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Assembly and Operating Instructions for Kits


Parts for the Sound Trigger 4 Kit (ST4)


Assembly instructions for other kits


Below is a list of the parts supplied with the Sound Trigger 4 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


PCB-mount parts

10-Ω fixed 1

10-ohm resistor


680-Ω resistor 2

680 ohm resistor


1-kΩ resistor 4

1k resistor


22-kΩ resistor 1

1k resistor


100-kΩ resistor 1

1k resistor


1-MΩ resistor 1

1k resistor


0.0047 μf 1 0.0047-uf capacitor 472
0.047 μf 2 0.047-uf capacitor 473
0.1 μf 1 0.1-uf capacitor 104
2.2 μf 1 2.2-uf capacitor  
4.7 μf 1 4.7-uf capacitor  
10 μf 1 10-uf capacitor  
100 μf 1 100-uf capacitor  
470 μf 1 470-uf capacitor  

Silicon-controlled rectifier


1 EC103D SCR

SCR pins

C = cathode (-)

G = gate

A = anode (+)

Silicon-controlled rectifier


1 EC103D SCR


C = cathode (-)

G = gate

A = anode (+)

IC555 timer

1 556 timer

555 timer pins

Note the location of pin 1 relative to the notch on the IC.

LM386 amplifier

1 555 timer

LM386 pins

Note the location of pin 1 relative to the notch on the IC.

PS2501 optocoupler

2 PS2501 optoisolator

A white dot on the IC marks the location of pin 1.

8-pin socket 3 8-pin socket  

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 label

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

Drilling template 1 template 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
3/4-in standoffs 4 Standoffs  

1/4-in 4-40 bolts


6 Bolts  

1/4-in 4-40 bolts


2 Bolts  


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  

Toggle switch


2 SPDT switch (red)  
Pushbutton, momentary, normally open 1 pushbutton switch  
RCA panel jack 2 RCA panel jack Output jacks
3.5mm mono panel jack 2 3.5mm mono panel jack Input jacks
3.5mm stereo panel jack 1 3.5mm stereo panel jack Ouptut jack for camera
10 kΩ pot 1 linear taper pot  
Pointer knob 1 knob  
Piezo disc 1 piezo disc deep  

9-V battery holder

(includes hook and loop tape)

1 laydown battery holder  

3/32-in and 3/16-in

heat-shrink tubing

2 in and

3 in

heat-shrink tubing  
3.5mm mono male connector 1 3.5mm stereo plug  
2-conductor cable 3 ft 2-conductor cable  
Pin receptacles 2 Female pins These may be colors other than red and black.
Hookup wire   hookup wire Various lengths of red, blue, green, white, yellow




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