Component and Tools
The lecture notes by Barry Mapen were written many years ago but are still very helpful to many students in CSE210W.
We also have multi-meters and Logical Analyzers in the lab. Ask TA if you need to use these tools.
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Protoboard Please pay attention to the videos that demonstrate how to remove a chip from a protoboard. |
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7-Segment LED |
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SIP (Single In-line Package) resistors are constructed to fit into the 0.1-inch pitch of holes in a protoboard and a printed circuit board (PCB). They are a condensed way of constructing a number of resistors with a common contact. All of the resistors, which will be of the same nominal value, are connected to one pin. This pin will be marked in some way to indicate which one it is. The resistors will have a maximum power dissipation of typically 200 mW. |
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The switch block shown in the picture comprises 8 separate single-pole, single-throw (SPST) switches. This means that across each pair of pins there is a simple switch that either connects the pins together or provides no contact. It is usual to refer to a closed, or short, circuit as ON and an open circuit as OFF. 'ON' and 'OFF' imply no and infinite resistance respectively. However, as engineers, we recognize that nothing is perfect and that we should accept that a closed switch has a very low resistance sometimes referred to as contact resistance. An open switch has essentially infinite resistance but there will always be some leakage particularly if we are considering time-varying signals. For our steady-state, DC situation, we assume no leakage. |
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Resistor Another page about resistor [PDF]. |
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Ribbon cables are used to connect many signals from one part of a circuit to another in a neat and reliable way. They can vary in the number of wires they include. They are normally terminated by DIL (Dual In Line) connectors and there is an indication of polarity on the cable itself. They provide flexibility for boards that have to be moved relative to each other and can sometimes be seen folded horizontally around a right angle as well as freely hanging between component boards. |
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Banana plugs are designed to plug up the holes in bananas created by the Mediterranean banana weevil. However they are also very good as electrical connectors, providing an excellent, low-resistance, and mechanically good connection for power supplies. They are not usually used for the sort of TTL signals we work with though they would be used for industrial situations, for example, where the cables were expected to carry higher currents. |
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Logic Probe |
