Updated 10-26-99

I suggest trying to buy parts from the IEEE parts store. They only charge a small overhead charge (which is good for the IEEE student section) and by buying in quantities they reduce the shipping overhead. And you can just buy what you need. LGH

Jameco 27422 (LM555 timer), at $0.25 each for more than 10

or

Jameco 24328 (LM556 dual timer), $0.39 efmt10

Jameco 12950 (CD4040 12 bit counter), $0.39 efmt10

Jameco 12634 (CD4011 quad nand), $0.19 efmt10

Jameco 155272 (momentary on switch), @ 0.25

Digi-Key 67-1010-ND (10 LED DIP array) at $2.85 each.

Project requires a power driver (probably a 2N2222), a transducer (Laser, ultra-bright LED, Infra-red LED or an array of LEDs), a sensor (infra-red or visible/pin diode or photo-transister, a preamp (couple LF347 quad opamps) and an 1 bit A/D (configure a op amp with a signal diode as a comparator to yield 0 or Vcc output).

Infra-red

Jameco 133946 (infrared diode lamp), 940nm at $0.69 each.

Jameco 112168 (infrared detector), 940nm at $0.45 each.

Visible

Jameco 152805 (Red ultra bright LED) 2000 mcd at 20ma, 660nm, $0.35 each

Jameco 120221 (visible light detector), 800nm, at $0.99 each.

ICs

Jameco 22904 (LF347 quad op amp), $0 .59 each for more than 10

Discrete Components

Jameco 38236 (npn transistor 2N2222), @ $0.29

Jameco 12950 (CD4040 12 bit counter), $0.39 efmt10

Digi-Key 67-1010-ND (10 LED DIP array) at $2.85 each.

There may be additional parts added for the timing circuit.

Assorted 1/8 watt resisters

Capacitors (get radial and get the cheaper ones but not lower than

25volts, don't get axial)

0.001 microfarad

0.01 microfarad

0.1 microfarad

1.0 microfarad (get lots of these but get cheap ones)

10.0 microf

47 microf

100 microf

220 microf

Trim pots @ 0.65 each

Jameco 42964, 1K

Jameco 43043, 2K

Jameco 43078, 5K

Jameco 43001 (get lots of these), 10K

Jameco 43051, 20K

switching diodes 1N4148, 36038 @ $0.03

Jameco 11421 (1x scope probes), @ $3.49 each

Breadboards

Jameco 20773 (Larger (recommended)), @ $17.95

Jameco 20757 (Smaller), @ $11.95

You may want even larger breadboards:

Jameco 20790 (3 terminal strips), @ $22.95 each

Jameco 35490 (long nose pliers), @ $4.95

Jameco 35481 (diagonal cutter), @ $4.95

Jameco 78991 (wire strippers), @ $2.95

Jameco 19289 (precut jumpers) , @ $9.95

Jameco 20079 (Jumper Refills), @ $7.95