LM4702 Amplifier Circuit Diagram

LM4702 general description:

     The LM4702 is a high fidelity audio power amplifier driver designed for demanding consumer and pro-audio applications. Amplifier output power may be scaled by changing the supply voltage and number of output devices. The LM4702 is capable of delivering in excess of 300 watts per channel single ended into an 8 ohm load in the presence of 10% high line headroom and 20% supply regulation. The LM4702 includes thermal shut down circuitry that activates when the die temperature exceeds 150°C. The LM4702's mute function, when activated, mutes the input drive signal and forces the amplifier output to a quiescent state. The LM4702 is available in 3 grades that span a wide range of applications and performance levels. The LM4702C is targeted at high volume applications. The LM4702B includes a higher voltage rating along – LM4702A (1) (in development): with the tighter specifications. The LM4702A(1) (in ±20V to ±100V development) is the premium part with the highest voltage rating, fully specified with limits over voltage – LM4702B: ±20V to ±100V and temperature, and is offered in a military 883 – LM4702C: ±20V to ±75V compliant TO-3 package.

LM4702 features:

• Very High Voltage Operation
• Scalable Output Power
• Minimum External Components
• External Compensation
• Thermal Shutdown and Mute

LM4702 applications:

• AV Receivers
• Audiophile Power Amps
• Pro Audio
• High Voltage Industrial Applications

LM4702 circuit diagram:

Typical Audio Amplifier Application Circuit

LM4702 layout and pcb:

LM4702 layout

LM4702 bottom pcb

LM4702 top pcb

LM4702 Audio Power Amplifier Datasheet - Download

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TDA7265 subwoofer circuit diagram

TDA7265 description:

     The TDA7265 is class AB dual Audio Amplifier assembled in the multi watt package specially designed for high quality sounds application as Hi-Fi music centers and stereo TV sets

TDA7265 features:

• WIDE SUPPLY VOLTAGE RANGE (UP TO±25V ABS MAX.)
• SPLIT SUPPLY
• HIGH OUTPUT POWER 25 + 25W @ THD =10%, RL = 8Ω, VS = +20V
• NO POP AT TURN-ON/OFF
• MUTE (POP FREE)
• STAND-BY FEATURE (LOW Iq)
• SHORT CIRCUIT PROTECTION
• THERMAL OVERLOAD PROTECTION

TDA7265 amplifier circuit:

TDA7265 amplifier circuit

TDA7265 pcb

Searches related to TDA7265tda7265 amplifier circuittda7265 voltagetda7265 subwoofer circuit diagramtda7265 pcb layouttda7265 equivalenttda7265 single supplytda7265 power supplytda7265 amp circuitThe TDA7265 is class AB Dual Audio Power amplifier assembled in the @ Multiwatt package, specially designed for high quality sound application as Hi-Fi 

TDA2030 Audio Amplifier 1 x40W

TDA2030 general description: 

    Although there are a number of hybrid output modules on the market, very few of them combine compactness with reasonable price and good performance. One of these few is SGS's used in the present amplifier. The design of the amplifier is straightforward: a power op-amp followed by two output transistors. The audio signal is applied to the non-inverting input of power op-amp IC1 TDA2030 via socket K1 and capacitor C1. The supply current to the IC varies in accordance with the input signal. Consequently, there will be a similarly varying voltage drop across resistors R6, R7, R8, and R9 since these are in the supply lines to the op-amp. As long as the current is lower than about 1A, the voltage drop across the resistors will be insufficient to switch on transistors T1 and T2. This means that outputs up to 2 W into 4 ohm are provided entirely by the op-amp. Once the output current exceeds a level of 1A, the transistors are on and contribute to the power output.

When the Input signal is small, there no quiescent current through the transistor, but there is through the op-amp. Crossover problems are thus obviated. Since the IC also provides thermal compensation, stability of the operating point is ensured.

The supply voltage may lie between 12 V and an absolute maximum of 44 V. Construction of the amplifier on the printed-circuit board should be straightforward. The transistors as well as the IC must be fitted insulated on to a heat sink of about 2 k W. Use plenty of heat conducting paste. The supply line should be protected by a 3.15 A fuse. You can use BD911, BD912 for T1 and T2.

