amp could modulate a Tesla coil (see
Figure 9), as Alexanderson modulated
his big alternator-transmitter. I used
the schematic in Figure 4. The Navy
booklet, Magnetic Amplifiers served
as a reference.
I first obtained a ferrite rod
(material #33), six inches by just
under 1/2-inch diameter. I got it
surplus from Alltronics, for about $5,
but it’s no longer available, though
they do carry a four-inch for
$5 ( www.alltronics.com.) Another
source for rods is Surplus Sales of
Nebraska ( www.surplussales.com).
From Alltronics I also got spools of
magnet wire — #26 for the two loading coils and #30 for the control coil.
I wound my coils, not directly on
the ferrite, but on acrylic tubing, 1/2
inch inside diameter (from Tap
Plastics), which I could slip over the
rod. A section of the tubing and a
couple of nylon fender washers from
the local hardware store made a well
insulated spool or coil form on which
to wind the coils on my winding jig.
The loading-coil spools were 1-1/8
inch wide, the control coil two inches
wide. For the loading coils, I wound
13 layers, 860 turns of the #26 wire,
laying on some electrical tape for
extra insulation between each layer.
I wound the two loading coils in
opposite directions. The control coil
took 400 feet of the #30 wire.
A mag amp is frequency specific
according to the size of its loading
coils. (Thus, an audio amp would be
quite large.) I wanted 180 kilocycles,
and I determined the number of turns
experimentally.
For the rectifiers, I used eight
1,000-volt, three-amp 1N4008 diodes,
four in each leg (three for a $1.00,
from All Electronics, www.allelectron
ics.com). The mag amp was now safe
to 4,000 volts and could handle the
output of my solid-state Tesla coil.
Performance
So that I could observe the mag
amp’s performance with my signal
generator and oscilloscope, I replaced
George Trinkaus’ High Voltage
Press is at
teslapress.com
the 1N4008s with two low-power signal diodes. In series with the control
coil, I put a 12-volt battery and a telegraph key, as a convenient switch. The
mag amp is frequency-specific; you
design it for a particular range. Keyed
on and off, the mag amp showed
response from 155 to 200 kilocycles (a
range that happens to fall within the
license-free experimental radio band
called LowFER).
What a versatile device! At a
particular frequency, operating the
key would increase or decrease the
amplitude of the wave as traced on
the scope. At another frequency, the
keying would shift the frequency back
and forth, and at another it would
shift the phase.So this one little
device, depending on how it was
tuned, could do on-off keying
(CW), amplitude modulation (AM),
frequency-shift keying (FSK), frequency modulation (FM), or phase-shift keying (PSK), including bi-phase-shift keying
(BPSK), which
is a common
mode of digital transmission. Placed in
the ground
circuit of my
solid-state
Tesla-coil, the
little mag amp
showed that it
could do all of
the above
with more
than 3,000
oscillating
volts running
through it.
This would be
quite a task for
a vacuum tube
and probably
beyond any
transistor.
And I built
it myself. NV
■ FIGURE 9. In
Tesla Coil Circuit.
Amazing Devices
www.amazing1.com
Laser Modules
All laser modules operate from 3 volts and include built in optics
providing a parallel beam of 1mr or less. Includes instructions on
safety requirements for FDA full compliance
Red - Class IIIa
LM650P3 -3mw650nm12x45mm ........ $14.95
LM650P5 - 5mw 650 nm 12 x 45 mm ....... $24.95
LM630P3 - 3mw 630 nm 10. 5 x 45 mm .... $34.95
Red - Class IIIb
LM650P10 - 10m w 650 nm 12 x 51 mm ... $99.95
LM650P30 - 30m w 650 nm 12 x 51 mm . $249.95
Green - Class IIIa
LM532P5 - 5m w 532 nm 12X45 mm ........ $49.95
Infrared - Class IIIb
LM980P30 - 30m w 980 nm 12X30 mm ..... $49.95
Laser Diode Visible Red - Class IIIb
LD630-P10 - 10mw 635 nm 5 mm diode .... $29.95
High Voltage Capacitors
Ceramic capacitors for voltage multipliers, etc.
