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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.
|
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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