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Assembly and Operating Instructions for Kits


Parts for the Crossed-Beam Sensor Kits (CBS-E/F)


Assembly instructions for other kits


Below is a list of the parts provided for the Crossed-Beam Sensor and Photogate Frame kits. Click on the photos for larger images.


We may occasionally make changes to the parts list without notice in order to improve the product.


Control box kit
Name/Description Quantity


PCB-mount parts
PC board 1 PC board  
8-pin socket 1 8-pin socket


PS2501-2 optocoupler 1 PC board PC board
220-Ω resistor 1

10-ohm resistor


470-Ω resistor 1

10-ohm resistor


680-Ω resistor 2

10-ohm resistor


1-kΩ resistor 2

10-ohm resistor


PN2222A transistor 1 2N2222 transistor

transistor pins

E = emitter (-)

B = base

C = collector (+)

0.1 μf 1 0.1-uf capacitor 104
Fuse holder 1 Fuse holder  
1A fuse 1 Fuse  

Panel-mount parts

Medium project box

4.875" long x 2.5" wide x 1.5" deep
(12.4x6.4x3.8 cm)

1 project box  
Label 1 PC board

Printed label for the lid including 2 laminating sheets for front and back

Drilling template 1 PC board Paper template for the placement of holes for the components
1/4-in plastic tubing 2 in poly tube Used to align the label with the lid
Infrared emitter 2 Infrared LED The longer leg is positive. The flat on the lip is nearer the shorter leg.
Infrared phototransistor 2 Infrared phototransistor The shorter leg is positive. The flat on the lip is nearer the shorter leg.
Red LED 2 red LED The shorter leg is negative. This is also the leg nearest the flat on the lip of the case.
LED holder 2 LED holder  
Linear-taper potentiometer, 10k


linear taper pot

Fine sensitivity adjustment

Linear-taper potentiometer, 100k 1 linear taper pot Coarse sensitivity adjustment
Pointer knob 2 knob  
Toggle switch 1 SPDT switch (red) On-off switch for power
Panel jack for AC/DC adapter 1 AC/DC jack Receptacle for AC/DC adapter as an alternate power source
3.5mm stereo panel jack 2 3.5mm stereo panel jack Input and output jacks
3/4-in standoff 4 Standoffs  
4-40 1/4-in bolts 8 1/4" bolts  
Cable, wires, connectors, etc
9-V battery holders 1 laydown battery holder Supplied with hook and loop strips as hold downs
3.5mm stereo male connector 1 3.5mm stereo plug  
6-ft 3.5mm male-female cable 1 3.5mm cable extender


3/32" heat-shrink tubing 2 in heat-shrink tubing  
Various lengths of hook up wire are also included in both the control box and frame kits.

Photogate Frame kit




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