Newman machine replica

[hartiberlin]

P.S: On this scope view you can not see the input current as the amps/ div
setting is just too big.
You just see only the big back current spike, when the commutator is
switching.
As Lutec uses much iron in their design, the back spike looks much like
a (sine)^2 pulse, so there are no RF bursts with it as in the Newman
devices.
The bigger older Newman devices with hundreds pounds of copper
wire  also had much more DC current components
superimposed on the RF bursts, so that depends on the inductance
and the stray capacitance of the coil.

[Paul-R]

Hartiberlin im going to be getting my copper wire out of some old car alternators assuming that the copper from one alternator may not be enough

Its hard work but:
if you are looking for enamelled copper wire, find an
old dumped and scrapped microwave oven. Open it up,
and remove the big transformer near the "mains in". With an
angle grinder, cut through the steel laminated core, and with
difficulty, you will be able to carefully wriggle out three coils,
two with thinner wire, and one with thicker wire. You may need
to use water to soak off some stiff paper.

As you uncoil the wire (slowly and carefully, you may crack the
enamel insulating coating. You may need to paint a bit more on.

(Don't forget the nice ceramic magnets in the magnetron unit which
comes off the cooking chamber)

Paul.

[hartiberlin]

Hi MRAMOS,
try to use better around 100 nF foil capacitors, which go to over
1000 Volts or just try the AC caps, but only try it behind
a safety wall, so if the electrolyte cap blows up you will
not get hit...
These voltage and current spikes from the coil can really
blow up electrolyte caps, so better use high voltage foil caps.

A capacitance of around 100 nF to 1 uF is enough.
If you have one tap inside the coil just connect the cap from the
tap to one end.
Try to which one  end is better.
Be sure to not use DC electrolyte caps if you use electrolyte caps at all!
10 uF might still be too big and if you have several of these better
put 2 or 4 in series, so it goes more into the direction 1 uF.
Too big capacitance could drain the battery too fast as it has to
provide the energy to charge the cap upin the first place.

[hartiberlin]

Hmm,
what shunt did you use to take the input current scope shot ?
Is the scope grounded ?
Please remove the grounding.
What is your DC coil resistance in Ohm ?
Probably you have much to low resistance and too few coil wire.
Also the spark should be to see much bigger on the scope,so you have
very few energy stored in your coil somehow...

Is this now with Tungsten and graphite at the commutator ?

[TheOne]

nice replica also nice toe!