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Assembly and Operating Instructions for Kits


Parts for the Photo Gate 2i Kit (PG2i)


Assembly instructions for other kits


Below is a list of the parts supplied with the Photo Gate 2i kit. Click on the photos for larger images.


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


Name/Description Quantity


PC board 1 PCB  
470 Ω resistor 2

470-ohm resistor


1 kΩ resistor 2

1k resistor


0.01-uf capacitor 1

0.01-uf capacitor


10-kΩ potentiometer

(variable resistor)

1 10k pot  


Silicon-controlled rectifier


1 EC103D SCR

SCR pins

C = cathode (-)

G = gate

A = anode (+)

LM555 Timer

1 555 timer

555 timer pins

Note the location of pin 1

relative to the notch on the IC.

8-pin socket


8-pin socket  
Interrupter 1 Interrupter interrupter graphic
Red LED 1 red LED  
LED holder 1 LED holder  
RCA jack 1 RCA panel jack  
Toggle switch 1 SPDT switch (red)  

9-V battery holder


1 laydown battery holder includes hook and loop tape
Small project box 1 project box  
7/8-in standoffs 4 Standoffs  
1/4-in 4-40 bolts 8 Bolts  
1/4-in plastic tubing 2 in poly tube  

Printed label for the lid


1 lid label

includes 2 laminating sheets

for front and back

Drilling templates 1 lid label  
Lengths of various colors of hook up wire are also included.



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