The document describes how a television remote control works. It begins by explaining that remote controls have replaced manual buttons, allowing users to change channels and control sound and picture with just buttons. It then provides details on the components and processes within the remote control itself. When a button is pressed, it completes a circuit that sends a signal to a microchip. This chip then sends pulses to a light-emitting diode (LED) that flashes an infrared beam to the TV receiver. Diagrams and a flowchart are used to illustrate these steps.

1. JOHAN SEBASTIAN PALOMINO URBANO

2.  Which television and video recorder controls are operated by remote
control buttons whith these symbols:

3. Read paragraph 1 of this text. How many of these controls you identified
in task 1 named in the text?
 The widespread of television remote control units has turned the British
into a nation of couch potatoes. Gone are all the fiddly knobs and
butons which once controlled picture contrast, color, brightness, volume,
and so on. Nowadays we can change cannel, adjust the sound and
picture, and call up on a range of services on the teletext systems
with the push of a button.
A useful way to remembering the main points of what we read is to
tansfer the important information into a different form, such as a table or
diagram. In this unit you are asked to tansfer information from a text to
a flowchart. Flowcharts areoften used to describe processes.

4. Now read paragraph 2 to complete the gaps in the flowchart, which
swohs how the remote control transmitter Works.
 The remote control unit contains keys and electronic components similar
to those of a calculator. The keys are connected by a matrix of wires
which cross beneath each individual key. Pressing a key completes an
electrical circuit, and a signal is sent to a microchip which, in turn,
sends a series of on-off electrical pulses to a light emitting diode(LED)
at the front of the handset. A code spelt out by the length and
spacing of these pulses switches on the LED. The LED flashes on
and off to send an infra-red beam to the receiving “eye ” on the
televisión set.

5. You press a key
Completes an electrical circuit
A signal is sent to a microchip
The chip sends on-off electrical pulses to a LED.
These pulses switch on the LED
The LED flashes on and off to send an infra-red beam

6.  Study this flowchart which describes that happens when the signals are
removed from the remote control:
A photodiode picks up rays from the remotte control
It feed them into a decoding microchip
They are interpreted and verified
Your instructions are carried out

7. we can link two stages in the flowchart to show the sequence of events like
this:
 1+2 when a photodiode picks up rays from the remote control, it feeds
them into a deccoding microchip.
 2+3 after it feeds them into the microchip, they are interpreted and verified.
 3+4 once they are interpreted and verified, your instructions are carried out.
The paart of each sentence beginning with a time word – when, after, once – is
called a time clause.
When shows that one stageis followed inmediately by the next stage
After simply shows the sequence of stages -1 comes before 2.
Once emphatizes that one stage is complete beffore the next stage begins.

8. Go back o the flowchart you made in task 3. write the sentences to
link stages 1 and 2, 3 and 4, and 5 and 6, using the time clauses
 1 an 2: When you press a key, completes an electrical circuit.
 3 and 4: After a signal is sent to a microchip the chip sends on-off
electrical pulses to a LED.
 5 and 6: Once these pulses switch on the LED, the LED flashes on
and off to send an infra-red beam.

9. Fill the gaps in this diagram with the help of the text which follows
STAGE FUNCTION
Audio oscillator Geneates the electrical pulses at a
frequency in the upper audio range.
Buffer amplifier Amplifies the pulses to drive the LED.
LED Converts the electrical pulses into pulsed
infra-red radiation directed at the receiver

10.  The block of a simple remote control system is shown in fig. 1. when
the trans mitter is switched on, infra-red signals are sent from the
transmitterto the receiver. Pulsed signals are used to prevent
interference from any constant infra-red background “noise”.
 To obtain these pulsed signals, electricl pulses are first geneated at a
frequency in the upper audio range by the audio oscillator in the
transmitter. They are then amplified by the buffer amplifier to enable
them to drive the light-emitting diode(LED). Finally the electrical pulses
are converted by the LED into pulsed infra-red radiation which is
directed at the receiver. Almost no visible light is emited from the
LED.

11. Fill in the gaps in this diagram with the help of the text which follows.
COMPONENTS FUNCTION
IC1 Oscillator and amplifier
R1,R2 and C2 Set the frequeny of the oscillator
R3 Control the current output of the
amplifier
C1 Decouples the DC supply from the
pulsed output

12. component aspect
(IC1) ne 555
(R1,R2,R3, C1 and C2) resistors and capacitors

13.  In this circuit, both the oscillator and amplifier are combined in a
single chip integrated circuit(IC1). The frequency of the oscillator is set
by the external timing components R1, R2, and C2. The currentout put
of the amplifier is controlled by the resistor R3 which is connected in
series wiith the LED. Decoupling of the DC supply from the pulsed
output of the IC is provided by the electolytic capacitor C1.

14.  Every circuit
 aditR(mobile)
 Electro droid(mobile)

15.  https://www.youtube.com/watch?v=gVr8eLW0-_o
 http://www.shutterstock.com/es/s/capacitor/search.html
 https://learn.sparkfun.com/tutorials/resistors