ffd

INTRODUCTION TO DARLINGTON PAIR In practice, the two transistors are put inside a single package and three terminals E, B and C are brought out as shown in figure. This three terminal device is known as darlington pair. It acts like a single transistor that has high current gain and high input impedence. DARLINGTON AMPLIFIER Darlington amplifier with voltage divider bias is shown in figure. In this circuit the output of one amplifier is coupled into the input of the next one by directly joining emitter of one transistor to the base of Other. Obviously, the emitter current of the first transistor becames the base current for the second transistor. The biasing analysis is similar to that of RC coupled Amplifier except that two Vbe drops are to be considered. ADVANTAGES OF DARLINGTON AMPLIFIER It uses very few components and can be readily formed from two adjacent transistors in an IC. It provides excellent Characteristics of high input impedence with low output impedence and high curren

In the circuit use a IC AN7171 . Minimum requirment  voltage is 12 volt and maximum voltage is 15  volt . Power output 2 X 30 W with impedance 4 Ohm . Speaker match woofer speaker , and operate it on the small room. This circuit matches variety of input device such us mixer , equalizer , tone control , processor , galaxy , bass boost , giga bass , and etc. This circuit schematic below : AN7171 amplifier schematic Output speaker is stereo , output couple with ground and add commponent resistor 2,2 Ohm and capacitor 100 nF.

The 600W Audio Amplifier Circuit Diagram 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. CIRCUIT’s mute function, when activated, mutes the input drive signal and forces the amplifier output to a quiescent state.  Simple 600W Audio Amplifier Circuit Diagram Power: Maximum Output power @ 8ohms : 300watt Absolute max power supply voltage :±38V to ±40V Recommended power supply voltage :±30V to ±35V

Amplifier circuit is very suitable for use in subwoofer amplifier system based on IC SI1030G. Amplfier has 30W output with 8 ohm impedance. Supply voltage required minimum of 12 volts and a maximum of up to 22 volts DC. Component List : R1 = 100K R2 = 1R C1 = 2.2uF C2 = 100uF C3 = 47uF C4 = 100nF C5 = 10uF C6 = 47uF C7 = 100uF IC = SI1020GL , SI1030G

Rotel SURROUND SOUND RECEIVER RSX-1057 Continuous Amplifier Power (five channels driven) 75 watts/ch (20-20k Hz, <0.05% THD, 8 ohms) Continuous Amplifier Power (two channels driven) 100 watts/ch (1kHz, <1.0% THD, 8 ohms, DIN) Power Requirements (AC) 120 volts, 60Hz (USA version) 230 volts, 50Hz (CE version) Rotel SURROUND SOUND RECEIVER  RSX-1056 Continuous Amplifier Power (five channels driven) 75 watts/ch (20-20k Hz, <0.05% THD, 8 ohms) Continuous Amplifier Power (two channels driven) 100 watts/ch (1kHz, <1.0% THD, 8 ohms, DIN) Power Requirements (AC) 115 volts, 60Hz (USA version) 230 volts, 50Hz (CE version) RSX1056 power schematic RSX1056 Power amplifier schematic and PWB RSX1057 Power schematic RSX1057 Power amplifer schematic and PWB

This project is an audio amplifier based on TDA2050 and LM1875. This is not an ordinary project, but an attempt to make a PCB that is suitable for TDA2050 and LM1875 and has all the necessary circuitry on board – power supply, speaker protection, delayed turn-on and fast turn-off. This is achieved using the convenient uPC1237 IC. TDA2050 and LM1875 are pin to pin compatible, the differences in their schematics are the values of a couple resistors and one capacitor. All this allows to make an universal circuit board, suitable for any of these two ICs. [ ]

This amplifier is the monophonic 270 watt Double barreled Amplifier. For the original article, I specified plus and minus 85 V dc power supply voltages. The voltage can be increased to about 93 V to obtain a power rating of 300 W. The amplifier can be built either as a stereophonic or a monoponic unit. My original amps were mono units because the heat sinks, transformer, and filter caps that I used were too large for a stereo amp. The circuit described on this page is a modification of the original Double Barreled Amplifier. The circuit has been simplified somewhat. The circuit board layout is smaller and much more compact. The driver transistors now mount on the circuit board instead of on external heat sinks. And the circuit has the feedforward compensation that I describe for the Low TIM Amplifier. If you build this amplifier, you must keep the wiring between the heat sinks and the circuit boards as short as possible if you don't want oscillation problems. When you test the circ

