The pre amplifier circuit for playing back a tape recorder using three ICs TL 074 / TL 084

The pre amplifier circuit for playing back a tape recorder using three ICs TL 074 / TL 084

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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.

audio amplifier section
Figure 2-1

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.


PRE AMPLIFIER
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.

pre amplifier circuit for playing back a tape recorder using three ic tl 074 tl 084

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

dual dc voltage source circuit (symmetrical) with 12 volt output


Figure 2.3 Dual DC voltage source circuit (symmetrical) with 12 Volt output.

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