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Looking over this book, I realized that there are some topics that are important for you to understand as you work through the material that I have presented here. In this appendix I have provided you with a review of the basic electronic components and the test equipment that you will need to validate and debug your applications.

The two basic devices in any circuit are the power supply and the load. The power supply provides an electron source with the electronics given a speci c voltage potential for a maximum rated current. Voltage can be either unchanging (direct current or dc) or changing (alternating current or ac) according to a sine wave above and below 0 V. The symbol used for power will be the battery symbol shown in Fig. D.1, with the positive terminal connected to Vcc (or Vdd for CMOS devices such as the PIC microcontroller). The negative terminal is connected to ground (GND) (or Vss for CMOS). The battery symbol is meant to represent the multiple plates in a physical battery; I always remember positive because the symbol kind of looks like an actual cylindrical radio battery with the small ground (which is positive in the physical device) connected backwards. A resistor can characterize the load that in a device that impedes current ow through a circuit. Its symbol is shown in Fig. D.2. Resistors are not polarized and normally have a series of four or ve color bands printed on them. These bands are used to specify the resistance of the circuit using the formula

Table D.1 lists the values for each band and what they mean in the resistor speci cation formula. Variable resistors or potentiometers are used to change the resistance of a circuit or to provide a user-selected voltage. Its symbol is shown in Fig. D.3. Pushbuttons normally are referred to as momentary-on or momentary-off switches, and their symbols (i.e., operation) are shown in Fig. D.4. Momentary-on switches close the circuit when they are pressed and open the circuit when they are released. Momentary-off work in the opposite manner, with the circuit opened when the button is pushed. Slide switches are used to make a speci c contact based on the position in which the switch is left. The most basic switch has one or two throws that result in a closed circuit. Figure D.5 shows single- and double-throw switches. There can be more than one throw, or position, in the switch, and multiple switches can be ganged together as multipole switches. There are many different combinations that can be built out of these basic types of switches. In this book I am mostly concerned with single-pole, single-throw switches (which are known as SPST) for turning on and off power or to control basic signals. The symbol for the SPST is shown in Fig. D.6. You will have to wire multiple boards together, and this is accomplished by the use of connectors. There seems like there are an in nite variety of connectors available. In many cases, the application developer selects the connectors that he or she feels most comfortable with. For this reason, except for some very speci c instances where high current or convenience is required, I have not speci ed the type of connector to be used. The connector symbol name is J.

100 10

1 2 3 4 5 6 7 8 9 1 2

N/A 1% tolerance 2% tolerance N/A N/A 0.5% tolerance 0.25% tolerance 0.1% tolerance 0.05% tolerance N/A 5% tolerance 10% tolerance