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7.8.2 TIPS TO REDUCE STATIC
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Consider using any and all of the following simple techniques to reduce and eliminate the risk of electrostatic discharge.
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Wear low-static clothing and shoes. Your choice of clothing can affect the amount of static buildup in your body. Whenever possible, wear natural fabrics such as cotton or
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7.9 GOOD DESIGN PRINCIPLES
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wool. Avoid wearing polyester and acetate clothing, as these tend to develop large amounts of static. Use an anti-static wrist strap. The wrist strap grounds you at all times and prevents static buildup. The strap is one of the most effective means for eliminating electrostatic discharge, and it s one of the least expensive. Ground your soldering iron. If your soldering pencil operates from AC current, it should be grounded. A grounded iron not only helps prevent damage from electrostatic discharge; it also lessens the chance of receiving a bad shock should you accidentally touch a live wire. Use component sockets. When you build projects that use ICs, install sockets first. When the entire circuit has been completely wired, you can check your work, then add the chips. Note that some sockets are polarized so the component will fit into them one way only. Be sure to observe this polarity when wiring the socket.
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7.9 Good Design Principles
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While building circuits for your robots, observe the good design principles described in the following sections, even if the schematic diagrams you are working from don t include them.
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7.9.1 PULL-UP RESISTORS
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When a digital electronic chip input is left unconnected or floating, the value presented at the input is indeterminate. This is especially true for CMOS chips, which use the gates of MOSFET chips as inputs (TTL inputs are automatically high when inputs are left floating). To ensure that the inputs values are a known value, a pull up should be used or, if the input must be low during operation, then an inverted pull up (shown in Fig. 7-8) should be used. Pull-down resistors on logic inputs should be avoided because of the low resistance (less than 150 ) required to ensure TTL inputs are at a low value. To raise the input to a high value, a high-current source must be applied to the input pin to overcome the pull-down resistor. The pull-up resistor can be a relatively high value (10k or more) to minimize any possible power drain and allow simple changes to logic without large current flows.
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7.9.2 USE BYPASS CAPACITORS
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Some electronic components, especially fast-acting logic chips, generate a lot of noise in the power supply lines. You can reduce or eliminate this noise by putting bypass (so-called decoupling) capacitors between the +V and ground rails of all chips as close to the power supply pins as possible, as shown in Fig. 7-9. Suggested values are 0.01 F to 0.1 F. If you are using polarized parts, be sure to properly orient the capacitor.
7.9.3 KEEP LEAD LENGTHS SHORT
Long leads on components can introduce noise in other parts of a circuit. The long leads also act as a virtual antenna, picking up stray signals from the circuit, from overhead light-
ELECTRONIC CONSTRUCTION TECHNIQUES
Optional Switch Tying to Ground
Output of Inverter is Low due to Pull Up Resistor
Logic Output
FIGURE 7-8 When an input has to be held low, use an inverted pull up as shown here. This will allow easy logic level changing for circuit test.
ing, and even from your own body. When designing and building circuits, strive for the shortest lead lengths on all components. This means soldering the components close to the board and clipping off any excess lead length, and if you are breaking any connections cut the wires or PCB traces as close to the chip pin as possible.
7.9.4 AVOID GROUND LOOPS
A ground loop is when the ground wire of a circuit comes back and meets itself. The +V and ground of your circuits should always have dead ends to them. Ground loops can cause erratic behavior due to excessive noise in the circuit, which can be very difficult to track down to a root cause.
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