The pre amplifier circuit for playing back a tape recorder using three ICs TL 074 / TL 084
Uploaded by: Kylie
On: 29 Nop, 2020
Viewed:150 times - 3 hour, 22 minute, 37 second ago
Downloaded: 0 times -
In the audio amplifier section, this amplifier consists of a group of circuits where the circuits support each other, so that there is good cooperation from the entire group of these circuits to produce really good audio quality. As for the parts ...
In the audio amplifier section, this amplifier consists of a group of circuits where the circuits support each other, so that there is good cooperation from the entire group of these circuits to produce really good audio quality. As for the parts of each audio amplifier as shown below.
1. Audio amplifier
2. Pre amplifier
3. Buffer amplifier
4. Driver amplifier
5. Final amplifier
I. AUDIO AMPLIFIER
Amplifier In a good audio system that has been developed at this time is an audio system which is better known as a Hi-fi system which consists of two devices that are exactly the same. The input section is equipped with a selector that can be used with a variety of different input signals, such as tape recorders, radios, microphones and so on. For more details about the audio amplifier system, consider the block diagram image below.
In the block diagram image above where the first part is called the pre amplifier or what is usually called the pre amp. With this circuit it makes it easy to select various input signals according to needs and strength before being entered to the next level. While the second part is tone control and volume control. This section functions to adjust the frequency or amplitude characteristics of the audio signal. Likewise, the construction of this section uses various additional circuits such as mixers, as well as a variety of audio filters required. Whereas in the last section it is called a power amplifier, in this section there are many choices ranging from those that produce hundreds of milli watts of power to hundreds and thousands of watts. But with that overall the audio amplifier has been designed in such a way as to be able to produce low noise (noise), as well as a good protection system against overvoltage or load. From the three sections above, you get a DC voltage source that is quite good and even, and so it really produces good audio quality.
And for the development of good audio mutti continues to this day, and for a series of block diagrams, it does not only use three parts of the block but can be more than three block diagrams. And all of this aims to produce good sound quality.
The initial amplifier or what is usually called the pre amplifier is the initial sound source part or the initial audio part which will later be entered into the input section of the power amplifier circuit. For the pre amplifier, it can be divided into several parts which include: I. Pre amplifier for playing back tape recorders 2. Pre amplifiers for microphones 3. Pre amplifiers that come from radio transiators.
II.1 Pre amplifier for playing back tape recorders. The pre amplifier for playing back tape recorders or what is commonly said with the pre amp head, this is the initial amplifier part that comes from the tape recorder which functions as the main amplifier against the weak sound signal coming from the tape recorder head. In order for the amplified sound signal to be pleasant to hear, the pre amp head must be designed and made so that it produces sound frequencies that are pleasant to hear. In the following section there is an example of a pre amplifier for playing back tape recorders made of IC (Integrated Circuit) circuits. In the pre amp head circuit that uses this IC in the experiment it produces excellent audio quality, because the noise and hum are almost invisible. For more details about the pre amplifier circuit for playing back tape using this IC, consider the following circuit.
Figure 2.2 Pre amplifier circuit for playing back a tape recorder using three IC TL 074 / TL 084.
List of components: Rl = 100 K ohms
R17 = 560 K ohms
R2,3,4 = 1 K ohms
R20 = 6.8 K ohms
R6,7,8,9 = 68 K ohms
Cl = 1.5 nf R10,11, 12,13,14 = 47 K ohms
C2 = 10 pf / 50 volts
R15,19 = 10 K ohms
C3 = 5,6 nf
R16,18 = 12 K ohms
IC 1,2,3 = TL 074 / TL 084
In the schematic image of the pre amplifier for playing back a tape recorder above, the input is connected directly to the tape recorder head and assembled together with the tape mechanic. The tape recorder body is installed with a tape recorder mechanical bolt, the negative (-) closed middle leg part of the pre amplifier frame for playing back tape must be connected to the mechanical metal frame of the tape recorder so that the sound produced is very clean, while the mechanical iron frame is installed with screw to the chassis of the tape recorder box. Thus any disturbance to the sound, be it noise (wheezing) or buzzing sound produced by the power amplifier can be kept to a minimum. And for this circuit using a dual DC voltage source (symmetrical), namely the voltage source which is positive (+), negative (-), grounding (+). The dual DC voltage source circuit (symmetrical) as shown in the following figure.
List of parts: T R2 R1,2 = 2 K ohms ZD 1,2 = 12 V C1,2 = 1000 gf / 25 Volt Tr 1 = 2 SC 1061 C3,4,5,6 = 100 0716 Volts Tr 2 = 2 SA 671 D1,2,3,4 = 1 N 4001 Transformer = 15 Volt CT 500 mA
Figure 2.3 Dual DC voltage source circuit (symmetrical) with 12 Volt output.
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...
MAKING THREE TRANSISTOR RADIO
Learning Objectives: After studying this chapter, you should be able to:
• describes the process of making a three transistor radio;
TRANSISTOR THREE RADIO PARTS
B. Tuning (Tuner Circle)
D. Sound Amplifier
E. Final Brace
F. Sound Tool (Loudspeaker)
G. Source of electri...
As the fastest growing demand of circuit and wiring diagram for automotive and electronics on internet based on different uses such as electronic hobbyists, students, technicians and engineers than we decided to provide free circuit and wiring diagram base on your needed.
To find circuit and wiring diagram now a day its easy. E-learning through internet as a right place to search an exact circuit and wiring diagram of your choice and it's much fun and knowledgable. On internet you will find thousands of electronic circuit diagrams some are very good designed and some are not. So you have to modify them to make them according to your needs but some circuits are ready to make and require no changes.
There are many categories of circuit and wiring diagrams like automotive, audio circuits, radio & RF circuits, power supply circuits, light circuits, telephone circuits, timer circuits, battery charger circuits etc. There are many types of circuit and wiring diagrams some are very easy to build and some are very complicated, some are so small and some contain huge list of parts.
We provides free best quality and good designed schematic diagrams our diagrams are free to use for all electronic hobbyists, students, technicians and engineers. We also provides a full educational system to students new to electronics. If you are new to electronics you are a student or a electronic hobbyist and want to increase your knowledge in electronics or want to understand electronics in a very easy way so this is the right place for you we provide electronics beginner guide tutorials to easily understand complicated electronic theory. Our mission is to help students and professionals in their field.