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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.

SPACE(integer_expression) REPLICATE(character_expression, integer_expression)

Figure 5-3.

- 262 -

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.

Figure 5-4.

select SPACE(4) + REPLICATE('*', 8)

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-

ON DELETE CASCADE, CONSTRAINT TAKENBY FOREIGN KEY (REP) REFERENCES SALESREPS ON DELETE SET NULL, CONSTRAINT ISFOR FOREIGN KEY (MFR, PRODUCT) REFERENCES PRODUCTS ON DELETE RESTRICT) Figure 13-2 shows the three relationships created by this statement and the names it assigns to them. In general it's a good idea to assign a relationship name, because it helps to clarify the relationship created by the foreign key. For example, each order was placed by the customer whose number appears in the CUST column of the ORDERS table. The relationship created by this column has been given the name PLACEDBY.

This statement returns a useless result, but then, these functions were used at one time primarily to format output:

-----------********

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.

Use the STUFF function to stuff a string:

When the DBMS processes the CREATE TABLE statement, it checks each foreign key definition against the definition of the table that it references. The DBMS makes sure that the foreign key and the primary key of the referenced table agree in the number of columns they contain and their data types. The referenced table must already be defined in the database for this checking to succeed. Note that the FOREIGN KEY clause also specifies the delete and update rules that are to be enforced for the parent/child table relationship that it creates. Delete and update rules, and the actions that can trigger them, are described in 11. The DBMS enforces the default rules (NO ACTION) if no rule is explicitly specified. If you want to create two or more tables from a referential cycle (like the OFFICES and

STUFF(character_expression1, start, length, character_expression2)