Parts List

for basic circuit diagram (printed circuit board calls for slightly different parts list - see the pcb webpage):

from Radio Shack:
a. (8) TIP-120 transistors
b. (8) heat sinks for above
c. (8) 1/4W 470 ohm resistors
d. (8) 2.5A 100 V PIV diodes
e. (4) 1/4W 220 ohm resistors
f. (2) 74LS04 hex inverters
g. (1) large instrument box
h. (1) 276-160 circuit board
i. (1) 25-pin cable
j. (1) 25-pin connector kit
k. (2) 9-pin connector kits
l. (4) momentary push buttons - normally off, temporarily on
m. (1) 3-way center-off switch
n. (1) 2-way switch
o. (1) package of small diodes
p. (2) IC 14 pin sockets
q. (1) 7805 power regulator chip
r. (1) heat sink for above
s. (3) 0.1 uF capacitors
from a local well stocked electronics store:
a. (4) 30V 5W zerner diodes
 

gear reducer:

from a motions control outfit such as:
Torque Transmissions (TorqueTran@aol.com, 1-216-352-8995) (60:1, use final roller reduction of 40:1) or
Allied Devices (100:1, use final roller reduction of 24:1) (1-516-223-9100) or
Andy Saulietis' hard plastic gear reducers (iss@pvtnetworks.net) or
Larry Myers' Byers gears (http://www.mountaininstruments.com or larrym@foothill.net) or
Dave Radosevich's Byers gears (Dave_Radosevich@qmail4.nba.TRW.COM):

a. 1 gear reducer per axis ~$100 (aim for gear reducer multiplied by final roller reduction to equal about 2400:1, this gives 1/4 arcsecond per microstep, exact microstep size is entered in the CONFIG.DAT file)
 

2 stepper motors:

from a surplus house such as:
Wacky Willy's Surplus in Portland Oregon (1-503-234-6864 or 1-503-642-5111)
C & H Sales (1-800-325-9465) http://www.aaaim.com/CandH/index.htm
Herbach and Rademan (1-800-848-8001 orders, 1-215-788-5583 catalog) or
Gateway Electronics in San Diego (1-619-279-6802), motor part Slo-Syn M061-FDD2 35 oz-in 5V@1A 1/4"shaft with 6 leads, $9 ea or
Marlin P Jones Associates (www.mpja.com) (also a source of inexpensive halfstep unipolar stepper driver units) or
Jameco (1-800-831-4242)

a. (2) stepper motors: 6-12 VDC .3 to 1 amp/phase 20+ in-oz torque ($2+), preferably 6 leads, but 5 or 8 lead motors will do, 4 lead motors are bipolar motors and not suitable, preferably 200 steps per revolution
 

2 encoders:

  • part number S2-2048-B from US Digital, seller of Hewlett-Packard encoders
  • The optional SAA1042 can be ordered from Newark Electronics Phone: (800) 4NEWARK (http://www.newark.com/OLCATLG.HTM) Newark Part #: 08T SAA1042V, Manuf Pt #: SAA 1042v, Manuf: Motorola, $12.01 for 1-9
     

  • Mobile Planet, a particularly complete source of laptop and mobile accessories


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    continue onto 'Parallel Port Interface'
    ...by Mel Bartels