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TEMPERATURE/VOLTAGE LEVEL MODULE KIT 303
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you have decided whether you wish temperature or voltage level sensing, you can insert the input resistors S1/R2 or the scalers. The TVL board can now be inserted into the 10-pin female header on the main Tele/Page-Alert board. Note that the components on both circuit boards should face each other when connected together.
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Listen-In Module Kit
The listen-in module kit allows you to listen in to the room or area being monitored by the Tele-Alert alarm controller (Fig. 22-7). The listen-in board can be used only with the Tele-Alert system board. With the listen-in board you can listen in for up to 2 minutes after you have been called by the Tele-Alert unit. The circuit for the listen-in board is shown in Fig. 22-8.
BASIC COMPONENTS
The listen-in board, begins with the sensitive electret microphone at MIC. The sensitive electret microphone is first biased via R1, which is enabled via the microprocessor. The sound output from the electret microphone is coupled through C1 and R2 to the dual opamp at U1:A, which acts as an audio preamplifier. The LM358 op-amp at U1 is a singlesupply device, thus eliminating the need for the usual two power supplies used with most op-amps. The gain of U1 is essentially controlled by resistors R3 and R6. The output of the first preamp stage is next coupled to the second amplifier stage at U1:B, via C2 and R5. The output of the second audio amplifier stage at U1:B is coupled directly to the telephone coupling transformer T1 via C3. The listen-in board kit is powered by the 5-V system power source through the main Tele-Alert board.
304 INPUT SENSOR MODULES
Figure 22-7 Listen-in module kit.
Enable 9V R1 M R2 C1 R4 9V C4
R3 R6
C2 R5
U1:A
U1:B
C3 Output
R7 Figure 22-8 Listen-in board circuit.
CONSTRUCTING THE MODULE
The listen-in board kit measures 2 by 11 4 in. It was designed to easily plug into the Tele-Alert. The listen-in board is simple to construct, and can be completed in about a half-hour or so. Locate all the components and display them in front of you. Begin first by installing the resis-
LISTEN-IN MODULE KIT 305
tors, followed by the capacitors. When constructing the kit, be sure to carefully observe the polarity of the capacitors and the integrated circuits before placing them on the circuit board. Integrated circuits are generally marked by an indented recessed circle or a square notch at the top of the chip. Usually the top left pin closest to the circle or notch is pin 1. Integrated circuit sockets are used to facilitate component changes in the event of a later problem. The electret microphone has two leads, which first must be identified before placing it on the circuit board. One lead is fastened to the case or body of the microphone, and this is the ground lead. The listen-in module contains a single in-line row of 10 male header pins at one edge of the circuit board, which allows the board to connect to the main Tele-Alert board. The first of the 10 pins begins with the 9-V supply at pin 1 followed by the system ground connection at pin 2. Many of the solder pads are not used except for the power pins, the audio output at pin 8, and the audio enable connection at pin 7. The 10-pin male header is inserted and soldered on the foil side of the circuit board, once the board has been completed. Both circuit boards should have the components facing upwards when connected together and finished. Table 22-4 lists the pinouts. Once completed, the listen-in board can be tested, by applying a 5-volt source to the two power pins, system ground at P1-2 and 5 volts at P1-9. You can then connect a headphone to the output pin P1-8 and ground, and apply 5 V to the enable pin at P1-7, in order to activate the electret microphone. You should now be able to hear room sounds in the headphone, and the listen-in board is now complete and ready to use.
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