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Directory:Bedini SG:Materials

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Materials List for John Bedini's Simplified 'School Girl' Motor and Battery Energizer

Materials needed, tolerances, sourcing.

Worldwide Sourcing

This page focuses on U.S.-based sourcing along with item descriptions and tolerances. Other pages with regional sourcing information are linked in this section.

If your region is not listed, and you are compiling sourcing infromation, feel free to create a regional page using this template

Australia

Australian Sourcing for Bedini SG

Europe

European Sourcing for Bedini SG

Materials List

The following is the list of materials required to replicate the Bedini School Girl circuit and motor as presented in this directory.

Parts, listed alphabetically.

BE SURE TO GET EXTRA OF EVERYTHING. YOU WILL PROBABLY NEED IT. NOBODY'S PERFECT!

Alligator Clips

Purpose: To connect batteries to circuit.
Specifications: Wires need to be larger than #20; clips need to be rated for at least 5 Amps. at least 12" recommended.
Tolerance: wide range, with the above minimums in mind, especially the wire and clip ratings.
Quantity: At least four. A dozen recommended for experimental variations (e.g. hooking up output batteries in parallel).
Sourcing: (local hardware store should have these); recommended > Minute Man Electronics Jumper Wire Test Leads - "Heavy Duty 36" Jumper Cable Set Philmore # SA45" is just the ticket with five wires of 20 guage, with alligator clips on both ends, 36" inches long, five colors; just $5.79. Minimum order: $10.00.; Digikey catalogue page on aligator clips - just the clips, no wires.; MGElectronics minimum order 100, but this is just the ticket if it can be found in smaller quantities.; Froogle > "alligator clips"
Estimated price: less than $7.00 for set of five.

Batteries, Rechargeable

Purpose: Running the circuit-motor, and receiving a charge from the circuit (input and output need to be from/to different batteries; closed loop will not work).

Specifications: 6 to 24-volt batteries. 12-volt lead acid, gel cell recommended.; Comment by Sterling, Oct. 15. I blew two transistors using a 12-volt tractor battery. This probably was because I only had 425 turns on my coil and there wasn't enough of an inductance match. Others have successfully used 12Vs.

Quantity: At least two: one for input, one for receiving charge. More recommended for experimental options. (1) Control. An identical battery to the input battery should be obtained for a control -- to test the discharge parameters of a battery independent of the circuit under the same discharge parameters being put to the input battery for characterization. (2) Additional batteries of the same voltage and impedance can be added to the output in parallel (e.g. to graphically demonstrate more output than input). This is the widest and most crucial variable in the system. Plan ahead the experiment you want to run before purchasing.

Tolerance: The voltage of the batteries is not crucial, and can be somewhere in the range of 6 to 24 volts for this particular circuit/motor. However, the input and output batteries need to be matched in their voltage and impedance (size). There can be more than one battery on the receiving end, connected in parallel, of a matched voltage and impedance (size) of the input battery. For your first replication of this , you will want to use new batteries so that bad batteries will not be a possible reasons for malfunction of the circuit. Not all rechargeables are suitable for receiving charge from this set-up. Lead acid recommended.

Sourcing: - BATT SEALED LEAD ACID 6V 4.2AH by Panasonic LC-R064R2P Digikey part number P164-ND; $8.66 each; $7.87 for 10; $7.09 for 24. (OBSOLETE; Jan. 26, 2005, these will no longer be manufactured); - BATT SEALED LEAD ACID 12V 12.0AH by Panasonic LC-RA1212P1digikey.com part number P230-ND $34.34 each.; Batteries.com - 10% off entire selection with coupon code: SS10 at checkout

Estimated Cost: $5 (or even free if you rummage) to $75 USD each, depending on make/source/size.

Battery Care: It will be important for you to know your batteries' optimal operating parameters form their manufacturer or other competent rating service so that you do not damage them by charging or discharging too fast or too high/low. As long as you are using the Bedini School Girl circuit to charge your batteries, you will not need to worry about speed or level of charging. But if you use another apparatus to charge your battery, you will need to know your batteries' charging parameters. If your input and output batteries are matched in voltage rating and impedance (size) the circuit inherently balances the charging rate to a level that is not only safe but even beneficial to the receiving battery. Overcharge is not nearly the concern with the Bedini School Girl circuit as it is with other chargers. Batteries actually perform better under frequent use with the Bedini School Girl circuit, than if you let a few days pass between uses.

