سلام.در این قسمت مدارهای پری آمپلیفایر و آمپلیفایرهای مختلف قرار میدهیم.
سلام.در این قسمت مدارهای پری آمپلیفایر و آمپلیفایرهای مختلف قرار میدهیم.
ویرایش توسط javad naderi : 14-04-2011 در ساعت 13:09
10W Mini Audio Amplifier
Componets ListR1 : 6 Ohm
R2 : 220 Ohm
R3 : nothing
R4 : 10 KOhm pontesiometer
C1 : 2200 uF / 25V
C2 : 470 uF / 16V
C3 : 470 nF / 63V
C4 : 100 nF
C5 : nothing
C6 : nothing
IC1 : TDA 2003
2N3055 Power Amplifier
Simple and low cost. The optimal supply voltage is around 50V, but this amp work from 30 to 60V. The maximal input voltage is around 0.8 - 1V. As you can see, in this design the components have a big tolerance, so you can build it almost of the components, which you find at home. The and transistors can be any NPN type power transistor, but do not use Darlington types... The output power is around 60W.
Some comments:
- capacitor C1 regulates the low frequencies (bass), as the capacitance grows, the low frequncies are getting louder.
- capacitor C2 regulates the higher frequencies (treble), as the capacitance grows, the higher frequencies are getting quiter.
- this is a class B amplifier, this means, that a current must flow through the end transistors, even if there is no signal on the input. This current can be regulated with the 500Ω trimmer resistor. As this current incrases, the sound of the amplifier gets better, but the end transistors are more heating. But if this current decrases, the transistors are not heating so much, but the sound gets worse...
Amplifier schematic:
http://www.electronics-lab.com/proje..._Amplifier.zip
20W Audio Amplifier using LM1875
20W Audio Amplifier kit is based on LM1875 IC.
Power supply - 48 VDC
Output - 20 W, 4 Ω
Very low distortion (THD - 0.015%), good channel separation and ripple rejection
IC built-in thermal, short circuit protections
Internal output protection diodes
Terminal pins for connecting input
Power Battery Terminal (PBT) for easy power supply and speaker connection
Power-On LED indicator
Heatsink for IC
Four mounting holes of 3.2 mm each with nut and stud
PCB dimensions 48 mm x 60 mm
http://www.electronics-lab.com/proje..._amplifier.pdf
Stereo tape head preamplifier using LA3161
http://www.electronics-lab.com/proje...EAMPLIFIER.pdf
Universal Preamplifier
Description
Most audio amplifier systems must have preamplifiers with many different characteristics. These include high-gain linear response for magnetic microphones, low-gain linear response for tuners, and high-gain RIAA equalization for magnetic phone cartridges.
To meet this broad requirement, most amplifier designers include a single universal preamplifier circuit. Basically a high-gain linear amplifier, its characteristics can be altered by switching alternative resistor filter networks into its feedback system.
For example, when the selector switch is set to the Mag phono position, alternative input sources can be selected by S1-a, and appropriate linear-response gain control feedback resistors 220K, 470K, and 1M are now selected by S1-b. Those feedback resistor values are selected between 10 kilo ohms and 10 megohms to suit individual listener tastes. Circuit gain will be proportional, to the feedback resistor value.
http://www.electronics-lab.com/proje...EAMPLIFIER.PDF
Motorola Hi-Fi power amplifier
This is a very simple, low cost, Hi-Fi quality power amplifier. You can build it 5 ways, like its shown in the table (from 20 W to 80 W RMS).
Some comments:
- The first thing that you must do, is to measure the end transistors (T3 and T4) amplifying coefficient, the hfe or β. If their disagreement is bigger than 30 %, the amplifier would not give a clear sound. I used MJ3001 and MJ2501 transistors, and this disagreement was around 5%.
- Before the first turning on you must short circuit the inputs of the amp, and put a mA-meter on the output, than turn the amplifier on, and tune the R13 pot, to decrease the DC current on the output, to some uA-s, or in a lucky situation to zero. I was able to decrease it to 10 uA.
http://www.electronics-lab.com/proje...torola_amp.zip
20W Bridge Audio Amplifier
Specifications
20W Bridge Audio Amplifier kit, based on the TDA2005 IC, a class B dual audio amplifier, specifically designed for car radio applications etc.
