LM4780 2x60W Power Amplifier
LM4780 2x60W Power Amplifier


LM4780 2x60W Power Amplifier


Here's a 2x60W LM4780 Power Amplifier. LM3886 is very interested in our project was the first project, and were acclaimed. But the feedback we receive from you, from scratch, we knew we should make a complete device. One reason for that, but hard to find and the LM3886 integrated into the original cost of a fact to be taken into consideration. In this project, in which hosts two LM3886 LM4780 integrated with Integration, ie, making a complete amplifier. Advantageous LM4780 is an integrated, cost of both purchase price aşacağından sahtesinin made ​​of forged-not-at least we do not see, but also would have received only two LM3886 price, or even more cheaply. We mean the complete amplifier, pre-amplifier, power amplifier and power supply hosts, ready for use, kutulayıp living room you can put the head in a corner of the device. If your hand if you have preamps or power amplifier, may be helpful in other projects.

LM4780 2x60W Power Amplifier

This project, in general a complete audio amplifier to meet your needs and still maintain our quality standards.

First of all, explain the difference amplifier integrated amplifier that is integrated in the combined, a power amplifier gain is only given to him oranınca signals (usually 10-35) that elevates the speaker is part of a circuit.
Integrated amplifier with the input of one or a few, tone correction circuit in a device. Input signal is provided as needed and raises the input impedance is high.

According to a device that consist of more than one floor of this circuit. Devremiz it is. Roughly consists of three floors;

- Pre-amplifier
- Power amplifier
- Power supply


Used in the design of electronic circuits "at least a minimum of circuit elements of noise" as possible by following the principle of a simple design, low noise, and have made;

Due to the simplicity of op-amp circuit was used. This view includes the circuit diagram for a single channel. Naturally, the circuit of threads used two for stereo. S2 switch to choose between a flat response curve and the pressure response curve can be strengthened. This project, as well as before, and my dear friend Nico RAS LM3886 preamp Linkwitz correction circuit that has been applied to the project. And the amplifier's response curve changes as follows;

As can be seen around the amplifier 8dB gain extra around 25-30Hz have been provided and this is a very small phase shift was obtained. In practice, the loss of small speakers is very good off the correct boxes. However, the potential for a large speaker box users the option of a flat response curve has not been neglected. S2, 6, and No. 3 positions switch allows the flat response curve.
In general, pre-amplifier, 12 dB (3.5 vv) has a gain. This is also very low resources from power amplifier to be used freely.

Why do a ton of control (bass / treble) If the next cycle appended. Baxendal type used in standard practice, cross-linked circuits, carbon potentiometers used in the cross-channel due to the 20% tolerance level and more importantly, aware of tons of lead. On the other hand, such as TDA1524 and LM1036 ICs using a single feature, however, this project will not be available until the pot is bad.
In this way, and both were satisfying bass performance of the system and the sound difference between channels is minimized. In general, the bass-treble control pot is set up to potudur bass. And it has no bass / treble control circuit can not give this performance, because both have a very wide spectrum (50Hz-200Hz) and 25-30 Hz as well as whom a never offered for sale. This circuit is an alternative, or 10 channel graphic equalizer (Equaliser) or a very expensive parametric equalizers. Who knows, maybe we can go in the future encounter with 10-channel graphic Equaliser, but that's the situation right now.
LM833N op-amp used in the National Semiconductors has developed a quality op-amptır for audio applications. However, the same firm that in recent years as an alternative source LM4562 op-amp has produced a better quality. In addition, the company Philips NE5532 and ST can be used instead of the TL072 op-ampları the same integrated. Or take one each ear according to taste best when trying to use one of the circuits.

Pre-amplifier, power amplifier power supply was added in the same chassis to put a little thought. As can be seen from the power supply 18-35V regulated supply to produce symmetrical feeds 15v symmetric and a simple design made for the exclusive purpose. Known covers 7815 and 7915 entegrelerini.

