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Suit Communication System

 
 
While suited, it is hard to communicate verbally because of the encapsulating nature of the suit. It is often difficult to hard-wire a communications system because most suits do not feature air inlets, and on those that do, they are often small, making it difficult to pass communications cables through them. The best method to communicate while suited is via radio. Below is a simple circuit that will transmit audio over the standard FM band receivable by most radios. Not only can you use this circuit to communicate with other humans while suited, you could also use it in conjunction with computer voice recognition software to control events in your lab, like I do. It is a really simple circuit to build, if you have any knowledge of electronics it should only take you about ten minutes to build once you have the parts.

fmtransmitter.jpg

Part

Total Qty.

Description

Substitutions

C1

1

0.001uf Disc Capacitor

 

C2

1

5.6pf Disc Capacitor

 

C3,C4

2

10uf Electrolytic Capacitor

 

C5

1

3-18pf Adjustable Cap

 

R1

1

270 Ohm 1/8W Resistor

270 Ohm 1/4W Resistor

R2,R5,R6

3

4.7k 1/8W Resistor

4.7K 1/4W Resistor

R3

1

10k 1/8W Resistor

10K 1/4W Resistor

R4

1

100k 1/8W Resistor

100K 1/4W Resistor

Q1, Q2

2

2N2222A NPN Transistor

2N3904

L1, L2

2

5 Turn Air Core Coil

 

MIC

1

Electret Microphone

 

MISC

1

9V Battery Snap, PC Board, Wire For Antenna

 

 

 

All up, These parts should only cost around $10.00, so its perfect for HAZMAT enthusiasts on budgets.  If you are into electronics as a hobby, you probably have most of the parts you need already in your parts bin.

 

Simply replace the microphone with a 3.5mm jack and connect an old computer headset to allow for easy communications. If you are going to be using this circuit in conjunction with a respirator mask, you may be able to fit a electret microphone into the mouth cup. If I am able to wire a mic up to my mask I will certainly take photos and write up a description.

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