Showing posts with label amplifier. Show all posts
Showing posts with label amplifier. Show all posts

Monday, January 26, 2015

Boomer Audio Power Amplifier Using LM4906

The well-known LM386 is an excellent choice for many designs requiring a small audio power amplifier (1-watt) in a single chip. However, the LM386 requires quite a few external parts including some electrolytic capacitors, which unfortunately add volume and cost to the circuit.

National Semiconductor recently introduced its Boomer® audio integrated circuits which were designed specifically to provide high quality audio while requiring a minimum amount of external components (in surface mount packaging only). The LM4906 is capable of delivering 1 watt of continuous average power to an 8-ohm load with less than 1% distortion (THD+N) from a +5 V power supply. The chip happily works with an external PSRR (Power Supply Rejection Ratio) bypass capacitor of just 1 µF minimum.

In addition, no output coupling capacitors or bootstrap capacitors are required which makes the LM4906 ideally suited for cellphone and other low voltage portable applications. The LM4906 features a low-power consumption shutdown mode (the part is enabled by pulling the SD pin high).

Additionally, an internal thermal shutdown protection mechanism is provided. The LM4906 also has an internal selectable gain of either 6 dB or 12 dB. A bridge amplifier design has a few distinct advantages over the single-ended configuration, as it provides differential drive to the load, thus doubling output swing for a specified supply voltage. Four times the output power is possible as compared to a single-ended amplifier under the same conditions (particularly when considering the low supply voltage of 5 to 6 volts).

Boomer Audio Power Amplifier Circuit Diagram:


When pushed for output power, the small SMD case has to be assisted in keeping a cool head. By adding copper foil, the thermal resistance of the application can be reduced from the free air value, resulting in higher PDMAX values without thermal shutdown protection circuitry being activated. Additional copper foil can be added to any of the leads connected to the LM4906. It is especially effective when connected to VDD, GND, and the output pins. A bridge configuration, such as the one used in LM4906, also creates a second advantage over single-ended amplifiers. Since the differential outputs, Vo1 and Vo2, are biased at half-supply, no net DC voltage exists across the load.

This eliminates the need for an output coupling capacitor which is required in a single supply, single-ended amplifier configuration. Large input capacitors are both expensive and space hungry for portable designs. Clearly, a certain sized capacitor is needed to couple in low frequencies without severe attenuation. But in many cases the speakers used in portable systems, whether internal or external, have little ability to reproduce signals below 100 Hz to 150 Hz. Thus, using a large input capacitor may not increase actual system performance. Also, by minimizing the capacitor size based on necessary low frequency response, turn-on pops can be minimized.
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Wednesday, November 19, 2014

Tube amplifier with power 25 Watt

Tube Power Amplifier 35W Push Pull is made using a tube and eventually compiled configuration push-pull amplifier. Tube Power Amplifier 35W Push Pull tube til it using EL-34 as the amplifier end.
In the power amplifier that is made with a tube at a glance looks simple because the use of active components that are not complex. It should be noted that the use of tubes in Tube Power Amplifier 35W Push Pull require a high voltage supply, therefore in the process of making and finishing must be careful of high voltage and radiation. Detailed series of Tube Power Amplifier 35W Push Pull can be seen in the following figure.

Tube Power Amplifier Series 35W Push Pull

Sign Components Tube Power Amplifier 35W Push Pull
R1 = 470K 0.5 W
R2-5 = 2K2 0.5W
R3 = 150K 0.5W
R4 = 220K 0.5W
R6-10 = 56K 0.5W
R7 = 3.9K 0.5W
R8 = 220R 0.5W
R9 = 1M 0.5W
R11 = 39K 1W
R12-23 = 180K 0.5W
R13-21 = 820K 0.5W
R14-22 = 5K6 0.5W
R15-20 = 680K 0.5W
R16-19 = 100K 0.5W
R17-18 = 3K3 1W
R24 = 470R 2W
TR1-2 = 470R 1W Variable (adj. 270Ω)
C1-3-6-7 = 0.1uf 630V
C2 = 220pF 600v
C4-5 = 16uF 550V
C8-9 = 0.1uF 630V
C10-14 = 0.47uF 630V
C11-13 = 25uF 40V
V1 = E80CC
V2 = E80CC
V3-4 = EL34
Rectifier tube = Z2C
Audio Transformer for T1 = 2x EL34 Push Pull
Power amplifier with tubes often become the choice for a small slewrate so that the resulting audio quality is guaranteed. Tube Power Amplifier 35W in the circuit that is required to supply a high DC voltage is +220 VDC ddengan order to work properly.
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Tuesday, November 18, 2014

