Re: Useful work and fun with Tesla apparatus.

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <uncadoc-at-juno-dot-com>

Malcolm, All ,   What would you suggest as a starting point for a filter
resonant at gap fire frequency at the receiving end for a remotely fired
Tesla receiver. What kind of filter could this be?  Should it be an
adjustable filter?  We use a ferrite rod inside the separate tuning coil
now, but it seems to not make a great difference.  And where should this
'tuning' coil be placed in the circuit?  Should it be installed in the
remote primary where the ferrite based coil is now(where the spark gap of
the primary sending coil would be as a reference)?  We are using a 7
point R.Q. copper fitting(Consisting of eight 3/4 inch copper couplings)
gap at this time on the sending coil, with the thickness of a postcard
(more or less)between them.  I can supply our existing coil specs(winding
wire size and coil diameter and length) if you need them, but I am not
good at the math.  Also, I am puzzled that we cannot get a small A.C. fan
motor to operate, try as we might, what could we be missing here with our
attempt to run an A.C. small refrigerator motor, the kind with the copper
ring run across the laminations.     Al.

On Sun, 04 Mar 2001 13:26:15 -0700 "Tesla list" <tesla-at-pupman-dot-com>
writes:
> Original poster: "Malcolm Watts by way of Terry Fritz 
> <twftesla-at-uswest-dot-net>" <m.j.watts-at-massey.ac.nz>
> 
> Hi Al,
> 
> On 2 Mar 01, at 7:49, Tesla list wrote:
> 
> > Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>"
> > <uncadoc-at-juno-dot-com>
> > 
> > Hi Ed, Bert, Malcolm, and other list members.  I have experimented
> > with many types of surplus motors, mostly from Edmund Scientific, 
> some
> > from old toys and the best results are with the small D.C. motors 
> that
> > I rectify with a set of 1n914 little glass diodes as a full wave
> > bridge.  I tried large silicon rectifiers from 1N4001 up to 
> 1N4007,
> > and the one piece encapsulated full wave bridge, but the best 
> results
> > are with the little 1N914 diodes.  Maybe there is something to the
> > reverse or leakage voltage that makes them work better, I really 
> don't
> > know why, maybe the larger silicon diodes would work if my coil 
> had
> > more power output, this will take more experimentation (and 
> money!). 
> 
> It is the better recovery time of the 1N914's that makes them work 
> better. Also, try Schottky diodes for lower conduction losses.
>  
> > The best results I have to date are running a small 3volt motor 
> with a
> > model airplane propeller at a distance of 20 feet from the Tesla 
> coil.
> 
> Now using a TC to fly an aeroplane would be a neat party trick. 
> Streamers pouring off the propellor would add to the appeal.
> 
> >  The tuning is real finicky and will tend to drift somewhat.  But 
> when
> > tuning is optimal the motor will really pick up speed!  I suspect 
> that
> > the spark gap is the demon that creates voltage fluctuations.  I 
> use a
> > mirror image Tesla setup to receive the output from the source 
> Tesla. 
> 
> The spark gap is a culprit. So too are any streamers coming off the 
> transmitting coil. I noticed a lot of jittery illumination when 
> running toy lamps and you could see the gap brilliance varying in 
> step.
> 
> > Fine tuning is helped  with a ferrite rod inserted a tuning coil 
> at
> > the receiving end of the setup. The receiver is on casters and can 
> be
> > wheeled across the room to test the max distance of wireless 
> power.  I
> > realize that it is only a small setup, but it is interesting to 
> watch
> > a motor develop speed wirelessly and illuminate small lamps.  I am
> > trying to run various kinds of small A.C. fan motors but have not 
> had
> > any success yet, but will keep trying, maybe I do not have enough
> > power output or the frequency of my coil is not optimal for that 
> type
> > of use. 
> 
> One approach might be to use a filter resonant at gap fire frequency 
> 
> at the receiving end.
> 
>    You will need to rig the receiver secondary with a suitable
> > antenna, this also takes much experimentation. More details can be 
> had
> > by getting the booklet by Gary L. Peterson.  It will give all the
> > basic details that you can use as a point of departure for your
> > experiments.  Enjoy!   Al.
> 
> Regards,
> malcolm
> 
> 
> 

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