IC RADIO PARTS
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This chapter will discuss about radio receiver with IC. IC (Integrated Circuit) is an electronic component that includes one or more integrated circuits. On the IC you will find several parts that function as transistors, diodes, and resistors. Th...
This chapter will discuss about radio receiver with IC. IC (Integrated Circuit) is an electronic component that includes one or more integrated circuits. On the IC you will find several parts that function as transistors, diodes, and resistors. Therefore the function of the transistor on the radio receiver can be replaced by an IC so as to produce a radio receiver circuit that is simpler but has better wave reception capabilities.
Radio with IC has the same parts as a six transistor radio, namely as follows.
5. MF amplifier
7. AF amplifier
8. Final amplifier
9. Sound tools
10. Source of electric current
The block schematic of a radio receiver circuit with IC can be seen in Figure 7.1.
The receiving antenna is a part of a radio set that functions to receive radio frequency waves and forward them to the radio receiver. There are two types of radio receiving antennas, namely rod antennas and horizontal antennas.
Rod or Vertical Antenna
The position of the rod antenna is standing upright (vertical) so that it is able to capture radio frequency signals from all directions. An antenna that can pick up radio waves from all directions with equal strength is called an omni directional antenna.
Horizontal antenna is an antenna that is installed horizontally or transversely. There are two types of antennas that are mounted horizontally, namely wire stretch antennas and ferrite rod antennas.
Wire-span antennas are made of stainless wire that readily picks up radio waves, such as copper wire. The ferrite rod antenna is an antenna which is wound by an enamel wire as a coil. Both types of antennas are capable of capturing radio wave signals coming from the direction perpendicular to the antenna axis. However, it is very weak to pick up a wave signal (parallel to the antenna span.
If the location of the radio set is not right, the radio broadcast from the station in the transmitter will not be clearly heard on the receiver.
TUNING (TUNING CIRCLE)
Tuning section or tuner circle is part of radio receiver which functions to select one of the radio wave signals that can be captured or received by the antenna. This section consists of a varco and a ferrite rod-core antenna spool. The tuning section or tuner loop works by resonating the waves received by the receiving antenna. Resonance will occur when the frequency of the wave signal and the frequency of the tuning part are the same. The same frequency value is obtained by varying the varco value.
The oscillator is part of a radio receiver that functions to generate high frequency or frequency oscillators (FO / Fr 'quenc Oscillator). The amount of vibration or frequency generated by the oscillator must be 455 kHz greater than the transmitter frequency selected by the tuning or tuner. The oscillator frequency and transmitter frequency will then meet and change in the mixer section.
This section consists of an oscillator coil consisting of the primary and secondary coils.
The mixer section serves to mix the transmitter frequency and the oscillator frequency. The mixing between these two frequencies will produce a weak middle frequency with a value of 450 kHz - 500 kHz. To get a simpler circuit, it is necessary to make a circuit that combines a mixer with an oscillator called a converter circuit.
PENGUAT MF (MIDDLE FREQUENCY)
The MF (Middle Frequency) or IF (Intermediate Frequency) amplifier is a part of a radio receiver that functions to amplify the intermediate frequency from the mixer to an intermediate frequency with a higher value.
Detector is a part of a radio receiver that functions to separate sound frequency and carrier frequency. The sound frequency (audio) will be transmitted to the sound amplifier through the capacitor, while the carrier frequency is discharged to ground through the junction capacitor. The detector part consists of a rectifier circuit and a low pass filter circuit. The sound produced by the detector is still very weak, so it needs to be amplified by a sound amplifier.
A sound amplifier or AF (Audio Frequency) amplifier is a part of a radio receiver that functions to amplify weak sound frequencies from the detector into strong frequencies. Consider Figure 7.2.
The sound frequency that comes out and the sound amplifier is not strong enough, so that it is not able to vibrate the loudspeaker. To produce a frequency that is stronger and capable of vibrating the loudspeaker, the radio receiver circuit must be equipped with a final amplifier. Consider Figure 7.3.
The sound tool or loudspeaker converts the electrical vibrations of sound into sound vibrations. Sound tools work on the principle of gay a magnet. The magnetic force acting on the voice instrument comes from a speech coil consisting of a permanent magnet and two coils, coil a and coil b. Permanent magnets have fixed poles, while coil a and coil b each have two poles, a north pole and a south pole. If coil a is north pole, coil b is south pole and vice versa. Look at Figure 7.4.
How the voice instrument works can be explained as follows. Suppose a permanent magnet has a north pole (coil b has a south pole). If one day coil a is north pole, coil a will be repelled or pushed to the right approaching coil b by a permanent magnet or when pulled to the right by coil b. After that coil a is turned south, so coil a will be repelled by coil b or coil a is attracted by a permanent magnet. This movement is continuous, so the speech scroll moves quickly left and right. This movement is followed by the movement of the pear and membrane, causing vibrations. The number of vibrations that arise depends on the rhythm that enters the legs of coil a and coil b, so that the sound that comes out of the loudspeaker sounds like the original sound.
SOURCE OF ELECTRIC FLOW
In general, the source of the electric current used in the IC radio receiver circuit is an ants DC (direct current) electric current. But nowadays, by installing a series of adapters on the radio set, the radio can be supplied with AC power.
RADIO IC COMPONENT TESTING
Material in this Chapter:
A. Open Relationship Testing
B. Testing Grounding Radio IC
OPEN RELATIONSHIP TESTING
Diode Testing The test steps...
PREPARATION OF TOOLS AND MATERIALS
Materials for making an IC radio receiver can be seen in Figure 8.1 below.
List of components:
R1, R7 = 470 K resistance
R2 = 180 K r...
TESTING THE SIX TRANSISTOR RADIO COMPONENTS
OPEN RELATIONSHIP TESTING THE SIX TRANSISTOR RADIO COMPONENTS,
Testing the open relationship of each six transistor radio component is a pro...
MAKING SIX TRANSSISTOR RADIO
Learning Objectives: After studying this chapter, you should be able to:
• describes the process of making a six transistor radio;
• make a six...
SIX TRANSISTOR RADIO PARTS
A. Receiving Antenna
D. Microphone Tool Sound (Loudspeaker)
E. Amplifier MF (Middle Frequency) Electric Current Source...
TESTING THREE TRANSISTOR RADIO COMPONENTS
A. Testing of Fixed Resistors
B. Testing of Paper, Mica, and Cramp capacitors
C. Testing of Electrolytic Condensers
D. Testing Diode...
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