Low Cost Digital Volume Control Amplifier

TDA8551 Mini Digital Volume Control Amplifier
Amplifier with digital volume control can we create a predictably simple because the article Mini BTL Amplifier with Digital Volume Control This series is made ​​only with 1 IC TDA8551. The series of Mini BTL Amplifier with Digital Volume Control is a power amplifier with BTL type 1Watt. Techniques for adjusting the volume in this series has been provided with a pin point control that is controlled by providing an input voltage VCC and GND. The series of Mini BTL Amplifier with Digital Volume Control selector also features mute, standby and operating.

The series of Mini BTL Amplifier with Digital Volume Control is quite simple and small enough to make an amplifier for room or to headphones. Hopefully useful and can provide ideas for making digital amplifier with volume control.
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Monday, November 17, 2014

LM317 Simple Audio Amplifier

You most likely know that LM317 IC is applied as an practical provide regulator, but did you know it can be applied as an audio amplifier? This is a Low power Amplifier LM317 Simple Audio Amplifier Circuit a audio  designed with LM317 that offers a optimum probable 1W audio strength. 
LM317 Simple Audio Amplifier Circuit Diagrams :
LM317 Simple Audio Amplifier Circuits

Utilization a amazing heatsink for the LM317 IC and modify the 5K various resistor so that you have 4.5V on 10Ω resistor (or LM317 pin 2, Vout).
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Friday, November 7, 2014

Playback Amplifier For Cassette Deck

For some time now, there have been a number of tape cassette decks available at low prices from mail order businesses and electronics retailers. Such decks do not contain any electronics, of course. It is not easy to build a recording amplifier and the fairly complex magnetic biasing circuits, but a playback amplifier is not too difficult as the present one shows. The stereo circuits in the diagram, in conjunction with a suitable deck, form a good-quality cassette player. The distortion and frequency range (up to 23 kHz) are up to good standards. Moreover, the circuit can be built on a small board for incorporation with the deck in a suitable enclosure. Both terminals of coupling capacitor C1 are at ground potential when the amplifier is switched on.

Circuit diagram:


Because of the symmetrical ±12 V supply lines, the capacitor will not be charged. If a single supply is used, the initial surge when the capacitor is being charged causes a loud click in the loudspeaker and, worse, magnetizes the tape. The playback head provides an audio signal at a level of 200–500 mV. The two amplifiers raise this to line level, not linearly, but in accordance with the RIAA equalization characteristic for tape recorders. Broadly speaking, this characteristic divides the frequency range into three bands:

  • Up to 50 Hz, corresponding to a time constant of 3.18 ms, the signal is highly and linearly amplified.
  • Between 50 Hz and 1.326 kHz, corresponding to a time constant of 120 µs, for normal tape, or 2.274 kHz, corresponding to a time constant of 70 µs, for chromium dioxide tape, the signal is amplified at a steadily decreasing rate.
  • Above 1.326 kHz or 2.274 kHz, as the case may be, the signal is slightly and linearly amplified. This characteristic is determined entirely by A1 (A1’). To make the amplifier suitable for use with chromium dioxide tape, add a double-pole switch (for stereo) to connect a 2.2 kΩ resistor in parallel with R3 (R3’). The output of A1 (A1’) is applied to a passive high-pass rumble filter, C3-R5 (C3’-R5’) with a very low cut-off frequency of 7 Hz. The components of this filter have exactly the same value as the input filter, C1-R1 (C1’-R1’). The second stage, A2 (A2’) amplifies the signal ´100, that is, to line level (1V r.m.s.).
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Tuesday, November 4, 2014

10W Audio Amplifier With Bass Boost

High Quality, very simple design, No preamplifier required. This design is based on the 18 Watt Audio Amplifier, and was developed mainly to satisfy the requests of correspondents unable to locate the TLE2141C chip. It uses the widespread NE5532 Dual IC but, obviously, its power output will be comprised in the 9.5 - 11.5W range, as the supply rails cannot exceed ±18V.

