Car subwoofer filter circuit

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

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Auto Amplifier Wiring Diagram

In whis circuit is designed a simple connection between audio componets.

Auto Amplifier Wiring Diagram

from crutchfield.com

Subwoofer Amplifier Circuit 30W

 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

250 W Stereo Audio Amplifier Class-T

GENERAL DESCRIPTION:

The TA0103A is a 250W continuous average (4Ω ), two channel Amplifier Driver Module which uses Tripath’s proprietary Digital Power Processing (DPPT M ) technology. Class-T amplifiers offer bot h the audio fidelity of Class-AB and the power efficiency of Class-D amplifiers. 

Applications:

• Audio/Video 
• Amplifiers/Receivers 
• Pro-audio Amplifiers 
• Automobile Power Amplifiers 
• Subwoofer Amplifiers 
• Home/PC Speaker Systems

Circuit Amplifier:

250 W Stereo Audio Amplifier Class-T

50 Watt Subwoofer Amplifier

R1  200 Ohm 1/4 W Resistor
R2  200K 1/4 W Resistor
R3  30K 1/4 W Resistor
R5  1K 1/4 W Resistor
R6  5K 1/4 W Resistor
R7,R10  Meg (5%) 1/2 W Resistor
R8,R9  0.4 Ohm 5 W Resistor
R11  10K Pot
R12,R13  51K 1/4 W Resistor
R14  47K 1/4 W Resistor
C1  100uF 35V Electrolytic Capacitor
C2  0.011uF Capacitor
C3  3750pF Capacitor
C4,C6  1000pF Capacitor
C5,C7,C8  0.001uF Capacitor
C9  50pF Capacitor
C10  0.3uF Capacitor
C11,C12  10,000uF 50V Electrolytic Capacitor
U1,U2  741 Op Amp
U3  ICL8063 Audio Amp Transister Driver thingy
Q1  2N3055 NPN Power Transistor
Q2  2N3791 PNP Power Transistor
BR1  250 V 6 Amp Bridge Rectifier
T1  50V Center Tapped 5 Amp Transformer
S1  SPST 3 Amp Switch
S2  DPDT Switch
F1  2 Amp Fuse
SPKR1  8 Ohm 50W Speaker
MISC  Case, Knobs, Line Cord, Binding Posts Or Phono Plugs (For Input And Output), Heatsinks For Q1 And Q2

60W Subwoofer Amplifier Circuit

The output power: 40 w 8 ohm and 60 w 4 ohm load. Preamplifier is used in the same 60 v rails as the power amplifier gain blocks can implement two transistors can provide about 20 v RMS output. This provides a very high input overload. List at least the recommended value is C8. 3300μf capacitor or two 2200μf capacitors connected in parallel would be a better choice. Darlington transistor types of alternative has MJ11014 (Q3) and MJ11013 (Q4) or TIP142 (Q3) and TIP147 (Q4). T1 transformer can be also a 24 24 v or 25 25 v type (ie. 48 v or 50 v center tapped). SW1 switch insert low-cut feature when open. In all cases, Darlington transistors are used as the output device is essential that the transistor (Q2) pass in close thermal contact with the sensor output transistors as possible.

R1__________________6K8    1W Resistor
R2,R4_____________470R   1/4W Resistors
R3__________________2K   1/2W Trimmer Cermet
R5,R6_______________4K7  1/2W Resistors
R7________________220R   1/2W Resistor
R8__________________2K2  1/2W Resistor
R9_________________50K   1/2W Trimmer Cermet
R10________________68K   1/4W Resistor
R11,R12______________R47   4W Wirewound Resistors

C1,C2,C4,C5________47μF   63V Electrolytic Capacitors
C3________________100μF   25V Electrolytic Capacitor
C6_________________33pF   63V Ceramic Capacitor
C7_______________1000μF   50V Electrolytic Capacitor
C8_______________2200μF   63V Electrolytic Capacitor (See Notes)

D1_________________LED    Any type and color
D2________Diode bridge   200V 6A

Q1,Q2____________BD139    80V 1.5A NPN Transistors
Q3_____________MJ11016   120V 30A NPN Darlington Transistor (See Notes)
Q4_____________MJ11015   120V 30A PNP Darlington Transistor (See Notes)

SW1_______________SPST Mains switch

F1__________________4A Fuse with socket

T1________________220V Primary, 48-50V Secondary 75 to 150VA Mains transformer

PL1_______________Male Mains plug

SPKR______________One or more speakers wired in series or in parallel
                  Total resulting impedance: 8 or 4 Ohm
                  Minimum power handling: 75W

Car Subwoofer

Subwoofer Amplifier 100W

General Description

The TDA7293 is a monolithic integrated circuit in Multiwatt15 package, intended for use as audio class AB amplifier in Hi-Fi field applications, such as home stereo, self powered loudspeakers and Topclass TV. Thanks to the wide voltage range and to the high output current capability it is able to supply the highest power into both 4-Ω and 8-Ω loads.The built-in muting function with turn-on delay simplifies the remote operation avoiding on-off switching noises. Parallel mode is possible by connecting several devices and using pin11. High output power can be delivered to very low impedance loads, so   optimizing the thermal dissipation of the system.

