TDA7294 150 W Power Amplifier

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TDA Amplifier Circuit stereo 150W

The TDA8950 is a high-efficiency Class D audio power amplifier. The typical output power is 2 × 150 W with a speaker load impedance of 4 Ω. The TDA8950 is available in both HSOP24 and DBS23P power packages. The amplifier operates over a wide supply voltage range from ±12.5 V to ±40 V and features low quiescent current consumption. The TDA8950 is a two-channel audio power amplifier that uses Class D technology. For each channel, the audio input signal is converted into a digital PWM signal using an analog input stage and a PWM modulator. To drive the output power transistors, the digital PWM signal is fed to a control and handshake block and to highand low-side driver circuits. This level-shifts the low-power digital PWM signal from a logic level to a high-power PWM signal switching between the main supply lines. A 2nd-order low-pass filter converts the PWM signal to an analog audio signal that can be used to drive a loudspeaker.

TDA Amplifier Circuit
TDA Amplifier Circuit 

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TDA Amplifier Circuit



Car subwoofer filter circuit

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Circuit description:
Here is the circuit diagram of a simple subwoofer filter that can be operated from a 12V DC supply. Such a circuit is very useful in automobile subwoofer applications. The circuit is nothing but a low pass filter whose pass frequency can be adjusted between 60 to 160 Hz. The circuit is designed around the TL072 dual BIFET opamp IC. Out of the two opamps inside the chip, IC1A is wired as a buffer. The left and right audio inputs after mixing is fed to the input of the IC1A using the DPDT switch S1. Switch S1 is the phase control switch which can be used to make the subwoofer in phase with other speakers. When S1 is in position 2, 180 degree phase shift will be induced.POT R7 can be used for controlling the level. IC1B forms the low pass filter whose pass frequency can be controlled by adjusting the dual gang POT R13.

Circuit Features:
  • The circuit can be powered from 12V DC.
  • IC1 must be mounted on a holder.
  • S1 is a DPDT switch.
  • R13 should be a dual gang linear POT.
  • C5 and C6 must be polyester capacitors.
  • POT R13 can be used for adjusting the pass frequency.
  • POT R7 can be used for adjusting the level.
Circuit diagram:

Car subwoofer filter


22 Watt Car Subwoofer Amplifier

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Circuit Description

     The stereo signals coming from the line outputs of the car radio amplifier are mixed at the input and, after the Level Control, the signal enters the buffer IC1A and can be phase reversed by means of SW1. This control can be useful to allow the subwoofer to be in phase with the loudspeakers of the existing car radio. Then, a 12dB/octave variable frequency Low Pass filter built around IC1B, Q1 and related components follows, allowing to adjust precisely the low pass frequency from 70 to 150Hz. Q2, R17 and C9 form a simple dc voltage stabilizer for the input and filter circuitry, useful to avoid positive rail interaction from the power amplifier to low level sections.
     This unit is intended to be connected to an existing car stereo amplifier, adding the often required extra "punch" to the music by driving a subwoofer. As very low frequencies are omnidirectional, a single amplifier is necessary to drive this dedicated loudspeaker. The power amplifier used is a good and cheap BTL (Bridge Tied Load) 13 pin IC made by Philips (now NXP Semiconductors) requiring a very low parts count and capable of delivering about 22W into a 4 Ohm load at the standard car battery voltage of 14.4V.

Circuit Diagram

Parts list:

  • P1_____________10K Log Potentiometer
  • P2_____________22K Dual gang Linear Potentiometer
  • R1,R4___________1K 1/4W Resistors
  • R2,R3,R5,R6____10K 1/4W Resistors
  • R7,R8_________100K 1/4W Resistors
  • R9,R10,R13_____47K 1/4W Resistors
  • R11,R12________15K 1/4W Resistors
  • R14,R15,R17____47K 1/4W Resistors
  • R16_____________6K8 1/4W Resistor
  • R18_____________1K5 1/4W Resistor
  • C1,C2,C3,C6_____4µ7 25V Electrolytic Capacitors
  • C4,C5__________68nF 63V Polyester Capacitors
  • C7_____________33nF 63V Polyester Capacitor
  • C8,C9_________220µF 25V Electrolytic Capacitors
  • C10___________470nF 63V Polyester Capacitor
  • C11___________100nF 63V Polyester Capacitor
  • C12__________2200µF 25V Electrolytic Capacitor
  • D1______________LED any color and type
  • Q1,Q2_________BC547 45V 100mA NPN Transistors
  • IC1___________TL072 Dual BIFET Op-Amp
  • IC2_________TDA1516BQ 24W BTL Car Radio Power Amplifier IC
  • SW1____________DPDT toggle or slide Switch
  • SW2____________SPST toggle or slide Switch capable of withstanding a current of at least 3A
  • J1,J2__________RCA audio input sockets
  • SPKR___________4 Ohm Woofer or two 8 Ohm Woofers wired in parallel

Technical data:

  • Output power (1KHz sinewave): 22W RMS into 4 Ohms at 14.4V supply
  • Sensitivity: 250mV input for full output
  • Frequency response: 20Hz to 70Hz -3dB with the cursor of P2 fully rotated towards R12, 20Hz to 150Hz -3dB with the cursor of P2 fully rotated towards R11
  • Total harmonic distortion: 17W RMS: 0.5% 22W RMS: 10%

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