 As amplifiers of this kind are frequently used to drive small loudspeaker cabinets, the bass frequency range is rather sacrificed. Therefore a bass-boost control was inserted in the feedback loop of the amplifier, in order to overcome this problem without quality losses. The bass lift curve can reach a maximum of +16.4dB @ 50Hz. In any case, even when the bass control is rotated fully counterclockwise, the amplifier frequency response shows a gentle raising curve: +0.8dB @ 400Hz, +4.7dB @ 100Hz and +6dB @ 50Hz (referred to 1KHz).

 10W Bass Boost Amplifier Circuit Diagram:

Parts:

P1_________________22K Log.Potentiometer (Dual-gang for stereo)
P2_________________100K Log.Potentiometer (Dual-gang for stereo)
R1_________________820R 1/4W Resistor
R2,R4,R8___________4K7 1/4W Resistors
R3_________________500R 1/2W Trimmer Cermet
R5_________________82K 1/4W Resistor
R6,R7______________47K 1/4W Resistors
R9_________________10R 1/2W Resistor
R10________________R22 4W Resistor (wirewound)
C1,C8______________470nF 63V Polyester Capacitor
C2,C5______________100µF 25V Electrolytic Capacitors
C3,C4______________470µF 25V Electrolytic Capacitors
C6_________________47pF 63V Ceramic or Polystyrene Capacitor
C7_________________10nF 63V Polyester Capacitor
C9_________________100nF 63V Polyester Capacitor
D1_________________1N4148 75V 150mA Diode
IC1_________________NE5532 Low noise Dual Op-amp
Q1_________________BC547B 45V 100mA NPN Transistor
Q2_________________BC557B 45V 100mA PNP Transistor
Q3_________________TIP42A 60V 6A PNP Transistor
Q4_________________TIP41A 60V 6A NPN Transistor
J1__________________RCA audio input socket

Power Supply Circuit diagram:


PSU_For_10W_Audio_Amplifier 
Power supply parts:

R11______________1K5 1/4W Resistor
C10,C11__________4700µF 25V Electrolytic Capacitors
D2_______________100V 4A Diode bridge
D3_______________5mm. Red LED
T1_______________220V Primary, 12 + 12V Secondary 24-30VA Mains transformer
PL1______________Male Mains plug
SW1______________SPST Mains switch

Notes:
  • Can be directly connected to CD players, tuners and tape recorders.
  • Schematic shows left channel only, but C3, C4, IC1 and the power supply are common to both channels.
  • Numbers in parentheses show IC1 right channel pin connections.
  • A log type for P2 will ensure a more linear regulation of bass-boost.
  • Do not exceed 18 + 18V supply.
  • Q3 and Q4 must be mounted on heatsink.
  • D1 must be in thermal contact with Q1.
  • Quiescent current (best measured with an Avo-meter in series with Q3 Emitter) is not critical.
  • Set the volume control to the minimum and R3 to its minimum resistance.
  • Power-on the circuit and adjust R3 to read a current drawing of about 20 to 25mA.
  • Wait about 15 minutes, watch if the current is varying and readjust if necessary.
  • A correct grounding is very important to eliminate hum and ground loops. Connect to the same point the ground sides of J1, P1, C2, C3 &C4. Connect C9 to the output ground.
  • Then connect separately the input and output grounds to the power supply ground.
Technical data:

Output power:
10 Watt RMS into 8 Ohm (1KHz sinewave)
Sensitivity:
115 to 180mV input for 10W output (depending on P2 control position)
Frequency response:
See Comments above
Total harmonic distortion @ 1KHz:
0.1W 0.009% 1W 0.004% 10W 0.005%
Total harmonic distortion @ 100Hz:
0.1W 0.009% 1W 0.007% 10W 0.012%
Total harmonic distortion @ 10KHz:
0.1W 0.056% 1W 0.01% 10W 0.018%
Total harmonic distortion @ 100Hz and full boost:
1W 0.015% 10W 0.03%
Max. bass-boost referred to 1KHz:
400Hz = +5dB; 200Hz = +7.3dB; 100Hz = +12dB; 50Hz = +16.4dB; 30Hz = +13.3dB
Unconditionally stable on capacitive loads
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Monday, November 3, 2014

100W Audio Amplifier Transistor used BDW83D BDW84D circuit diagram

Here 100 watt power audio amplifier which using power transistor BDW83D and BDW84D. Copyright belong to Smart Kit. Schematic diagram:

Component part list:

R1 = 1,2 K                                   D1 = 1N4002-7  
R2 = 0,47 OHM                           D2 = 1N2002-7  
R3 = 220 OHM                            D3 =  1N4148     
R4 = 3,9 K                                   D4 = 1N4148      
R5 = 2,2 K                                   D5 = 1N4148      
R6 = 2,2 K                                    D7 = 1N4148     
R7 = 10 K                                    D8 = 1N4148      
R8  = 4,7 K                                  Q1 = BDW84D   
R9 = 150 OHM                            Q2 = BD829       
R10 = 39 OHM                            Q3 = BC546       
R11 = 3,3 K                                  Q4 = BC556      

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Sunday, November 2, 2014

14W CLASS A AMPLIFIER USING 2N3055 ELECTRONIC DIAGRAM

14W CLASS A AMPLIFIER USING 2N3055 ELECTRONIC DIAGRAM

Why Class A ? Because , when biased to class A, the transistors are always turned on, always ready to respond instantaneously to an input signal. Class B and Class AB output stages require a microsecond or more to turn on. The Class A operation permits cleaner operation under the high-current slewing conditions that occur when transient audio signal are fed difficult loads. His amplifier is basically simple, as can be seen from the block diagram.
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Friday, October 31, 2014

OCL Power Amplifier Circuit MJ15003 MJ15004

This Power Amp OCL 100 watt circuit by transistors.They has been an old circuits, but very well amplifier schematic. We use only all transistor MJ15003 and MJ15004 is the main in circuits, and the power supply +38V 0 -38V 3A. follow stye of OCL amp and They has Specification are
power output : 105watt at 4 ohm load, 88watt at 8 ohms load
input sensitivity : 0.5V
Frequency response : 10-10kHZ +/- 1dB
THD: 0.07% at 50 watt , 0.1% at 100 watt.

This power amp OCL 100w is a very excellent sound quality. Since we provide the circuit in look All direct coupling form is connection join together direct all, to cut-off frequency low-loss problems, the super bass really do not tell who.
The signal Input of the tone controls enter via C1 to the base pin of transistor Q1, which together with the Q2 is differential amplifier, the signal from the collection pin of Q1 supplied to the bas pin of the Q5, which it acts as the pre-driver circuit.
- The transistor Q4 is setting level bias or act as to control Idle current in this circuit. Which we can adjust level idle current by By adjusting the VR1.
- The transistor Q3 acts as a boost trapping.
- The output signal from the Q5 will enter to base pin of Q8,Q9.which acts as the driver circuit. For the signal output to drive the output transistors Q10, Q11.
- Both output transistors Q10, Q11, we used the number on the circuit are MJ15003, MJ15004. This couple can use up to 200W, so not problem in durability.
If you want to save. May be represented by a pair of output are 2N3055, MJ2955 each of the two parallel each other instead.

OCL
100W OCL Power Amplifier Circuit MJ15003,MJ15004

Creation
-Check the assembly of all equipment to correct the circuit, without the output transistors, Using a voltmeter measure the voltage at the speaker. By also does not have a speaker. At the end of this process was completed and ready to operate immediately.
-Put the power supply to the circuit, then to measure the voltage is 0V or not higher than 0.25V, if not in this means that the circuit failure, need to check first.
-The later, on output transistors, and then use an ammeter to measure the current is supplied with short input circuit. Measuring that positive or negative wire. Then, adjust VR1 until reading about the current 20-40 mA.
- For transistor Q4, when the device successfully. Should be installed on the cooling pad. Which installation of the output transistor. To help control the the bias current output relative to the temperature change of the output transistor.
- The power supply circuit is got by power of transformer T1, which provides voltage to the coil in the secondary coil is 27-0-27 volt, 5 amp.
- The Diodes Bridge rectifier should be not lower than 5 Amp 100V, The filter capacitor C7, C8 we used a 1,000uF 50V, the voltage at the capacitor afer through the filter will can about 38V.
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Thursday, October 30, 2014

Circuit 150W amplifier with active crossover

stereo
Series 150W Amplifier With Active Crossover Series 150W Amplifier with Active Crossover is very interesting. Actually, this circuit uses 4-channel power amplifier chip. Well, as an Active Crossover here we use also a chip that can separate the tone of the bass, midrange and treble, the output from the Active Crossover can be directly amplified by power amplifier.