Performance: See Battery Characteristics index of resources

Bicycle Wheel Rim -- Or Other Rotor Device

Non-magnetic wheel rim

Purpose: To cycle the magnets past the coil in repeated motion.
Specifications: 24-inch diameter would be fine. Bearings should be in good shape. Rotation should be fairly straight. Make sure the rim is non-magnetic.
Tolerance: + / - 10 inches in the diameter (not crucial at all). Doesn't have to be bicycle wheel. Any non-magnetic rotating wheel of similar size and weight should work. These plans are for a 24-inch rim. If you go smaller or large than this, you will need to adjust the number of magnets accordingly so that the spacing is approximately the same distance as on the 24-inch specified plans. You might want to source your wheel before purchasing magnets so you know how many magnets to get. Also, if you want to have your shaft coming from the wheel to convey the torque of the wheel, you will need to configure an alternative bearing system.
Source & Price: Free (should be able to rummage one from junk, yard sale, thrift store, bike repair shop, etc.) Take a magnet of some kind with you to make sure the rim is non-magnetic.; Try Northern Industrial Tools Poly Wheel and TireFor Garden Carts - 20 inch wheel with 5 spokes and rim of rugged, impact-resistant white polypropylene. Aluminum alloy hub has 1/2in. ball bearing bore to fit 1/2 in. axle. $19.99 sale price. Note, this wheel might not have the same smooth bearings that can be found in a mountain bike wheel, for example.
Variants: Other rotor devices used successfully: - CD ROM drive mechanism, - target board; - Child's bike wheel (plastic). Use your imagination.

Coil Spool

Purpose: To wind the parallel lengths of magnetic wire around to (1) create an electromagnet to pump the magnets on the wheel and (2) receive pulses of energy from the magnets for the receiving battery.
Specifications: plastic, 3 inch diam. by 3 inches long, with 3/4 inch center opening.
Quantity: one
Tolerance: opening needs to be +/- 20%. Length of spool can be +/- 40%. Material needs to be non-metallic, non-magnetic, and adequately sturdy.
Sourcing: Radio Shack spool for speaker or soldering wire will work. Remove wire from spool. ~$3.00 for spool with speaker wire.; Precision-Spools.com Solder Spools (without solder) - In stock: 3.5" diam flange x 3" transverse x 3/4" bore opening. $0.20 each, $200 minimum order. Will send one free sample.

Contact: Pittsfield Plastics Engineering Inc., Precision Spools Division
PO Box 1246; Pittsfield, MA 01202
Tel: (413) 442 - 0067; Fax: (413) 445 -7849
E-mail info@pittsplas.com

Diode

Specifications: recommended: 1N4001; 1 A, 50 V; (some models have used the 1N914)
Parameters: 50-300 volt range; low power, fast silicon diode
Sourcing: See Digikey.com part number 1N4001MSTR-ND
Estimated cost: less than $0.50 each

Diode, 1000 Volt

Purpose: Assure one-way flow of energy from circuit to receiving battery.
Specifications: 1N4007 (1000 Volt; 1 Amp) [A sister component to resistor 1N4001]
Tolerances: High volt rating very important; a lower Amp rating may work.
Quantity: one
Sourcing: See Digikey.com part number 1N4007MSTR-ND
Estimated cost: less than $0.50 each

Heat Sink

Sample scrap of aluminum that could be used as a heat sink.

Purpose: Dissipate heat from transistor. (Ratings of transistor should be adequate for circuit, and no heating result. This is a precautionary measure.)
Specifications: 4" x 4" x 1/16" aluminum plate
Quantity: one
Tolerance: Size not crucial; probably shouldn't be too much smaller than the above dimensions.
Sourcing: local recycler or junk yard.; NAPA part number BK 735-4369 is a fuel pump block-off plate made of aluminum, and is about of the dimensions above, and should work just fine. approx. $4.99.
Estimated Price: free, or nominal.

