vb.net barcode reader source code VR1 = 12V 5.1V = 6.9V R = V / i = 6.9 V / 0.100 A = 69 in Software

Drawer QR in Software VR1 = 12V 5.1V = 6.9V R = V / i = 6.9 V / 0.100 A = 69

VR1 = 12V 5.1V = 6.9V R = V / i = 6.9 V / 0.100 A = 69
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The closest standard resistor value you can get is 68 , which will result in 101 mA being available for the load. With this value in hand, you can now calculate the power being dissipated by the resistor, using the basic power formulas:
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Power = V i = 6.9 V 0.101 A = 0.7 Watts
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Standard resistor power ratings are in 1 8, 1 4, 1 2, 1, 2, and so on watts. A 1-W, 68 resistor would be chosen for this application. The zener diode will also be dissipating power; how much is something that you should decide. To err on the side of safety, it is recommended that you assume that the zener diode can have 100 percent of the load current passing through it (when the load circuitry is not attached to the power supply). The power rating for the zener diode is calculated exactly the same way as R1:
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Power = V i = 5.1 V 0.101A = 0.52 Watts
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For this application, you could probably get away with a 1 2 W rated zener diode along with the 1 W rated 68 resistor. Working with zener diodes to make power supplies is quite easy, but there is a tremendous price to pay in terms of lost power. In this example, the total power dissipated will be 1.2 W, with 58 percent of it being dissipated through the R1 resistor. This loss may be unacceptable in a battery-powered robot.
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BATTERIES AND ROBOT POWER SUPPLIES
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17.10.2 LINEAR VOLTAGE REGULATORS
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The zener diode regulator can be thought of as a tub of water with a hole at the bottom; the maximum pressure of the water squirting out is dependent on the level of water in the tub. Ideally, there should be more water coming into the tub than will be ever drawn to ensure that the pressure of the water coming out of the hole is constant. This means that a fair amount of water will spill over the edge of the tub. As was shown in the previous section, this is an extremely inefficient method of providing a regulated voltage, as the electrical equivalent of the water pouring over the edge is the power dissipated by R1. To improve upon the zener diode regulator s inefficiency, a voltage regulator that just lets out enough current at the regulated voltage is desired. The linear voltage regulator only allows the required current (at the desired voltage) out and works just like a car s carburetor. In a carburetor, fuel is allowed to flow as required by the engine if less is required than is available, a valve closes and reduces the amount of fuel that is passed to the engine. The linear voltage regulator works in an identical fashion: an output transistor in the regulator circuit only allows the required amount of current to the load circuit. The actual circuitry that implements the linear regulator is quite complex, but this is really not a concern of yours as it is usually contained within a single chip like the one shown in Fig. 17-9. The circuit shown here uses one of the most popular linear voltage regulators, the 7805 to regulate a high-voltage source to +5 V for digital electronic circuitry. The parts required for the 7805 based linear regulator are listed in Table 17-1. Two of the most popular voltage regulators, the 7805 and 7812, provide +5 and +12 V, respectively. Other 7800 series power regulators are designed for +15, +18, +20, and +24 V. The 7900 series provides negative power supply voltages in similar increments. The current capacity of the 7800 and 7900 series that come in the TO-220 style transistor packages (these can often be identified as they have no suffix or use a T suffix in their part number) is limited to less than 1 A. As a result, you must use them in circuits that do not draw in an excess of this amount. Other linear regulators are available in a more traditional TO-3-style transistor package ( K suffix) that offers current output to several amps. The L series regulators come in the small TO-92 transistor packages and are designed for applications that require less than about 500 mA. The different packages limit the amount of heat that can be dissipated by the linear regulators and determine how much current they can source.
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Positive Supply Rail (from Battery)
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