Power Chip 4-channel amplifier that we use is SANYO LA47536 who have power outputs up to 150W, while for Active Crossover (Active Crossover) we use the LF353 from National Semiconductor.

stereo
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Wednesday, October 29, 2014

LM1875 20W audio amplifier Diagram Circuit

Description.
This is just another 20W audio amplifier circuit , but this time based on the LM1875 audio amplifier IC from National Semiconductors. With a 25V dual power supply LM1875 can deliver 20W of audio power into a 4 ohm speaker. The LM1875 requires very less external components and has very low distortion. The IC is also packed with a lot good features like fast slew rate, wide supply voltage range, high output current, high output voltage swing, thermal protection etc. The IC is available in TO-220 plastic power package and is well suitable for a variety of applications like audio systems, servo amplifiers, home theatre systems etc.
Circuit diagram.

Notes.
lm1875 20w audio amplifier circuit and explanation
  • Assemble the circuit on a good quality PCB.
  • Use +/-25V DC dual supply for powering the circuit.
  • K1 can be 4 ohm, 20W speaker.
  • A proper heat sink is necessary for the IC.
  • F1 and F2 are 2A fuses.
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USB Powered Audio Power Amplifier Circuit Diagram

This is the simple USB Powered Audio Power Amplifier Circuit Diagram. This circuit of multimedia speakers for PCs has single-chip-based design, low-voltage power supply, compatibility with USB power, easy heat-sinking, low cost, high flexibility and wide temperature tolerance. At the heart of the circuit is IC TDA2822M. This IC is, in fact, mono-lithic type in 8-lead mini DIP package. It is intended for use as a dual audio power amplifier in battery-powered sound players. Specifications of TDA2822M are low quiescent current, low crossover distortion, supply voltage down to 1.8 volts and minimum output power of around 450 mW/channel with 4-ohm loudspeaker at 5V DC supply input. 

An ideal power amplifier can be simply defined as a circuit that can deliver audio power into external loads without generating significant signal distortion and without consuming excessive quiescent current. This circuit is powered by 5V DC supply available from the USB port of the PC. When power switch S1 is flipped to ‘on’ position, 5V power supply is extended to the circuit and power-indicator red LED1 lights up instantly. Resistor R1 is a current surge limiter and capacitors C1 and C4 act as buffers. Working of the circuit is simple. Audio signals from the PC audio socket/headphone socket are fed to the amplifier circuit through components R2 and C2 (left channel), and R3 and C3 (right channel).

Circuit diagram:



USB Powered Audio Power Amplifier Circuit Diagram

Potmeter VR1 works as the volume controller for left (L) channel and potmeter VR2 works for right (R) channel. Pin 7 of TDA2822M receives the left-channel sound signals and pin 6 receives the right-channel signals through VR1 and VR2, respectively. Ampl i f ied signals for driving the left and right loudspeakers are available at pins 1 and 3 of IC1, respectively. Components R5 and C8, and R6 and C10 form the traditional zobel network. Assemble the circuit on a medium-size, general-purpose PCB and enclose in a suitable cabinet. It is advisable to use a socket for IC TDA2822M. The external connections should be made using suitably screened wires for better result.



Sourced By: EFY
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Tuesday, October 28, 2014

400Watt IRFP448 Power Amplifier

Power amp 400W IRFP448 Circuit
Amplifier circuit these days,We would like to musical you pro the MOSFET 400 watt amplifier is amplifier on my kW shares the same circuit and main PCB design. The barely real difference is the figure of output procedure to the device. We encompass using The IRFP448 design while the MOSFET amplifier 14 O / P procedure. These amplifiers can live used used for almost a few effort with the aim of requires in height performance, low apply din, distortion and brilliant sound quality. Examples would be subwoofer amplifier be supposed to FOH stage Amplifiers, surround a inland waterway a very powerful sound amplifier, et cetera. The 400W MOSFET-amplifier has four tone stages of amplification. We are looking to start several   stage appropriate list.

