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2N3055 Inverter


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From:  gweaver [SMTP:gweaver-at-earthlink-dot-net]
Sent:  Wednesday, May 27, 1998 6:51 AM
To:  Tesla List
Subject:  2N3055 Inverter

That sounds like a good plan.  Do you have an inverter circuit that you can
email to me?  gweaver-at-earthlink-dot-net

I built a circuit using a 555 timer IC to drive a 2N3055 transistor at 60
HZ.  I am using 12 VDC to power this device and the output goes to a 10:1
step up transformer.  It won't work because the transistor won't shut down
completely.  I need the transistor to go from 0 volts to 12 volts and back
to 0 again but what I am really getting is 5 volts to 12 volts and back to 5
again.  

Another thing I built is a 100 amp relay wired so when it turns on it breaks
the circuit and turns off again.  The relay buzzes ON/OFF very fast and
loud.  I connected 12 VDC to the extra relay contacts and to a 10:1
transformer and get 120 volts AC out at some unknow frequency.  This thing
is very loud and the relay contacts over heat.

I also have a 12 volt DC fork lift motor driving a 90 volts DC permentant
magnet motor.  The 90 volts DC motor puts out about 89 volts.  It works
great but a neon won't run on DC volts.  This thing will light up 8 100 watt
light bulbs.

5 amps X 12 volts = 60 watts, thats not enough to run a neon.  I have about
18 or so 2N3055 transistors.  Can I put several transistors in parallel to
increase the power.  I would like to have 1500 watts but for now I will take
anything I can get and worry about more power later.

Will the high frequency feed back from the TC thourgh the neon effect the
inverter?  Might need a filter circuit. 

Gary Weaver 







>From:  Bill Noble [SMTP:william_b_noble-at-email.msn-dot-com]
>Sent:  Tuesday, May 26, 1998 1:54 AM
>To:  Tesla List
>Subject: motor generator
>
>why bother with a motor generator when you can make a perfectly adequate
>inverter with an old filament transformer and a couple of transistors??
>Seriously, all you need are the transformer, two transistors and four
>resistors. How much power do you really need?  a 2n3055 will cary about 5
>amps at 60 volts, and it's really cheap.  The old motor/generator is
>probably worth more as something to put on the shelf than as a power source.
>
>There are such things as self excited generators, back in the dark days when
>I worked on airplanes, the L-1011 had such a thing, wherein a permanent
>magnet got the thing started, and then one winding acted as a generator to
>provide current to the other.  This eliminated the need for brushes, which
>is good in an aircraft application.
>-----Original Message-----
>From: Tesla List <tesla-at-pupman-dot-com>
>To: 'Tesla List' <tesla-at-pupman-dot-com>
>Date: Monday, May 25, 1998 8:39 PM
>Subject: Dyna-motor generator
>
>
>>
>>----------
>>From:  gweaver [SMTP:gweaver-at-earthlink-dot-net]
>>Sent:  Monday, May 25, 1998 11:36 AM
>>To:  Tesla-at-pupman-dot-com
>>Subject:  Dyna-motor generator
>>
>>I have an antique dyna-motor generator that is fried.  I took it apart
>today
>>and unwound one of the windings.  I am trying to figure out what makes this
>>thing work.  When I get it fixed I hope to run the generator on my car
>>battery to get 120 vac to power a Tesla Coil.
>>
>>The armature has a DC winding with brushes.  This winding has 16 coils.
>The
>>field winding has 2 coils and is only wide enough to cover the 16 drive
>>winding, not the generator windings.  These coils are not connected to the
>>generator coils.  Probably 6 volt DC winding.
>>
>>The generator section is offset from the drive section about 2".
>>
>>The generator section has no field winding.  The generator has 2 sets of
>>windings that turn on the armature.  One set of winding are wound with #26
>>wire and the other set of winding are wound with #16 wire.  Each of these
>>windings has 4 coils like a 60 HZ electric motor.  Each set of winding are
>>rotated (offset) from each other, it looks like the start and run windings
>>of an electric motor.  The output is from 2 circle rings and brushes.
>>
>>This is the interesting part.  The generator section has on power applied
>to
>>it internally.  It may be picking up a small amount of magnet field from
>the
>>drive section but it can't be very much because of the way its designed
>with
>>the 2 being seperate.  The #26 and #16 winding are both connected in
>>parallel.  The #26 winding is connected to a centrifical switch.  As the
>>armature picks up speed the switch opens and drops out the #26 winding.
>The
>>output of the generator is totally from the #16 winding.  I think the
>output
>>is suppost to be 32 vac 15 amps.  I can use a step up transformer to get
>120
>>vac or rewind the unit to produce 120 vac.
>>
>>Is the #26 winding some how energizing the generator to get it started?
>>Then once it starts generating it energizes itself?
>>
>>This thing is very old.  I got it at an old antique engine show last
>summer.
>>It was probably built around the turn of the centery.  The original name
>tag
>>is still on it.  It has nothing stamped on the name tag where it says volts
>>and amps.  The volt meter goes to 50 volts and the amp meter goes to 15
>>amps.  I know that many of the early generators built in those days were 32
>>volts so I figure this thing is probably designed to produce 32 volts.
>>
>>The name plate says.  Fort Wayne Electric Works.  Fort Wayne Indiana.  It
>>even has the serial number.
>>
>>It has 2 panel mount meters that are both broken and 2 variable resistors.
>>One variable resistor says volts and the other one says amps.  One of the
>>variable resistors is broken.  The wiring to the meters and resistors are
>>missing.   I would like to hook this thing up without the meters and
>>resistors if it will run that way.
>>
>>Does anyone know anything about this type of generator technology?
>>
>>Gary Weaver
>>
>>
>>
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