Power supply - 18 VDC
Output power - 20 W, 4 Ω
IC built in Thermal Shut-down, Load dump voltage surge protected
Terminal pins for connecting left and right audio signal inputs
Relimate Connector for connecting Potentiometer (POT) for volume adjustment
Power Battery Terminal (PBT) for easy power supply and speaker connection
Power-On LED indicator
Heatsink for IC
Four mounting holes of 3.2 mm each with nut and stud
PCB dimensions 63 mm x 65 mm
Schematic
http://www.electronics-lab.com/proje..._amplifier.pdf
Portable Audio Amplifiers
Description
Stereo per channel
VCC=9V;RL=4?/3W
VCC=9V;RL=8?/2W
Bridge Application
VCC=9V;RL=8?/5W
VCC=9V;RL=4?/8W
Supply Voltage min = DC3v @ 500mA
Supply Voltage max = DC12v @ 500mA
Supply Voltage recommended = DC9v @500mA
DESCRIPTION
Above circuits are based on TEA2025 is a monolithic integrated audio amplifier in a 16-pin plastic dual in line package manufactured by UTC .Circuit has an Internal Thermal Protector. It is designed for portable cassette players and radios. You can also use it as your PC Audio Amplifier. A few external components required to build this circuit. Use 9v transformer to play the circuit. But not more than DC12v. Because it can damage the amplifier IC. So build n Enjoy.
http://www.electronics-lab.com/proje...AMPLIFIERS.PDF
Tiny audio amplifier using LM386
Specifications
The Tiny Audio Amplifier kit is a good choice for battery operation. It is based on LM386 IC.
Power supply - 6 - 12 VDC
Output power - 1 W, 8 Ohm
The quiescent power drain is only 24 mW when operating from 6 VDC
Self-centering output quiescent voltage
Onboard PRESET to adjust volume
Terminal pins for connecting power supply, audio signal and speaker
Power-On LED indicator
ON/OFF PCB mounted slide switch for power supply
Four mounting holes of 3.2 mm each
PCB dimensions 44 mm x 44 mm
Schematic
Inputs - Outputs configuration
http://www.electronics-lab.com/proje...20AMPLFIER.pdf
600W Audio Amplifier
POWER :
Maximum Output power @ 8ohms : 300watt
Absolute max power supply voltage :±38V to ±40V
Recommended power supply voltage :±30V to ±35V
GENERAL DISCRIPTION :
The circuit is based around {LM4702}manufactured by NATIONAL semiconductors&{MJ11029-MJ11028} by ON semiconductors It is a high fidelity audio power amplifier. Designed for demanding consumer and pro-audio applications. You can also use this circuit with AV receivers, Audiophile power amps, Pro Audio High voltage industrial applications etc Amplifier output power maybe scaled by changing the supply voltage and number of output devices. The circuit includes thermal shutdown circuitry that activates when the die temperature exceeds 150°c. CIRCUITs mute function, when activated, mutes the input drive signal and forces the amplifier output to a quiescent state.
http://www.electronics-lab.com/proje...UDIO%20AMP.pdf
200W Audio Amplifier
Output Power : 200Watts
Load Resistance : 8ohms
Input impedance : 55K
Maximum supply voltage : (+95v)-0-(-95v)
Recommended supply voltage : (+66v)-0-(-66v)
This complete high quality, low noise mono audio power amplifier is based around the Hybrid Integrated Circuit STK4050 manufactured by Sanyo. The circuit incorporates volume and has a maximum music output power of 200W.The circuit incorporates an on board power supply; therefore, only centre tapped transformer is required to power the circuit. I t has very good quality sound. U can use it with your Home Theatre your PC & etc... You can also use it as Subwoofer Amplifier. It is a compact package for THIN-TYPE Audio sets. Easy Heatsink design to disperse heat generated in THIN-TYPE audio sets. Constant-Current circuit to Reduce supply switch-ON and switch-OFF shock noise. External supply switch-On and switch-OFF shock noise muting, Load short-circuit protection, thermal shutdown and other circuits can be tailored-designed.
http://www.electronics-lab.com/proje...0AMPLIFIER.pdf
آمپلیفایر 300w
Power Amplifier 300W HIFI by MJ15004,MJ15003
http://up.iranblog.com/images/ylskll3v1hmg7c1u2fk.doc
مدار آمپلی با ماسفت قدرت ۱۰۰ وات
Output power (f=1 KHz, d=0.5 %): 100 W in 8 ohm
Supply voltage: ................ ñ 40 V
Quiescent current: ............. 50 mA
Maximum current: ............... 2.6 A
Sensitivity: . 600 mV
Frequency response: ............ 10-35000 Hz (-1 dB)
Distortion HD: ................. 0.01 %
Intermodulation dist.: ......... 0.02 %
Signal/noise: 83 dBConstruction
مدار امپلی100وات ۸ اهم های فیدلتی ماسفت
تو این مدار هم میتونین از ماسفت هم ازترانزیستور قدرت استفاده کنین(خود دانید!) راستی بیشتر از۴۵ولت هم دیگه بهش اعمال نکنینا!که وای به حالتون میشه.اگه مشکلی یا سوالی هم داشتین تونظرات مطرح کنین تا دراسرع وقت ژیگیری کنم.البته خودم هم چک میکنم
دوستان من 2 ماهی نیستم و میرم آموزشی سربازی.امیدورم مطالب من به دردتون خورده باشه.یا غلی
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