For mono output amplifier application,  TDA7056  IC can be your option. Compact but powerful, this integrated circuit is contained in a 9 pin medium power package. This device is designed f or battery fed portable equipments such as mono recorders, radios and television. To attract the market, TDA7056 has many features such as low power consumption. For more reliable operation, TDA7056 also has short circuit proof and ESD (Electro Static Discharge) protected on all pins.  Designing application with this IC should be easy since no external components is needed. To make sure you’ll love this chip, this device also has no switch on/off clicks. Overall, TDA7056 has good stability.  TDA7056 3W BTL Mono Audio Power Amplifier Circuit Diagram

22 Watt Stereo Amplifier circuit diagram. This circuit can be used for audio home amplifier and car audio amplifiers. It is extremely simple design, inexpensive and very easy to build. Even a newbie hobbyst will easy assemble this circuit. The scheme given here is a car stereo amplifier circuit can be used in That car or other vehicle. The circuit is based TDA1553, which is aClass-Baudioamplifier. As you can see this circuitisverysimple, consisting onlyof theICand thecapacitor6. Here is a circuit diagram of car stereo. This 20w car audio amplifier circuit described hereoffers a20 wattboosterthatwillallow youtorealize thepower amplifierwith which one canincrease the poweroutputfromthe carstereoup to20Wattsmaximum. The inputINis connected to theoutputof thereceiver, Uoutputis connectedto the speakeras shownoncaraudioamplifierscheme. via next.gr 22 Watt Stereo Amplifier circuit diagram.

Build a BTL Stereo Amplifier Circuit Diagram with TDA7052 , you can see circuit and start make a BTL Stereo Amplifier Circuit Diagram with TDA7052. BTL Stereo Amplifier Circuit Diagram with TDA7052 

30W GUITAR AMPLIFIER ELECTRONIC DIAGRAM This is design of 30W Guitar Amplifier ELECTRONIC DIAGRAM

Description: The NTE1373 is an integrated circuit designed for use as a 7.5W (16W, 4Ω) power amplifier output  with low noise and low distortion suitable for TV sets with multi−sound.  Stereo operation is possible due to incorporating two amplifiers on one 12−Lead SIP type chip. Features: Built−In Protection Circuits (Surge, Thermal Protection, etc.) Automatic Operating Point Stabilizer Circuit Low Distortion, Low 1/f Noise Low Shock Noise from Power ON/OFF Operation Better Channel Separation Few External Components Required

Here is a very simple and easy to use audio amplifier using I.C BEL (Bharat electronics limited)1895 , a very common IC. This circuit can run on 3V to 6v , making it easy to use in pocket amplifier . Cost is under 25/- Parts list: BEL1895 I.C (DIP8), C1 = 470uF/10V, C2 = 1000uF/16V, C3 = 220uF/10V, C4 = 100uF/10V, C5 = 4.7uF/10V, C6 = 47pF, C7,C8 = 1uF, R1 = 47Ohm, R2 = 470Ohm, R3 = 100K, R4 = 1Ohm, R5 = 10K V/C, speaker, etc… Total cost is around 20-30 rupeess(INR) or 0.6USD. 

LA4446 is of similar series IC as LA4440, but it is meant for dual or stereo 5.5Watt RMS outputs. While 4440 gives 6Watt outputs at dual mode, this gives almost same but with much smaller package size. The IC package is mall but it provides same functionality and special features like LA4440. These are, Low pop noise at power ON/OFF time Good ripple rejection: 46dB(typ) Good channel separation Low residual noise (Rg=0) On chip protectors as Thermal protector, Over-voltage/Surge Protector, and pin short protector The below circuit is the application circuit of LA4446 IC. 

