Subwoofer Filter Circuit Diagram

General Description    

   This subwoofer active filter circuit is a 24 dB octave filter with a Bessel character and cutoff frequency of 200 Hz. So, if you are interested in experimenting with audio circuits in subwoofer range, this circuit is for you. In subwoofer range, all audio frequencies below 200 Hz can be fed to a single speaker box since the human directional perception of sound diminishes at this frequency range. The normal stereo signals above 200 Hz can be fed to 2 satellite speakers. How does the subwoofer filter works: A1 and A2 buffer the signals coming from right and left channels. Opamp combinations A2/A4 and A9/A10 function as the highpass filters. The outputs are then connected to the final amplifiers of the battelite boxes. Signals from both channels are fed to A5. Opamps A6/A7 function as the lowpassfilter, A8 as the output amplifier for the subwoofer signal. The signal level can be balanced between the subwoofer and the satellite lines. The power needed for this filter circuit must ne a symmetrical power supply. The opamps can have either JFET or bipolar inputs.

Cicuit Diagram

Subwoofer Filter Circuit Diagram

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Car Subwoofer Amplifier Circuit Diagram

Circuit Description:

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.

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.

Circuit diagram:

Parts circuit:

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%

Original article sourse: eeweb.com

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Subwoofer Filter Circuit Board

Cheap car subwoofer filter circuit description:

     This subwoofer filter set Suitable for use with a great car audio system. Since this circuit is designed to operate with a 12 volt DC power. But if you put it to use with a home stereo, It do not have any rules. This subwoofer circuit set is designed to has a cut off frequencies of 200 Hz. If you are not satisfied, you can change the C6, C7, C8, new, follow the table below.

      The left cannel input signal is entered pass through capacitors C1, C3 are the output Signal to the original circuit. (Or rear left in the car). And the right cannel input signal is entered to C2, C4 to the original circuit. (Or rear right in the car). Two resistors R1 and R2 will be mixer audio signal the left channel and the right channel both together. Then next wire connects to C5. This capacitor is also know as the coupling capacitor to inverting input of M5218A (IC1a). The VR1 serves as a set of IC1a gain with much or less as you want.
     The output signal is entered pass through the low pass filter circuit that consists of R5, R6, R7, R8, C6, C7, C8 and IC1b Which will allow low frequencies under 100 Hz passed away only. And the output from pin 1 of IC1b is entered to pass through R9, C9 on to the power amplifier circuit that be designed for driver only the subwoofer loud speaker We use the LM7812 IC2 as 12V dc fixed regulator for this circuit so can use the voltage supply range 12Vdc to 24Vdc as we want. The diode D1 is protector connection voltage supply that wrote terminal that it can damage the IC1.

Cheap car subwoofer filter circuit diagram:

Cheap car subwoofer filter pcb layout:

Cheap car subwoofer filter circuit partlist:

IC1_______________________________M5218A
IC2_______________________________LM7812 IC-regulator 12V
R1, R2, R3_______________47K_______Resistor 1/4W 1%
R4, R5, R6, R7, R10_______10K_______Resistor 1/4W 1%
R8______________________20K_______Resistor 1/4W 1%
R9______________________100 ohm__ Resistor 1/4W 1%
C1, C2, C3, C4, C5________ 4.7uF 63V _see text
C6______________________0.33uF 63V see text
C7______________________0.27uF 50V see text
C8______________________0.027uF 50V see text
C9, C10__________________10uF 16V see text
C11_____________________0.1uF 63V see text
C12_____________________ 100uF 16V Electrolytic Capacitors
C13_____________________ 100uF 25V Electrolytic Capacitors

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Subwoofer Filter Circuit Board

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

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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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