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A control system is needed to control a small shopping center parking lot lighting system and the exterior lighting for the building. The design specifications require that the parking lot lighting and the exterior lighting turn on at dusk automatically. The parking lot lighting should automatically turn off at midnight but the building exterior lighting should remain on until dawn when it is turned off automatically. The system should repeat daily and should not require adjustment for the change in the seasons. Locate and specify an appropriate sensor if it is to operate at 120 vac as an input to a PLC. Create the ladder diagram program to accomplish the specified control.
Consider this follower to be driven by the output of a differential amplifier of gain 100 whose positive-input terminal is connected to the input signal source vs and whose negative-input terminal is connected to the emitters of the follower.
An optical signal from a modulator can be sent to multiple channels by the LCSLM. This; however, requires that the beam size from the AM is adjusted to match the size of the SLM area. Assume that both lenses in an AM setup are identical
A series circuit consists of a voltage source and four resistors (R1=1k-ohm; R2=30-ohm; R3=470-ohm; R4=2k-ohm). The resistor of 1k-ohm has a voltage of V1=3V across its terminals. a) Find the current out of the voltage source.
Determine experimentally the value of a resistor that when placed across the battery will make a measurable change in measured battery voltage. Keep the voltage decrease from open circuit value to 10% or less.
Design a combinational circuit with four inputs, x,y,w, and z, and four outputs: A, B, C, and D. When the binary input value in decimal is 3,5,6,9,10 or 12, the binary output value is one less than the input value, otherwise it is one greater than..
The RS-232 serial port on a personal computer is transmitting 2400-bit/sec data using a polar NRZ line code that has a peak value of 12 V. Assume that binary 1's and 0's are equally likely to occur.
Calculate the electron and hole densities in an n-type silicon wafer (Nd=10^17 cm^-3) illuminated uniformly with 100 mW/cm^2 of red light (Eph = 1.8 eV). The absorption absorption coefficient of red light in silicon is 10^-3 cm^-1.
Estimate the size and weight of an 1970 automobile using 1970 electronics technology which would have the equivalent computational power and electronics a typical 2013 automobile.
What is the maximum number of receptacles permited on a 15A; 120V branch circuit. A 20 A 120 V circuit. How many small appliances branch circuits are required to supply receptacles in the kitchen and dining areas of residences
A square-law modulator for generating an AM wave relies on the useof a nonlinear device. The given figure depicts the simplest form of such amodulator. Ignoring the higher order terms, the input-output characteristics of thediode-load resistor
A 440-V three-hase Y-connected synchronous motor has a synchronous reactance of 1.5 ohms per phase. The field current has been adjusted so that the torque angle is 28 degrees when the supplied power to the motor is 90kW.
A single, common-anode, 7-segment LED is connected to the Arduino Connector J1 through current-limiting resistors. The diagram in Figure 1 shows the mapping of the pins of the connector to the pins of the 7-segment.
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