Magnet Core (Welding Rod)

Purpose: Electromagnet core material to propel magnets along as it is pulsed by the circuit.
Specifications: Welding rod; 0.042" inch diameter copper coated steel rod. 3 foot lengths. (will be cut to length of the coil spool
Quantity: Get 3-5 lbs. (around 10 rods of 3 feet each).
Tolerances: Rough cut okay. Diameter not crucial, could be smaller by 50% or larger by 100%.
Sourcing: Available at your local welding supply store (such as Oxyarc) or hardware store (such as True Value or Ace). Try also an auto parts store.
Estimated Price: $0.60 per rod.
Consideration: The thicker the rod, the harder it is to cut. You're going to be cutting a lot to fill the spool hole.

Magnet Wire for Coil Winding

Purpose: Is wound parallel to the #23 magnet wire. The purpose of the #20 guage is to pass current from the input battery into the coil to create an electromagnet to pump the magnets on the wheel.
Specifications: #20 wire, coated. Can't have splices.
Tolerance: #20 gauge or larger (smaller number). Don't go smaller than #20, or more than 100% larger.
Quantity: one length (~~450~~ 900 turns is about ~~175~~ 350 feet.)
Sourcing

McMaster-Carr, p. 715 (scroll down to "magnet wire"). example: 22 awg, 1500 ft/spool for $20.00. 20 awg available in 900 foot spool.
~~(PowerWerx 20# ProdID=2106 - 157 feet; $8.95~~(not long enough; will work, but not with larger voltages/impedences in the input batteries)
~~(Marlin P. Jones & Associates 20 AWG MAGNET WIRE; stock #7255 WI - 150ft; 1/2 lb. $8.95~~(not long enough; will work, but not with larger voltages/impedences in the input batteries)
Froogle > "magnet wire"
ThomasNet directory of magnet wire suppliers
Try eBay

Resources: OZ.net explanation of purpose and parameters of magnet wire

Magnet Wire for Trigger Coil Winding

Purpose: Is wound parallel to the #20 magnet wire. The #23 guage magnet wire receives pulses of energy from the magnets for the receiving battery.
Specifications: #23 wire, coated. Can't have splices. Copper with high voltage coating.
Tolerance: #23 gauge or larger. #20 guage will work fine. Don't go smaller than #23, or more than 100% larger.
Quantity: one length (~~450~~ 900 turns is about ~~175~~ 350 feet.)
Sourcing: See above.

Magnets

Purpose: Affixed to wheel to pass by the coil to both (1) receive a magnetic pulse from the input battery to propel it along and (2) infuse a pulse into the receiving winding to pass energy into the receiving battery.
Specifications: Ceramic 5; dimensions: 1" x 2" x 3/8" inches.
Quantity: 16 for a 24-inch wheel. Get some extra in case of breakage. You also might consider one or two for a control, to measure Gauss before and after experimental runs.
Tolerance: Must be ceramic (strontium ferrite). Number of magnets is not essential, though an even number and even spacing will be necessary if you wish to try and add more coil/circuits later.
Source: Magnet Sales & Manufacturing Inc. - part number 21989; Ceramic 5, standard dimensions: 1.875 x .875 x .387 inches, 150,000 in stock ; $1.60 each for 20; $0.74 each for 200. $250 minimum. For smaller orders contact their authorized distributor: Culver City Industrial Hardware 310-398-1251. $1.99 each for 20; and $0.89 each for 200.; Bunting-Magnetics.com Part #MA740 - $2.86 each for minimum purchase of 18 magnets. 240 in stock as of Sept. 28, 2004; 2 weeks lead time when out.; AZ Magnets - 2-3 week lead time; $8.82 each for 17 magnets. Price goes down to $2.50 for 160 magnets. (as of Sept. 28, 2004); Radio Shack; Catalog #: 64-1877 - 1-7/8x7/8x3/8" specs According to tech support, for these magnets, they do not give rating (e.g. "Ceramic 5"). $1.29 each.; International shipping http://www.magnetsales.co.uk
About: Ceramic Magnets

