Re: New Oscillator

Hi

I have changed the capacitor and completed the power supply.

I found I could only get 16 watt out of the oscillator with the 50 volt
supply. The tube of low pressure hydrogen was put in place and the and the
power increased to 16 watt. No ionisation glow was observed. I will try
again after dark as I have no blackout.

I tried with 10^-5 Tor hydrogen, 10^-7 Tor hydrogen and 10^-8 Tor hydrogen.

The tubes 10^-7 Tor and 10^-8 Tor became warm but the 10^-5 Tor did not seem
to get warm.

--
Chris.
London,
UK.

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"Chris" <ns_cjrs@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:EUkXk.361$aj7.88@xxxxxxxxxxxxxxxx
I found the tuning capacitor was failing because it was used beyond its
rated AC potential of 700 volt. So I've ordered 4 3300 pF to replace the
680 pF. This will also shift the frequency down as I also want.

I'm going to put a circuit breaker to protect the circuits from over
current.

I've nearly finished the 50 volt PSU now, I'm awaiting parts to be
delivered. One won't come till friday.

The object it too power an oscillator which I hope will ionise hydrogen
and initiate fusion. I think I need 1000 watt but I'm trying a lowe
pressure and lower power. My oscillator is only 9 watt but this PSU should
bring it up to 36 watt. The potential across the tube will rise to 2500
volts RF. That is 25000 volt/meter This should break down the hydrogen
gas.

Inside the coil Poyntings vector will be 36/4.9E-3 = 7346 watt/m^2 so the
E-field of the waves propagated towards the axis will be given by
<S>=e0c2E^2 so E^2=<S>/e0c/2 =<S>/132.75 so E=sqr(7346/132.75)=7.43
volt/meter. m f px7.43=10000x7.43 = 7430 eV. It might ionise hydrogen at
10^-7 Tor

These collisions may cause fusion.

--
Chris.
London,
UK.

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"Chris" <ns_cjrs@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:dn9Xk.11$4m6.2@xxxxxxxxxxxxxxxx
I'm new building a new power supply to increase the power to 36 watt by
inceasing the supply potential to 50 volts.

--
Chris.
London,
UK.

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"Chris" <ns_cjrs@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:QMBWk.32102$nT6.5254@xxxxxxxxxxxxxxxx
The glass of the tube is Pyrex it should be a non-conductor and will not
get hot in the rf field. The coil does not get warm without the tube so
I assume the gas is conducting a little bit but not enough to glow
visibly. The transistors get warm but warmer with the tube in place.

I just need more power.

The parts for the 50 volt power supply should come tomorrow and I should
be able to increase the output potential from 0 volt to 50 volt
smoothly.

I'm going to put a current limiter of 10 amp on it. Hopefully this will
not blow up at 50 volts.

I'm hoping to obtain 36 watt. With the transistors disipating another 36
watt that is 72 watt from the power supply so only 1.44 amp. It will
probably take about 3 amp judging from experience.

I'm hoping 36 watt will be enough to ionise the hydrogen. If not I will
have to build another oscillator.

I'm thinking of using a commercial 1000 watt linear amplifier with a
tuned circuit and a feedback loop. Like a Hartley oscillator with the
amplifier instead of the valve. After all a valve is an amplifier and a
linear has just one main valve.

Chris.

Chris.

--
Chris.
London,
UK.

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"Interested Lurker" <invalid@xxxxxxxxxxxxxxxxx> wrote in message
news:492a4e7a_1@xxxxxxxxxxxxxxxxxxxxxxxxx
With regard to the tube getting warm, would this be local heating from
the coil or possibly metal content in the glass used for the
manufacture of the tube dissipating some of the oscillator power?
Roy,
Preston UK
"Chris" <ns_cjrs@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:WY%Vk.8544$XQ2.5842@xxxxxxxxxxxxxxxx
I increased the potential of the power supply from 12 volts to 30 volts
and the output power has increased to 8 watt. The average current is
still only about 1.2 amp so the power dissipated by the transistors is
therefore 36 watt. That is 22 % efficient. The transistors are slightly
warm and the current is not increasing.