400Watt IRFP448 Power Amplifier Circuit Diagram


The bias and bumper stage
in the role of the entitle suggests All Q ,C and ZD the Bias and buffer phases. Its major goal is to provide a firm MOSFET Gates  and offset voltage and the voltage memory amplifier stage of the extraordinary Resource scope. pardon? would engage in devoid of the period response and the effect Slew rate is indeed very bad. The flip part of the coin is not the spare step Introduction of an bonus dominant pole trendy the amplifier opinion disk.

Power amp 400W IRFP448 PCB and  the electronic components layout thus as below :

PCB layout design

Component Placement
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Monday, October 27, 2014

300W Power Amplifier Circuit with 2N773

Power Amplifier 300W with transistor 2N3773
This amplifier was designed to provide a use for the otherwise useless TO3 power transistors that many hobbyists have in their junk pile.  With good construction the module is capable of high quality performance and is rated to 300 watts into a 4 ohm load depending on power supply.  With the driver and output transistors specified it is limited to DC rails of +/- 70 volts. 

Power Amplifier Circuit Diagram

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Friday, October 24, 2014

1500W HiFi Power Amplifier Circuit

Circuit Power Amplifier has a power output of up to 1500W RMS, power amplifier circuit is often used to power sound systems needed to outdor. In a series of images can be seen the final power amplifier uses 10 sets of large power transistors for the ending.
This power amplifier circuit using a transistor amplifier starting from the front, signal splitter, driver and power amplifier. Current consumption required is quite large power amplifier that is 15-20 A for this 1500W power amplifier circuit. Supply voltage needed by the power amplifier in order to work optimally is symmetrical 130VDC (130VDC ground-+130 VDC). 1500W amplifier circuit below is a picture series of mono, if you want to create a stereo it is necessary to make 2 copies of the circuit. For more details can be viewed directly image following a series 1500W power amplifier.

1500W HiFi Power Amplifier with Transistors



In the above series 1500W power amplifer has been equipped to control the DC Offset function to set the power amplifier when turned on and no input signal then the output should 0VDC. Then it is also equipped with a bias flow regulator to the power amplifier. The final power amplifier section requires that sufficient coolant to absorb heat generated. Power amplifier is not equipped with speakers protectors, therefore it should diapsang speaker protector on the output for when the power amplifier is turned on does not happen the beat to the speakers that may damage the speaker.
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Wednesday, October 22, 2014

200 Watt Power Amplifier STK4050 STK4046

Amplifier circuit with IC STK is tough and good quality. In this article an amplifier circuit with IC STK another base. Power "Amplifier 200Watt By STK4050" is an audio amplifier of the STK family with 200Watt power. To create a power amplifier with the STK4050 IC is not require many external components.

Power Amplifier uses symmetric 30Volt power supply system. Power Amplifier With this STK4050 can reproduce the power 200 Watts at 8 Ohm load spaker. In making Power Amplifier 200Watt With this STK4050 do not forget to provide adequate heat sink for the IC STK 4050 in order to avoid overheating.


Schematics Amplifier STK4050-STK4046


PCB Layout Amplifier

Series Power Supply for Power Amplifier 200Watt By STK4050 been displayed in one image with a series of "Power Amplifier" 200Watt With STK4050 above. IC STK 4050 in this series there are several types on the market including STK4050II, STK4050V and STK4050.

And below is a list of STK ICs are used for a good quality amplifier.

Datasheet STK IC Amplifier
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Wednesday, October 15, 2014

2N3055 with PCB Power Amplifier OCL 60W

2N3055
This is Power Amplifier OCL 60W circuit. It is the circuit that gives bland excellent sound , because of use the transistor entirely (Hot part 2N3055 x 2) have no IC mix. Then may build difficult go to small but for what is the experienced person may have no a problem. For sound power that pay to come out about 60W at 8ohm size loudspeakers s build to sing can bail 12 inch sizes comfortablely. About story of the voltage supply for this circuit as a result the important. Should use the pressure about +/- 40V the trend doesn’t lower 3A .Other detail see in circuit picture.
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Sunday, October 5, 2014

2 1 Channel Systems Dual Power Amplifier TDA7240 and TDA1517

The main problem with the design of stereo amplifier with a total bass driver, is that the signals of left and right channels, sooner or later, are summarized. As a result of merely adding up, the separation between channels is reduced to a minimum and violated the very idea stereofonii.