12 V AUDIO AMPLIFIER WITH TRANSISTOR ELECTRONIC DIAGRAM In use, R9 should be carefully adjusted to provide minimal audible signal cross-over distortion consistent with minimal measured quiescent current consumption; a good compromise is to set the quiescent current at about 10-15 mA.To measure this current, wire a DC current meter temporarily in series with the collector of Q3. List Component P1_____________10K Log.Potentiometer R1,R2__________33K 1/4W Resistors R3_____________33R 1/4W Resistor R4_____________15K 1/4W Resistor R5,R6___________1K 1/4W Resistors R7____________680R 1/4W Resistor R8____________120R 1/2W Resistor R9____________100R 1/2W Trimmer Cermet C1,C2__________10µF 63V Electrolytic Capacitors C3____________100µF 25V Electrolytic Capacitor C4,C7_________470µF 25V Electrolytic Capacitors C5_____________47pF 63V Ceramic Capacitor C6____________220nF 63V Polyester Capacitor C8___________1000µF 25V Electrolytic Capacitor D1___________1N4148 75V 150mA Diode Q1____________BC

RF power amplifier IC is a type of electronic amplifier used to convert low-power radio frequency signal into a larger signal strength is important, usually for driving a transmitting antenna. This is usually optimized for high-efficiency, high output power (P1dB) of compression, loss of income on the input and output, better benefits, and optimal heat dissipation. RF power amplifier IC To make our amplifiers can also use transistors or IC OP Amp. In the op amp is actually a transistor that is in the form of a series so it's easier to use. Suppose that is used in the amplifier IC Op Amp 741 is a monolithic high performance electronic components that use Fairchild epitacial process. IC Op Amp 741 is an IC in which packed a differential circuit. The data sheet of IC Op Amp 741.

Mic Audio Amplifier Circuit Diagram.The compact, low-cost condenser mic audio amplifier described here provides good-quality audio of 0.5 watts at 4.5 volts. It can be used as part of intercoms, walkie-talkies, low-power transmitters, and packet radio receivers. Transistors T1 and T2 form the mic preamplifier.  Resistor R1 provides the necessary bias for the condenser mic while preset VR1 functions as gain control for varying its gain. In order to increase the audio power, the low-level audio output from the preamplifier stage is coupled via coupling capacitor C7 to the audio power amplifier built around BEL1895 IC.BEL1895 is a monolithic audio power amplifier IC designed specifically for sensitive AM radio applications that delivers 1 watt into 4 ohms at 6V power supply voltage.  It exhibits low distortion and noise and operates over 3V-9V supply voltage, which makes it ideal for battery operation. A turn-on pop reduction circuit prevents thud when the power supply is switched on. Cou

See figure below its power amplifier using transistor mosfet as amplifier. Mosfet Amplifier with power output 400W

The LM4610 is a DC controlled Tone (bass/treble), volume and balance circuit for stereo applications in car Radio TV and Audio systems. It also features Nationals 3D-Sound Cir- cuitry which CAN be externally adjusted via a simple RC Net- work. An additional control input allows loudness compensa- tion to be simply effected. Four control inputs pro visit page. Multi-channel Audio Codec With Stereo Headphone Amplifier

A 12 watt audio amplifier operating on a dual symmetrical supply of ± 12 volts. The 741 provides the required gain while the speaker drive is provided by the complementary Darlingtons T1, T2 and T3, T4.The input signals for the darlingtons are derived from the supply current of the 741. Since R6 is connected to the ground, the positive or negative signal currents also pass through R4 or R5. The voltage drop across these resistors serves as the input signal to the transistor pairs. An overall dc negative feedback from the common collector junction of T2 and T4 stabilises the dc conditions of the circuit and keeps the junction point at zero volts. Hence, no coupling capacitor is required for the speaker.  12W Amplifier Circuit Using 741 Op Amp Circuit Diagram PARTS LIST R1 10KΩ R2 4.7KΩ R3 270KΩ R4 1KΩ R5 1KΩ R6 47Ω 1W C1 50 Pf C2 0.01 µF T1 BC178 T2 2N6107 T3 AC108 T4 2N5294 IC LM741 LS1 50W 4Ω