The hydrogen tube (pressure 10^-8 Tor) is still not obviously visibly
ionizing. When I took the hydrogen tube out of the coil I noticed that
the tube was warm. The output power dropped to zero and the current
increased to 3 amps which was limited by the current limit.

I tried the 10^-7 Tor tube and did not notice any glow.


--
Chris.
London,
UK.

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"Interested Lurker" <invalid@xxxxxxxxxxxxxxxxx> wrote in message
news:49265dfb$1_1@xxxxxxxxxxxxxxxxxxxxxxxxx
1.5 watts from 2 100w transistors that get warm? Something badly
amiss with your oscillator I am afraid Chris! Why run at 2 MHz
anyway? I thought you would be looking to run at a much lower
frequency than that. Working close to the cut-off frequency is not
really a good idea anyway.
Roy
Preston UK
"Chris" <ns_cjrs@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:bRiVk.6742$Bc7.5092@xxxxxxxxxxxxxxxx
Well I tried one turn in the output and that gave a very low output,
two turns gave the 1.5 watt and three , five and 9 turns gave no
deflection on load at all.

I therefore think the two turn output winding gave the best match to
the transistor.

However the oscillator is not powerful enough to light my
fluorescent tube so it will not be used on my tests with the
hydrogen tubes.

I may be able to increase the power with better biasing but I have
tried lower values of the bias resistors and this resulted in very
hot transistors and lower power.

I think the low power is due to the cut off of the transistor being
2 MHz and the working frequency is 2 MHz.

I do get a 12 volt swing on the collectors and that is their maximum
as the supply potential is 12 volt also.

I will try doubling the bias resistor value to see if this makes it
more efficient. At present the bias resistors are 2.2 K ohm each
(one on each transistor), I'm going to try 4.7 K ohm in each to see
if I can get class B. This should result in higher power and greater
efficiency.

As I have been writing the power has dropped to 1.25 watt as the
transistors warm up.

--
Chris.
London,
UK.

To reply remove ns_ from e-mail address

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"Interested Lurker" <invalid@xxxxxxxxxxxxxxxxx> wrote in message
news:49257d29_1@xxxxxxxxxxxxxxxxxxxxxxxxx
Maybe an impedance match problem?

Roy
Preston UK
"Chris" <ns_cjrs@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:uKeVk.110428$mr4.39591@xxxxxxxxxxxxxxxx
I built the oscillator. However it dissipates 24 watt but the load
is only getting 1.5 watt. So I'll use the valve oscillator for my
tests.

I think it needs a better value output winding.

If my home brew devices continue to be as bad as this I may go
commercial. The big "if" is the cost.



--
Chris.
London,
UK.

To reply remove ns_ from e-mail address

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"Chris" <ns_cjrs@xxxxxxxxxxxxxxxxxxxx> wrote in message
news:ImJUk.948$iQ2.535@xxxxxxxxxxxxxxxx
I found the valve only yeilded 4 watt power so I'm designing a
transistor oscillator of the same frequency.

I'm using two power transistors of 100 watt each it should yeild
200 watt.

If my method is correct poynting's vector inside the coil will be
200/4.9E-4 =407000 watt/m^2 so the E-field will be given by:

<S>=(e0c/2)E^2 = 132.7x E^2 so E=SQR(407000/132.7)=55.38
volts/meter.

So for collision energy near windings,

40=m f p x 55.38 so m f p = 72 cm. That corresponds to a pressure
of 10^-5 Tor.

I should be able to ionise the hydrogen in this tube.

Near the axis the field will be 13800 volts/meter so the
collision energy will be m f p x 13800 = 1 x 13800 or 13.8 KeV
This corresponds to a temperature of 2.2E11 K or 1100 times
hotter than the sun's core. Hot enough for proton fusion.

I have a problem with biasing by circuit at present but the new
bias resistors should arrive on friday. The hydrogen tubes will
not be delivered until after thanksgiving.

This theory assumes that the windings of the coil act as an
antenna sending waves towards the axis and concentrating the
energy as it approaches the axis.

It is like the interior of a cylindrical mirror focussing the
radiation at the centre.



--
Chris.
London,
UK.

To reply remove ns_ from e-mail address

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