However, the output of our circuit and load as well as stereo audio level pot on a logarithmic potentiometer is used as a 10K health. By the way where I want to touch on the subject of Stock potentiometer;

The first is the volume for the audio circuits, ie, a logarithmic curve used in pots, the reason is simple; audio frequency technique measures the logarithmic (dB) is made and the reason for this rise to the logarithm of the feeling of hearing the human ear. So you remove the volume of the human ear to 20W from 10W hissetmeyecektir it twice. From 10W to 50W, but can you remove this feeling. Naturally as a result, should be logarithmic in the volume potentiometer. Linear pots up and down constantly forced to use the latest levels and reduced sensitivity towards the end that is, the output level you have set a kind of more than 20%.
The second issue is actually the most important and most expensive part of this complete system is that almost potentiometer. Chinese property market in Turkey, unfortunately, linear potentiometers are simple. Take one of the two channels separately, to try and measure them ... I guarantee that at least 20% of the difference. Keep in mind that tolerance is now 20% of carbon potentiometers. And this applies to both channels. This means that a total of 40% can be the difference. Mean difference of 40% resistance level of 40% can be the difference between right and left channel means. Terrible! In practice, though not as bad as it felt quite different, especially at low levels. Cause of hearing fonksiyonumuzdur still logarithmic. However, PIHER, acceptable price, better quality, such as ALPS potentiometers Lara falls to 10% of the difference. For example, type A 10Kx2 ALPS potentiometer used for this project is 5%. Carbon is quite a good figure for a pot. But I recently bought health PIHERlerde 100K difference was almost 15%. Bad, but still cheap Chinese potlarından good.
In the third and most terrifying urban legends on pots, brushes used for cheap Pots cheapness has been undertaken because of poor quality resulting from a mixture of copper-bronze brush gürültüsüdür potentiometer. Thousands of labor-whether in a setting of your amplifier's sound is a kind of kıytırık dokunamamanız friends next to a pot because of a bad situation.

In conclusion, I should say how good he'll get better results if potunuz. I recommend ALPS. How will speak at the Forum can be obtained. As for the price, per pot, remove the need to review at least 10 € yu.

I do not need to explain something extra in the front amplifier. Önyükselteç is a good a good sound.


National's power amplifier using new products as we are used now. Naturally, I would choose this. Applicator friends TDA7294, NGOs and other derivatives of V at the amplifier can XXXX. I can guarantee that only one application, provided that the outcome of the original (Sanyo brand) is STK4048X. Very expensive ($ 25) and only two need to get that channel. Identical goods in Korean NGOs also hollow sound of tin cans! On the other hand many successful applications with TDA7294 and 93 workers who are DIY, but I have not tried and can not guarantee the outcome of the market such as the fact that thousands of fake TDA7294 scares people.

LM4780TA integrated circuit used in this circuit is not intended, however not yet forged. (At least I know it.) Furthermore, according to the LM3886 or very cheap, in fact, this chip can get the price of a single LM3886 and LM3886 are the two pieces.

National'dan Now some of you may wonder how much money you have received, just trying to honorary Let me answer. What amplifiers do not come across so many years of better integration of audio adventure. Whether you prefer the other direction can not not ask.

Let us come şemamıza circuit;

Yes my friends, is a simplest amplifier is here again in the world. Only this time that the five other pieces of entegremiz humble 27-pin Vcc and Vee connection is available. Indeed ... The sound quality is hard to design a PCB that is integrated with almost the same technical features as follows LM3886'yla;

Maximum Output Power: 2 x 60W, 108W Peak (per channel)
THD + Noise: 0.03%
SNR: 114dB
PSRR: 120dB

Still pretty good. Less noise, less distortion and maximum output ... I do not need to review the circuit. National Semiconductors engineers proposed circuit. Only in this circuit as a number of different one each from the project available Zobel network (Rz and Cz), which protects tweeterlerimizi unwanted frequencies. But naturally affects the treble performance. RZ1 RZ2 friends who do not want and can disable cz1 CZ2 elements.

In amplifier so that's enough.


