What is the role of an antenna on a wireless device?
A. it helps tune to a frequency
B. it demodulates a signal
C. it serves as a ground signal
D. it transmits and receives data
Answer: D
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The minimum turning radius for a driveway should be 14'.
Answer the following statement true (T) or false (F)
Young litters of hamsters should be separated at five or six weeks, not only to prevent fighting, but also to prevent unwanted ____________________
Fill in the blank(s) with correct word
A device that, when inserted in a receptacle, establishes a connection between the conductors of the attached flexible cord and the conductors connected permanently to the receptacle is called a(n) "_____."
What will be an ideal response?
The circuit shown in Figure P10.25 is a 9-V battery charger. The purpose of the Zener diode is to provide a constant voltage across resistor R2, such that the transistor will source a constant emitter (and therefore collector) current. Select the values of R2, R1, and VCC such that the battery will be charged with a constant 40-mA current.
Known quantities:
The circuit of Figure P10.25: IC = 40 mA; Transistor large signal parameters.
Find:
Design a constant-current battery charging circuit, that is, find the values of VCC, R1, R2 that will cause the transistor Q1 to act as a 40-mA constant current source.
Assumptions:
Assume that the transistor is forward biased. Use the large-signal model with ? = 100.