The most efficient method of summation, known today - signal active smesitelyami - filters with high input impedance, which is often used by field-effect transistors. Subsequent cascades enhance increase the amplitude of the signal. I tried to make some other way - most to weaken the signals of channels and to make their addition, as late as possible, before entering signal with high sensitivity (TDA 7240 - 46dB). The second chip-TDA 1517, serves as a mid-frequency driver. I must say that the problem is not solved completely, the separation between channels is desirable to do more, subjective listening showed a contraction of panoramas, lack of air, which is inherent in amplifiers with independent channels.

Listen to music using the device somewhat tiresome, but it very effectively transmits audio material of films and computer games. In any case, the amplifier has shown significant superiority over the multimedia system Logitech Z - 340, which is one of my friends recently bought for $ 60. Another nice time - managed to realize the possibility of simultaneous volume in all channels, which will agree, very convenient. Thus, the scheme was recommended for the recurrence of 2.1 Channel Systems, with the prospect of it improving.

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Thursday, October 2, 2014

Current Corrected AF Amplifier Circuit

  1. The connection of the opamp’s output to ground is slightly unusual, but enables the base current for output transistors T1 —Tz to be drawn from the supply rails, rather than from the opamp.
  2. The current ‘· through the voice coil and R12 v develops a voltage across the 1 resistor. A negative feedback · loop is created by feeding this reference voltage to the inverting input of IC.
  3. The quiescent current of the amplifier is of the order of 50 to 100mA for class A operation, and is determined by Ra-R4 and R5-Rs.
  4. The complementary power transistors should be closely matched types to avoid fairly large offset currents (and voltages) arising.
  5. Capacitor Cs functions to set the roll-off frequency at about 90 kHz.
  6. Some re-dimensioning of either Ra or R4 may be required to achieve the correct balance for the power output stage.
  7. This amplifier is based on current feedback to ensure that the current sent through the voice coil remains in accordance with the input signal.
  8. In the present case the amplification is 16 times (Z1./R1=8/0.5=16).
  9. The emitter current of T1 and T2 is about 500 mA when the amplifier is fully driven. The harmonic distortion of this ampflier is less than 0.01% at P=6.25 W and U= $18
  10. The overall amplification of the circuit depends on the ratio of the ·loudspeaker’s impedance, Z1., to the value of Rv.
  11. In multi-way speaker systems, this difficulty is overcome by appropriate dimensioning of " the crossover filter, but a different approach is called for when there is but one loudspeaker.
  12. It l is very much evident, therefore, that the power delivered by such amplifiers is inversely. proportional to the loudspeaker impedance, since the cone displacement of a loudspeaker is mainly a function of the current through the voice coil, whose impedance may vary considerably over the relevant frequency range.
  13. The majority of modern AP power amplifiers drive the speaker(s) with a voltage that is simply a fixed factor greater than the input voltage. 
Source: Téxas Instruments Linear Applications.  

Current Corrected AF Amplifier Circuit is shown below:
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Wednesday, October 1, 2014

Simplest 12 Watt Stereo Amplifier Circuit

  The Type TDAl52l from Valvo/Mullard is an integrated HiFi stereo power amplifier designed for mains fed applications such as stereo TV The device works optimally when fed from a j 16V supply; and delivers a maximum output power of 2x12 W into 8 Q.
The gain of the amplifiers is fixed internally at 30 dB with a spread of 0.2 dB to ensure optimum gain balance between the channels. A special feature of the chip is its built-in mute circuit, which disconnects the non-inverting inputs when the supply voltage g is less than j 6Vj a level at which the amplifiers are still correctly biased. This arrangement ensures the absence of unwanted clicks and other noise when the amplifier is switched on or off. The TDAl52l is protected against output short circuits and thermal overloading. The SIL9 package should be bolted onto a heat- sink with a thermal resistance of no more than 3.3 K/W (R1.=8 Q; Vs: ;r 16 V; Pa=l4.6 W; Ta: 65 °C). Note that the metal tab on the chip package is internally connected to pin 5. The accompanying photograph shows that this high quality stereo amplifier has a very low component count, and is readily constructed on a piece of Veroboard. The following technical data are stated as typical in the data- sheets for the TDAl52l   

Distortion at Pa: 12 W:
0.5%
Quiescent current:
40 mA
Gain balance:
0.2 dB
Supply ripple rejection:
60 dB
Channel separation:
70 dB
Output offset voltage:
20 mV
3 dB power bandwidth:
20-20,000 Hz
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