TDA2030 Technical Data:

• Supply voltage  - 44 V
• Maximum output - 22 W into 8 Ohm
• Maximum output - 44 W into 4 Ohm

TDA2030 Circuit diagram:

 

TDA2030 circuit diagram

TDA2030 pcb layout:

TDA2030 pcb and layout

TDA2030 parts list:

Resistors:

• R1-R4 - 100 KOhm
• R5 - 8.2 KOhm
• R6 - R9 - 1.4 Ohm, 1%
• R10 - 1 Ohm

Capacitors:

• C1 - 470 nF
• C2 - 10 uF, 63 V, radial
• C3 - 4.7uF, 63 V, radial
• C4,C5,C7 - 220 nF
• C6 - 2200 uF, 50 V, radial
• C8 - 100 uF, 50 V, radial

Semiconductors:

• D1, D2 - 1N4001
• T1 - BD712
• T2 - BD711
• IC1 - TDA2030

Datasheet for TDA2030: Download

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LM1875 AUDIO AMPLIFIER 20W

LM1875 general description:

LM1875 pcb layout

The LM1875 is a monolithic power amplifier offering very low distortion and high quality performance for consumer audio applications. The LM1875 delivers 20 watts into a 4Ω or 8Ω load on ±25V supplies. Using an 8Ω load and ±30V supplies, over 30 watts of power may be delivered. The amplifier is designed to operate with a minimum of external components. Device overload protection consists of both internal current limit and thermal shutdown.The LM1875 design takes advantage of advanced circuit techniques and processing to achieve extremely low distortion levels even at high output power levels. Other outstanding features include high gain, fast slew rate and a wide power bandwidth, large output voltage swing, high current capability, and a very wide supply range. The amplifier is internally compensated and stable for gains of 10 or greater.

LM1875 amplifier circuit:

LM1875 AUDIO AMPLIFIER 20W

LM1875 power supply diagram:

LM1875 power supply diagram

LM1875 pcb layout:

LM1875 pcb layout

LM1875 project review:

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TDA8947J Audio Amplifier 29W

TDA8947J general description:

The TDA8947J contains four identical audio power amplifiers. The TDA8947J can be used as: four Single-Ended (SE) channels with a fixed gain of 26 dB, two times Bridge-Tied Load (BTL) channels with a fixed gain of 32 dB or two times SE channels (26 dB gain) plus one BTL channel (32 dB gain) operating as a 2.1 system The TDA8947J comes in a 17-pin Dil-Bent-Sil (DBS) power package. The TDA8947J is pin compatible with the TDA8944AJ and TDA8946AJ. The TDA8947J contains a unique protection circuit that is solely based on multiple temperature measurements inside the chip. This gives maximum output power for all supply voltages and load conditions with no unnecessary audio holes. Almost any supply voltage and load impedance combination can be made as long as thermal boundary

conditions (number of channels used, external heatsink and ambient temperature) allow it.

TDA8947J features:

• SE: 1 W to 25 W, BTL: 4 W to 50 W operation possibility (2.1 system)
• Soft clipping
• Standby and Mute mode
• No on/off switching plops
• Low standby current
• High supply voltage ripple rejection
• Outputs short-circuit protected to ground, supply and across the load
• Thermally protected
• Pin compatible with TDA8944AJ and TDA8946AJ

TDA8947J applications:

• Television
• PC speakers
• Boom box
• Mini and micro audio receivers

TDA8947J amplifier diagram:

TDA8947J layout:

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LX1720 Audio Amplifier 2x20W

LX1720 general description:

The LX1720 controller IC contains the necessary functions to implement a stereo Class-D audio amplifier. A Class-D amplifier is a "switching" amplifier that converts a low-level, analog, audio input signal into a highpower, pulse-width modulated (PWM) output. The switching frequency is much higher than the audio band which allows high frequency out-of-band components to be removed with a simple LC filter. The LX1720 generates a PWM output by controlling external MOSFET's connected in a full-bridge configuration. Because the MOSFET's are either full "on" or full "off", their power dissipation is minimal allowing maximum power to be delivered to the speaker.

LX1720 Circuit:

LX1720 Audio Amplifier 2x20W