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
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
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.
>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.
>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
>>Subject: Dyna-motor generator
>>I have an antique dyna-motor generator that is fried. I took it apart
>>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.
>>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
>>it internally. It may be picking up a small amount of magnet field from
>>drive section but it can't be very much because of the way its designed
>>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.
>>output of the generator is totally from the #16 winding. I think the
>>is suppost to be 32 vac 15 amps. I can use a step up transformer to get
>>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
>>It was probably built around the turn of the centery. The original name
>>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?