22/6KV - 22pfd6kv. 28” x. 17” ................. $. 35
50/6KV - 50 pfd 6kv .325” x . 18” ................ $. 45
100/6KV - 100pfd 6kv. 46” x. 17” .............. $. 65
200/3KV - 200 pfd 3kv . 3” x . 25” ................ $. 45
270/3KV - 270 pfd 3kv . 3”d x . 25” .............. $. 45
470/10KV - 470 pfd 10kv . 35”d x . 25” ......... $. 75
1000/20KV - 1000 pfd 20kv . 5”d x . 37” ..... $2.25
.01/2KV - .01mfd 2kv . 63” x . 13” ............... $. 50
Energy Storage Capacitors
Electro-kinetics, wire exploding, can crushing, emp, etc.
25M/5KV - 25 mfd 5 kv 312J 10 x 4 x 3 can ...... $100.00
32M/4.5KV - 32 mfd 4. 5 kv 324J 9 x 4 x 2 can ... $170.00
10002M/2KV - 1000 mfd 2 kv 2K J 4 x 8 x 7 can $299.00
1.3M/100KV - 1.3 mfd 100 kv 6500J case ........ $750.00
High Voltage Transformers
Includes circuit schematics on how to use.
28K089-7kv10ma30khz9-14v 1”cube . $19.95
28K074-4kv15ma30khz9-14v 1”cube . $17.95
28K077 - 2kv 10ma 30 khz 7-9v .7x 1.25 .... $9.95
CD25B - 20 kv trigger pulse 1 x 1.25 ...... $16.95
CD45 - 40 kv trigger pulse 1.25 x 1.25 .... $18.95
TRAN1035- 10kv35ma bal output ........ $39.95
FLYLABURN- 10kv60ma endgrd ...... $49.95
FLYEXP - 4 misc flybacks ................... $24.95
FLYHP - High powerlargeflyback ........ $34.95
High Volt/Freq Modules
12 vdc with instructions on how to use.
MINIMAX1 - 1kv 15 ma 35 khz ................ $17.95
MINIMAX2 - 2kv 10 ma 50 khz ................ $17.95
MINIMAX3 - 3kv 10 ma 35 khz ............... $19.95
MINIMAX7 - 7kv 10 ma 35 khz ................ $34.95
SS01S - 1to7kvac for ozone .............. $24.95
GRADRIV10 - 7. 5 kv 15 ma 35 khz adj .... $79.50
PVM300 -20kv25ma115vacinput ......... $179.95
High Volt DC Modules
12 vdc with instructions on how to use.
PBK40 - 10 kv 100ua 9 vdc in .................. $34.95
CHARGE10 - 10kv 2.5 ma ....................... $59.95
SHK10 - 2kv 10 ma shocker .................... $39.95
TRIG10 - 20 kv trigger/shock pulses ........ $54.95
SS016S - +20kv100ua ............................ $29.95
SS010S - -20kv for neg ions .................... $24.95
Parts for Tesla Coils
Includes plans for two of our coils. Parallel for 60&120ma.
4KV/.03 -4kv30ma60hzfloatingoutput ........ $59.95
6.KV/.02 - 6.5kv20ma60hzfloatoutput ......... $59.95
9KV/.03 -9kv30ma60hzmidgrdoutput ..... $79.95
12KV/.03 - 12kv 30ma60hz midgrd output .... $109.95
15KV/.03 - 15kv 30ma60hz midgrd output .... $139.95
14.4KV/.5A - 14.4kv.5amppolepig ............ $699.95
Spark Gaps and Electrodes
SPARK1 - Fan cooled dual gap 3/8” tungsten $149.95
SPARK05 - Single gap 1/4” tungsten ............ $49.95
TUNG141B - 1/4” x1” pair electrodes with holders tungsten $14.95
TUNG38-3/8” x2” pairelectrodeswithholderstungsten .... $59.95
Toroidal Terminals
TO8 - 8 x 2” Spun Aluminum Toroid .... $59.95
TO12 - 12 x 3” Spun Aluminum Toroid . $79.95
TO24 - 24 x 6” Spun Aluminum Toroid $399.95
TO30 - 30 x 7”’ Spun Aluminum Toroid$525.95
See website for more data on above items
Minimumorder is $25.00. Volume pricingavailable
Information Unlimited, Box 716, Amherst, NH 03031 USA
Orders: 800-221-1705 Info: 603- 673-6493 Fax: 603-672-5406
Email: riannini@metro2000.net
February 2006 71