However, an unregulated power supply circuit is simple and designed. More accurately, we used the old.

Naturally, the same printed circuit board, the operating principle. A simple diode bridge and filter capacitors. I do not need to explain.

On behalf of friends who wish to obtain a better result than they might try to feed two-regulating coolers LM338 and robust.

DC1 and DC2 çıkışlarımıza tied a piece of this circuit (+ Vin - GND) R2 trimpotuyla synchronize both the supply channel. The bottom of the circuit (+) end of the Word Association (GND) connected to the sine that's all. Note however, that output will fall at least 1.2V hood. And a regulation of real output for the introduction of a difference between the hood must be at least 5-8v.
It does not matter, but a print devremiz s already LM338 LM4780 can connect a heat sink that is the same as the elements need to attach mounting space. In addition, the condensers C1 and C2 do not need. Do not forget to wear eye bead cooler and bolts connecting the outputs of the short circuit isolator is ...


Finally, the implementation phase of this project we are. In fact, do not have a very difficult application. PCBs have the entire stock condition except for the regulator circuits. We remain only soldering.

PCBs have a very simple application of the pre-yükselteçte P1 - P6 ends of potentiometer connected to the stereo. 4-pin to a push button in the middle of something big. Domestic goods Tunik'in four terminal switch (tunic LK104 model) can use it in peace of mind (I did it). This button activates or takes Linkwitz circuit. Uyarımızı let's important here: This is not a button to open and close the circuit with power. If the speakers are connected to the instantaneous voltage on the speaker that can burn a play button. Always press the power cut. Assembling the list of material compared to their counterparts do. J1 and J2 jumperlerdir simple wire. The upper terminals or the local equivalent of the Phoenix klemenslerdir PCB type. Here is a very important issue I need reminding: This is the circuit supply inputs from left to right + (GND) (GND) - dir. In fact, we use two fully symmetrical power supply for the two sheets of plain polarized devremiz available. In other words, the first of the second plus plus plus, but as connected to GND. This is the link if you have to do the same to feed the power amplifier with short circuit and diyotlarınızla trafonuz is also mevta.

PCBs also have this power amplifikatörümüzün. However, a simplified design. Here, we have to be very careful jumper wire. Near and parallel to the chip with the jumper wire to four holes in the circuit is open already in print. However, the signal ends integrated into the chassis number 12 and 19 point to the two holes were not opened for a long jumper. As for the cause, they are jumping from the bottom and insulated cable to be held. Chassis must be kept short to prevent the cycle from the top, and if they could not get it I did. I know I do not look very professional on the card or the like, but you can see a lot of mass production. In the meantime, we will mute and the mute the output of one standard header with a jumper that will connect the two ends together. Those who want to use it as a relay or switch mute on. In addition, integrated circuit LM4780TA Vee will have access to the metal body (-) end of the supply. Therefore, silicon-based chip or a izolatörle mica and silicon gresiyle necessarily have to mount the cooler. PCBs also can attract our attention to another subject, the size of capacitors CIN-coded. These are in fact 4.7 and electrolytic type kondansatörlerdir health when used in inductance can be much smaller in size. However, for capacitors used in audio-frequency technique, the signal line has a rule that does not change, it must also be alloyed metal, polyester type, and should, if possible. We have our application, ie, metallized polyester unbiased MKS 4.7 63v inductance and the size of the capacitor used exactly like this. MKP and MKT-type capacitors are larger than those who want to use. Even the fanatics;

style "ultra-low noise," may use capacitors. Very expensive and money compared to my current 1.5 YTL of whom a MKS oranınca do not sound good. This type of MOSFET capacitors with more or lamp type HIEND is necessary to use amplifiers. Namely, each of which occupies much space as we do about an amplifier card are expensive amplifier card. ($ 15-20)

So then let's power supply PCB capacitors tıraşından cine;

Now some of the supply circuit, a father-informed citizens (that used in his country, "Snubber" it said) for the above capacitors will geyiğini HIEND. Maybe it is right that friends own diameters. Nichicon Gold series capacitors is almost a special coin is a good speaker. Give good results, but eventually all kururlar such as electrolytic capacitor. Exact solutions are created on top of tantalum kondansatörlerdir but unfortunately 100μF. You still Rubycon, Philips or something to get the Sanyo brand. But it is not worth a lot more money to spend. Moreover, you can not explain this situation to those who are using KBU bridge together:). In the meantime, the father of two health 10.000 inductance capacitor would like to remind you to be quite costly.

