Hi Luther,

first which schematic are you following...
it sounds like you used the old SG Schematic shown on Keelynet site......
if you are using the Simplifed SG Schematic as posted on the Peswiki
site, then

replace the 680 ohm resistor, with a low value resistor, 10 ohms or so,
in series w/ a 1K pot to tune it and a 12V - 14V 5ma -100ma Radio Shack
lite bulb in series with the pot, for the trigger circuit, use what
ever size lite bulb glows good, but it's resistance is not high enough
create the extra pulses

put a current meter on the drive batt feeding the circuit, and if you
dont have a o-scope use a cheap AM radio, and adjust the pot up so that
you have the lowest current draw, and the motor noise on the am radio
is steady, once this point is reached, then any more adjustment up on
the pot value will make the extra pulses and start pulling more current
and the buzz on the am radio will change, back off a little and it will
stablize at that lowest current draw point, with out the extra pulses

if the magnets are to strong, and causing the extra pulses, then back
off the coil from the rotor till the extra pulses go away and then you
can tune it normal,

with a little playing with it you will find that lowest current,
highest rpm sweet spot and is EASY to hear on the radio when you go past
that spot while tuning up on the pot, also the trigger lite bulb will
start flashing when the extra pulses show up......

on the SG 1n4007 output diode, to the output battery make it out of 5
or more parallel diodes

i would get some bigger batterys to test, use one to drive the motor
and 4 to charge , then just keep rotating the batts for your school
run duration

sounds like you have a good start, just needs tweeking......

RS

>
>Can anyone assist me? My son and I have built the Bedini school girl
>motor using the following:
>MAGNETS: .750" x .750" x .125" Thick NdFeB Plate Magnet. Grade N40
>Ni plated with matte finish magnetized through thickness.
>ROTOR: Colson 2-2-45 ball bearing wheel 2 1/2" diameter x 1 1/4"
>wide (used for furniture dolley) non-metallic wheel with metallic
>core & bearings.
>COILS: 2 Radio Shack spools from their Assorted Enamel-Coated Magnet
>Wire Package 1 1/2" tall x 2" diameter. Inner diameter is 3/4".
>Coils (both generator and power) are stuffed with Lincoln Electric
>Fleetwood welding rods 3/32" diameter (flux removed).
>MAGNET WIRE: The magenet wire we are using is from BAE Wire in
>gauges 22 and 26 coated.
>Power Coil is bi-filer wound with 600 (drawing called for 450 to
>800 - we just started in the middle)turns and generator coil (Number
>of turns not stipulated in drawing) has 1000 turns of #26 wire.
>The rest of the components are as listed on the drawing. The
>transistor is the 2N3055 from Radio Shack. The resistor is 680 ohm
>metal film. The diode is the clear glass kind. The batteries are 9
>volt Energizer 2010 Alkaline.
>Now to the problem:
>When we assembled the motor, we placed the rotor as close to the
>power coil as spacing would permit with spacing approximately 3/16"
>in order for the magnets to clear the coil. (These magnets are
>really strong). We also installed the generator coil within 1/4"
>clearance and then gave it a spin. The led on the generator coil lit
>briefly but motor did not continue to spin. I bypassed the
>transistor and hooked the large wires directly to the 9 volt to see
>if we would get a reaction - yes, magnet was repulsed. After
>checking all solder joints, we bypassed the 680 ohm and got the unit
>to spin for about 25 minutes before it ran down. So, I figured the
>current was being choked down too much to actuate the transistor. I
>swapped the 680 ohm for a 270 ohm and the unit ran for almost an
>hour. In trying to determine the reason for the short run time, I
>tried 2 things: I lifted the wheel by an 1/8" (thinking the magnets
>put too much drag on the generator coil core) and added 330 ohms in
>series to the 270 ohms to yield 600 ohms on the base. Now the motor
>runs for about 2 hours and then winds down. Thinking the magnets are
>still too strong and that the coil is not able to overcome the
>strength of the magnets sufficiently to continue running, I lifted
>the magnets another 1/8" and ran again with fresh battery. Again,
>total runtime is almost 2 hours - so clearly, I have done something
>wrong here. At this point, we are stuck. My son has to have this
>turned in by Wednesday 2/23 for a science fair. Does ANYONE have an
>idea where we might have gone wrong? I can send pictures on Monday
>2/21 if anyone wants to have a look. Other than the 2-hour runtime,
>the motor works great and the led on generator coil is nice and
>bright. While reading some of John Bedini's documentation, I saw a
>remark that said there has to be a neon lamp between the base and
>the emitter? Does anyone else know what this is for and what I
>should use, and how it should be connected?
>
>Thanks and best regards to all,
>
>Luther Goodman
>Spring Texas
>
>