency as the secondary.
Lets say you wind an L2 to be 14 uH and a L1 to be 1 uH then if 47 nF is
added to the L2 it will have a resonant frequency of 196.2 Khz, so to match
that the L1 needs to have 655 nF. But in practice when the coils are put
together and a ground connection is made things change a bit as pointed out
by Gyula, this is well known.
They call this stuff tuned circuits for a reason, they must be tuned to the
desired frequency and to the resonance effect desired.
Tesla explains all of this many times and what Tesla says does not jive with what Don Smith says.
Once one learns how to achieve resonance, what is required and what must
be done, then it's just a matter of routine.
Get a Function generator and an oscilloscope rated for the frequencies you
want to use, with that a person can tune a setup to very close to frequency
they want with resonance on both L1 and L2, resonance on L1 is not
absolutely necessary but it helps in my opinion to improve output a lot, any
increase in amplitude on the primary will be multiplied by the secondary, but
that is just amplitude not energy.
Not one person has convincingly shown more energy out than in with a Don Smith setup.
A word of warning, using this kind of circuit produces various problems for
other electronic equipment in close proximity, Tesla coils do that, a powerful
Tesla coil can render sofisticated electronic equipment totally useless or even
dangerous.
I'm not a radio ham but I can build and tune any transformer to resonance
within the frequency limitations of my equipment. It actually very simple once
the hard yards are done. But no one can do the hard yards for anyone else.
To build and use resonant devices you must understand resonance in a
practical way. Not so much in a books way. Just cutting some wires to a
certain length will never work unless by blind luck or very clear instructions
are given and followed to the letter.
Cheers
stayed tuned...
here !
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