As a result, some very nice photos you;

Meret such a thing is summed up in this. Great for not using the relay I put the key, but I added parallel capacitor and the reverse diode. Do you like it. Bit LED called (at least I get from my place so she says) I used the LED as an indicator of 1.5mm. And as you can see the front panel is very simple. Only one pot and switch it up. Output / input consists of the standard RCA and speaker terminals. Four-terminal connection to the power box at the bottom of the rear panel. Transformer and the feed, I had put in a separate box. I think so, do you. Thus, instead of big box are two tiny box and listen to audio out so I do not know how to ride so much. In addition, this condition is to prevent the transformer noise.

Now you say where this amp, next to my computer. Speaker boxes are going to muddle along 50Wlık I do myself, such as roses. Solo openly admit that he never fully dinleyemedim sound. Known neighbors, people at home, etc ... You listen to me, if possible, please ediverin report. In fact, I do not think there'd be a chance like that 90% ies. Listen to the sound especially when you see what's going on in a half!

We do not claim to have proof. Here is proof in and make yourself.

Easy come.

Material List
Preamplififkatör Material List
R1 = R2 1K 0.6 W 1% Metal Film Resistor
R8 = R14 47k 0.6 W 1% Metal Film Resistor
R4 = R10 10K 0.6 W 1% Metal Film Resistor
R3 = R9 33K 0.6 W 1% Metal Film Resistor
R5 = R7 = R12 = R11 22K 0.6 W 1% Metal Film Resistor
R6 = R13 27K 0.6 W 1% Metal Film Resistor

C4 = C7 680nF Metal Film Polyester 10%
C5 = C1 47μF 35V Electrolytic
C11 = C13 100nF 35V Ceramic Disc
C9 = C10 = C12 = C14 10μF 35V Tantalum

IC1 LM833, NE5532, TL072
IC2 7815
IC3 7915

Other Materials
Tunic 4x3 Push Switch
3 Piece 2li
1 Unit 3-party terminal

Amplifier Material List
RI2 = RI1 = RF1 = RFI2 1K 0.6 W 1% Metal Film Resistor
RF2 = RFI1 20K 0.6 W 1% Metal Film Resistor
RL1 = RL2 47k 1/4W 5% Carbon Resistor
RM 10K 1/4W 5% Carbon Resistor
RG 2.2 ohms 1/4W 5% Carbon Resistor
RZ1 = RZ2 2.7 ohms 1W Carbon Resistor

CSN1 = CSN2 2.200 inductance 35V Electrolytic
CS1 = CS2 10μF 35V Tantalum
CN1 = CN2 100nF 35V Ceramic Disc
CIN1 = CIN2 Inductance 4.7 MKS 63v MVP or polyester type unbiased
CF1 = CF2 100μF 35V Electrolytic
Cz1 = CZ2 100nF 63v Polyester
CG 470nF 63v Polyester

IC1 LM4780TA

Other Materials
2 with 3 units
2 x 3-party terminal
Double Header

Power Supply Materials
2 Units KBU6XX Bridge
2 Units 10.000 inductance 35V Electrolytic
Terminal 4 Piece 2li.

LM4780 2x60W Power Amplifier

LM4780 2x60W Power Amplifier

LM4780 2x60W Power Amplifier

LM4780 2x60W Power Amplifier

LM4780 2x60W Power Amplifier

LM4780 2x60W Power Amplifier

LM4780 2x60W Power Amplifier

LM4780 2x60W Power Amplifier

LM4780 2x60W Power Amplifier

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