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Fifteen: Induction Loop Receiving System
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Figure 15-1 Induction loop communications system block diagram
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You can easily build your own induction loop communication system First we will begin by describing the transmitter section of the system, as shown in Figure 15-2 In its simplest form an induction loop transmitter can consist of a mono or stereo Hi-Fi receiver, a resistor and a large loop coil placed around the perimeter of a house, room, or your easy chair If you have a stereo receiver with a speaker output A-B switch, you can select the (B) output for your induction loop system You would place an 8 ohm, 10 watt resistor across the output of the left channel s output and then place an 8 ohm, 10 watt resistor in series with a large loop coil as shown When you wanted to use the induction loop system, you would switch to the (B) speaker output; it s that simple
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If you wanted to construct your own amplifier specifically for an induction loop audio system, you could utilize the 6 to 10 watt audio amplifier shown in Figure 15-3 In order to drive an induction loop, you would need an amplifier with at least about 5 watts of power or more to have a workable system The amplifier shown in this diagram would work just fine for driving a large loop coil An audio input signal is fed into the audio input section at the point marked (A) on the schematic Your audio source could be adjusted via the potentiometer at R1 Note, that you may need an additional pre-amp ahead of the amplifier if you use a low output microphone You can feed a radio or TV signal directly into the potentiometer at R1 to drive the induction loop transmitter The audio amplifier module shown is an 8 watt National Semiconductor LM2002 module, but you could also use a higher power module such as their LM2005 The output of the audio amplifier is wired in series with an 8 to 10 ohm, 10 watt
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Figure 15-2 Induction loop transmitter I
Fifteen: Induction Loop Receiving System
+6 12 V DC Audio input 5 (A) R1 C1 + 1 C4 + 2 3 R3 R4 + U1 4 R2 C6 + C5 C2 C3 +
R5 Loop coil
Figure 15-3 Induction loop transmitter II
resistor in order to drive the coil This resistor also protects the output of the audio amplifier The inductive loop is a winding of wire through which an audio signal passes, which creates a field within which the audio signal can be detected by appropriate equipment, either a telecoil in a hearing aid or an induction loop receiver The loop coil is basically a simple 4 or 5 turn loop placed around the room fed from an audio amplifier The loop then converts the sound to a magnetic field that can be received by a second loop coil and amplified Note that more turns in the transmission coil result in a stronger transmitted signal The loop should have a DC impedance of at least 8 ohms, or you can add a resistor in series with the coil to reach 8 ohms Pick a path around the room on the ceiling, or under the carpet A room measuring 15 20 will have a perimeter of 70 , which will require a minimum of four complete turns of 22 gauge wire, six turns of 20 gauge wire, or nine turns of 18 gauge wire Pick a path around the room near the ceiling, and wind (or hang) your coil, or loop, starting and ending at the amplifier If the back of your amplifier says something like 8 ohms minimum, double the required wire length (load) Buy 120% of the wire you ll need to ensure that you can complete the loop You should add a power resistor to ensure an appropriate load and reduce wire length, but the amplifier output will be divided between the loop and the resistor, proportionately, which means less radiated energy This solution requires a lot of energy so try not to compromise If required, get 4 ohms
at 10 watt minimum There s another and simpler approach: I have a coil built into my favorite chair It s only 18 in diameter, but includes 120 of 28 gauge wire (0071 ohms per foot) That s about 25 turns of that relatively thin wire Another approach to constructing a large loop is to take a long length of 25 pair telephone cable Inside Wire that s long enough to go around the perimeter of a room Then get a 66 block (or some other kind of punch down block) and punch down the wires so they connect in a multiple turn loop In this way you can add or subtract turns as you wish if you need that later You could tack this telephone cable to the ceiling of the basement underneath the room you choose Connect either end of the loop coil wire to the plus (+) or red terminal and the other end to the minus ( ) black terminal, on the audio amplifier s speaker terminals Most amplifiers or stereo receivers have SPEAKER A and B switches; put your coil circuit on the unused output (B) Remember to place an 8 to 10 ohm, 10 watt resistor in series with the speaker output and the coil loop windings
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