AmplifierCircuits

STK4221   g eneral description: The STK4221II IC from SANYO is a dual high power amplifier chip, preferably suited for compact high power audio applications, for example in cars and luxury transport vehicle audio systems. The chip provides a hassle free stereo output through a single package and a hand full of few external components, making the construction of this circuit rather easy and straightforward. However since the idea presented here does not include a CD or a memory card driver circuit, the input may be derived from readymade audio sources like an ipod, CD walkman, cellphone etc. The circuit discussed here is intended specifically for car audio applications and provides a simple alternative for  making a 100 watt car stereo amplifier circuit. The diagram may be understood with the following points: An RC network formed by R5, R6 and C3, C4 together helps to reduce and filter stray frequency interferences and is therefore included at the input of th...

TDA1015   g eneral description: The TDA1015 is a monolithic integrated audio amplifier circuit in a 9-lead single in-line (SIL) plastic package. The device is especially designed for portable radio and recorder applications and delivers up to 4 W in a 4Ω load impedance. The very low applicable supply voltage of 3,6 V permits 6 V spplications. TDA1015  features : single in-line (SIL) construction for easy mounting separated preamplifier and power amplifier high output power thermal protection high input impedance low current drain limited noise behaviour at radio frequencies TDA1015  reference data : Supply voltage range VP 3,6 to 18 V Peak output current IOM max. 2,5 A Output power at dtot= 10% VP = 12 V; RL = 4 Ω Po typ. 4,2 W VP = 9 V; RL = 4 Ω Po typ. 2,3 W VP = 6 V; RL = 4 Ω Po typ. 1,0 W Total harmonic distortion at Po = 1 W; RL = 4 Ω dtot typ. 0,3 % Input impedance preamplifier (pin 8) |Zi | > 100 kΩ...

TDA7490   g eneral description: The TDA7490 is a dual audio class D amplifier assembled in Flexiwatt 25 package; it is specially designed for high efficiency application mainly for TV and Home Stereo sets.   TDA7490 Audio Amplifier 2 x 25W / 1 x 50W TDA7490  features : 25W + 25W OUTPUT POWER: RL = 8Ω/4Ω; THD = 10% HIGH EFFICIENCY WIDE SUPPLY VOLTAGE RANGE (FROM ±10 TO ±25V) SPLIT SUPPLY TURN OFF/ON POP FREE ST-BY AND MUTE FEATURES SHORT CIRCUIT PROTECTION ACROSS THE LOAD THERMAL OVERLOAD PROTECTION EXTERNALLY SINCHRONIZABLE BRIDGE CONFIGURATION TDA7490  sterio circuit diagram : TDA7490 Audio Amplifier 2 x 25W / 1 x 50W circuit diagram TDA7490  mono circuit diagram : TDA7490 Audio Amplifier 2 x 25W / 1 x 50W mono circuit diagram TDA7490  sterio circuit pcb : TDA 7490 pcb layout 

TDA7594 general description:      The Type IC TDA7294 from SGS-Thomson is an integrated a.f. amplifier intended for use in all sorts of hi-f application. According to the manufacturer's data sheets, chip can deliver outputs of up to 100 watt. Considering other properties, such as low noise, low distortion and reliable short-circuit and thermal protection circuits as well, the chip is indeed an interesting one. Moreover, with peak supply voltages of ±40 V and a load impedance of 4 ohm, the maximum dissipation of the IC TDA7294 will easily be exceeded. For these reasons, the supply in the present amplifier has been kept down to a safe ±30 V. At these voltages, the chip delivers, without any difficulty, 50 W into an 8 ohm load and 80 W into a 4 ohm load. These are still very respectable figures, particularly in view of the reasonable IC price. The circuit diagram of the amplifier in shows that the IC TDA7294 needs only a small number of external components. The input ...

In whis circuit is designed a simple connection between audio componets. Auto Amplifier Wiring Diagram from crutchfield.com

TL071 MOSFET Audio Amplifier    g eneral description:       This simple mosfet power audio amplifier circuit, with TL071 and 2 mosfets (IRF9530, IRF530) power amplifiers can deliver up to 45W on 8 ohm. This schematic is based on Siliconix application and is based on variations of voltage on the 2 resistors serial inserted on the voltage supplier of the operational amplifier driver.  The mosfet transistors must be mounted on a heatsink at least 1K/W.   Amplifier efficiency is 70%, distortions at cut frequency were at most 0.2% at 20Hz on 8 ohm and 10W. With a power supply of +/- 30V the mosfet audio amplifier can deliver 45W on 8 ohm and 70w on 4 ohm. Remember that this audio amplifier is not protected on short circuits so every time you switch on check to see if the speaker is connected. MOSFET Audio Amplifier    Circuit diagram:

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