Neon Lamps

Purpose: The lamp provides a path for the output energy in case the receiving battery is disconnected while the motor is running. This prevents burn-out of the transistor. The light should not go on unless the output battery is disconnected.
Specifications: Chicago Miniature Neon Base Wire Terminal T-2 65VAC .6mA NE-2; (??) 90 Volt DC neon bulb (??)
Quantity: one
Make & Model: A1A by Chicago Miniature (definite); See also Lumex P/N GT-NE3S1025T, lumex.com Free sample
Source: Mouser.com part number 606-A1A Estimated Factory Lead Time: 1 week.
Estimated Price: $0.38 USD each.

Resistor

Purpose: Varying the resistance is the "volume/speed" control for this device.
Specifications: 680 Ohms should work well for this particular arrangement.
Tolerance: 47 ohms to 20k ohms; 1/2 W to 2 W. See Resistance specifications page.
Quantity: one, for bare minimum, but if you want to be able to tune your device, you should get one 47 ohms resistor and one 10k ohms potentiometer to connect in series.
Sourcing: digikey.com part number 680W-2-ND - includes component spec information.; Radio Shack has a wide range of resistors and potentiometers.
Estimated Price: $0.23 USD each. Usually come packaged in 5 or 10. Potentiometers run around $3.00.

Super Glue

right

Purposes: (1) for attaching the transistor to the aluminum heat sink; (2) for securing the welding rods inside the spool to serve as a core.
Specifications: standard super glue
Quantity: will need quite a bit to secure all the welding rods (e.g. four tubes of 3 gm)
Tolerance: Any adequate glue will do. Tape can be used in some placed.
Sourcing: (most hardware stores and grocery stores should have it); 3 gm Super Glue Adhesive $0.95 each

Tape

Purpose: For second level of adhesion of magnets to wheel (beyond just glue). Also to maintain wires to prevent snagging.
Specifications: One-sided, preferably electric tape or duct tape.
Tolerances: Any tape that is adequately sticky and non-magnetic.
Quantity: Enough for the circumference of your wheel plus a little for overlap and do-over.
Sourcing: Most any store.; UU77 $1.09 / roll; $0.20 / 10 rolls.

Transistor

Specifications: 2N3055 Transistor, 100V, TO-3 case; fully metal
Tolerance: Don't monkey with this one. Get the exact component called.
Quantity: One, for the circuit. Several extra in case you burn one up.
Sourcing: See Digikey.com part number 2N3055OS-ND (View spec sheet)
Estimated Cost: $2.10 USD each

Wood (Stand)

Purpose: to hold the wheel steady, and to fasten the circuit and hold the coil.
Specifications: plywood or solid wood
Quantity: one sheet approximately 3' x 2' feet square by ~3/4" inch thick (to be cut into three pieces -- two for uprights and one for base); two lengths of 2" x 6" or larger of about 6 inches long (to hold coil and stabilize uprights)
Tolerance: any non-magnetic material of size and thickness adequate to hold the wheel
Sourcing: available anywhere; try any construction site or do-it-yourself friend's garage; or junk yard. Last resort, try lumber yard or hardware store.
Estimated Price: free, from scrap pile (any construction site); or $17.00 for new 4' x 8' sheet of particle board; $3.00 for new six-foot 2" x 4".

Tools Needed

Wire cutter.
Something to cut the welding rods to length (may want to use cutter available where you purchased the rods).
Something to fabricate the stand for the wheel. (e.g. jig saw to cut wood).
Soldering gun and solder.
Metal drill to put hole in aluminum heat sink to fasten circuit to device.
Screw driver and 2-4 screws to screw heat sink to stand.
Paintbrush and paint or sealant, to apply paint or sealant to wood.
Skill Saw, to cut boards.
Drill, to wind wires on coil.

Contacts

Digikey

Digi-Key Corporation 701 Brooks Avenue South Thief River Falls, MN 56701 USA

Phone: 800-344-4539 or 218-681-6674 Fax: 218-681-3380

Email: webmaster@digikey.com

Radio Shack

1-800-THE-SHACK (1-800-843-7422)