The basic materials for building an electro-graf can be purchased using a combination of online vendors and local hardware stores. A small (100 LED, 4' x 4 ') electro-graf could run ~$100. A large piece could cost as much as $2000 dollars, but thats just a WAG
Part: Super Shield conductive spray-paint
Vendor: Less EMF
Average cost: $22 per can
Notes: this is the secret weapon.
Part: spray-paint, color your choice
Vendor: I use Krylon from the local hardware store
Average cost: $22.50 for 6 cans
Notes: use what you like.
Part: Magnet paint
Vendor(s): Less EMF
for premixed indoor paint called Magic Wall or Magically Magnetic, Inc.
for paint additive. This additive can be mixed with indoor or outdoor primer sealer.
Average cost: Magic Wall @ $29.95/quart; Magnet paint additive @ $15/quart and primer sealer @ $8.50/quart
Notes: I used Zinnser BULLS-EYE primer 1-2-3 primer sealer
for the base paint on the outdoor electro-graf proto. It's the good stuff. Your local hardware store is sure to have a thick outdoor primer that will work. You can get worse paint for less money. Note: Don't believe the hype. The paint itself is not magnetic. It is just metallic and magnets adhere to it.
Part: 10mm LEDs. The color choice is yours.
Vendor: Again, it's my crew Denny, Ann, et al. @ HB Electronic Components.
Avg. Cost: $0.20 per LED
Notes: you can use smaller LEDs, but it's just not my taste.
Part: 1/8" Dia. x 1/16" Thick NdFeB Disc Magnet, Ni-Cu-Ni plated
Vendor: Amazing Magnets
Cost: $9.00 per 100 magnets
Notes: Cost reductions for larger quantities
Part: Power supply.
This will vary based on number and types of LEDs, circuit design and environment. You must supply the LEDs with >= 3 volts DC power. Depending primarily on the number of LEDs, you can use anything from a $2 9 Volt to a $50 dollar car battery to a regulated 500 Watt power supply if the proper current limiting components are used. In the lab I use a regulated DC power supply. We will discuss this more in the following steps.
Vendor: your local hardware store should have painter's tape and masking tape. Get both.
Cost: $2-$5/ per 60 yard roll
Notes: 3M painter's tape is blue and has less adhesion than masking tape. Both tapes are useful in different situations.
Parts: 5 minute epoxy
Vendor: your local hardware store should have 5 minute epoxy
Cost: $5 dollars for one tube
Notes: This is some delightful shit. Get the kind in the two part dispenser.
Part: Stencil materials -- Acetate, Manila Folders.
Vendor: Your local art store or office store should have acetate, cardboard and file folders.
Avg. Cost: $10 for a 25' x 12 ft. roll of acetate, folders and cardboard vary in price and is often found for free.
Part: Stranded wire
Cost: $3 per roll
Notes: any 18-24 AWG stranded hook-up wire will work. Solid core wire is too brittle. OPTIONAL
Part: 1/4 or 1/2 Watt resistors, the choice of value is yours
Avg. Cost: $1 for 100 pieces
Part: 3/4" Foil Tape
Vendor: Newark In One
Avg. Cost: $18 per roll
Part: Conductive Epoxy
Vendor: Newark In One
Notes: The epoxy is optional. It is used to attach magnets to electronic components and wire.
Part: you can add electronic components to create LED sequences, animation, solar power, etc. You may need stranded wire for connecting your LED traces to various power sources.TOOLS
a respirator, a mutimeter, paint brushes, containers for mixing paints, exacto blades, clay