Features:

• Multipower BCD technology
• Very high operating voltage range (±50 V)
• DMOS power stage
• High output power (100 W into 8 Ω 
• THD =10%, with VS = ±40 V)
• Muting and stand-by functions
• No switch on/off noise
• Very low distortion
• Very low noise
• Short-circuit protected (with no input signal applied)
• Thermal shutdown
• Clip detector
• Modularity (several devices can easily be connected in parallel to drive very low impedances)

Circuit diagram

LM3886 Audio Power Amplifier High-Performance 68W Audio Power Amplifier

The LM3886 is a high-performance audio power amplifier capable of delivering 68W of continuous average power to a 4Ω load and 38W into 8Ω with 0.1% THD+N from 20Hz–20kHz. The performance of the LM3886, utilizing its Self Peak In-stantaneous Temperature (˚Ke) (SPiKe™) protection cir-cuitry, puts it in a class above discrete and hybrid amplifiers by providing an inherently, dynamically protected Safe Op-erating Area (SOA). SPiKe protection means that these parts are completely safeguarded at the output against overvoltage, undervoltage, overloads, including shorts to the supplies, thermal runaway, and instantaneous temperature peaks. The LM3886 maintains an excellent signal-to-noise ratio of greater than 92dB with a typical low noise floor of 2.0µV. Itexhibits extremely low THD+N values of 0.03% at the rated

output into the rated load over the audio spectrum, and provides excellent linearity with an IMD (SMPTE) typical rating of 0.004%.

32W Subwoofer Amplifier

Circuit diagram for 32W subwoofer amplifier

1- Operational amplifier TDA2050 which is used in the main amplifier circuit

2- TDA1524 which is used in the pre-amplifier of the circuit.

3- I used the split DC power ±22V as an external supply. The main advantage of the split supply over the single supply is that it is filtered from both sides (+) and (-) terminals and has the proper grounding system which are caused to decrease the output noise of amplifier but u can use single supply too.

Subwoofer filter LM 741

Description for Subwoofer filter LM 741:

     If you like I want some more bass in your stereo, you can switch a subwoofer there. This is a speaker that only reflects the bass. Below is a circuit to ensure that the subwoofer gets really only the bass. 

This circuit is used between the signal source (mixer, CD player) and the amplifier. It is an active filter, better than passive filters which are generally mounted behind the amplifier. The circuit is mono because the bass for both channels are equal. The human ear can not yet determine the direction of this bass. 

The first 741 is used as a mixer amplifier. The gain is adjustable with P1. Then, the signal is applied to a second of the order Butterworth-filter. C A(C1 + C2) and C B (C3) can be calculate using the following formulas: where F k , the crossover frequency (the frequency at which filter stops the transmission of sound), pi = 3.1416, R = R3 = R4, F k in Hertz, and C. F. As shown, the filter is now set at 240 Hz. , the supply voltage must be symmetrical, + and - 12-15 V. A suitable diet is the Symmetric mini power supply . If you would like a better sound would have you two 741's replaced by an NE5532. The picture for the layout to be printed at 150DPI (= + / - 33x33mm).

Circuit Diagram:

subwoofer filter lm741 circuit diagram

Part-list:

• R1, R2 = 47 k
• R3, R4 = 4.7 K?
• R5, R6 = 100 Ω
• P1 = 47 k logarithmically
• C1-C3 = 100 nF
• IC1, IC2 = LM 741

Layout and PCB:

Subwoofer filter LM741 layout and pcb

Datasheet for LM741 and NE5532:
LM741 Operational Amplifier - Download
NE5532 Operational Amplifier - Download

Subwoofer Amplifier 40W

Description

This amplifier delivers massive power and uses one IC and two power transistors. The circuit consists of an amplifier IC (a TDA 2030A) and a power stage consists of two transistors.  Amplifier can be powered with an asymmetrical supply voltage of 12 to 44 V.

Circuit Diagram:

Subwoofer Amplifier 40W

Part-list:

• R1-R3, R7 = 100 K?
• R6 = 8,2 kW
• R4, R5, R8, R9 = 1.40 Ω 1%
• R10 = 1 Ω
• C1 = 470 nF
• C2 = 10 V μF/63
• C3 = 4.7 V μF/63
• C4, C5, C7 = 220 nF
• C6 = 2200 V μF/50
• C8 = 1000 V μF/50
• D1, D2 = 1N4001
• T1 = BD712 or BD912
• T2 = BD711 or BD911
• IC1 = TDA2030A
• LS = speaker - 4/8 Ω
• Cooling = Fisher SK08/75

Power Amplifier 300W

POWER OUTPUT:

• 200W rms/8 ohm 
• 310W rms/4 ohm
• 800W rms/8 ohm (Bridge mode)

FREQUENCE RESPONSE 

• 20HZ-20KHZ +/-0.5dB 

INPUT SENSITIVITY 

• 1V for 200W/300W 

HUM AND NOISE

•  -105dB 

THD 

• <0.1% 

DAMPING FACTOR

•  65

Part list:

R1-19= 1Kohm 5W	R34-35= 0.1ohm 5W	C14-17= 100uF 100V
R2-3= 4.7Kohm	R36-43= 39ohm	C15= 100nF 250V polyester
R4-5= 22ohm	R37-42= 5.6Kohm 1W	Q1-2-3= BC547
R6-14= 10Kohm	R38-41= 220ohm 5W	Q4-5-6= BC557
R7-8= 1Kohm	R39-40= 0.1ohm 5W	Q7-11-12= BD140 or BC640
R9-23*=10K ohm	R44-45= 0.1ohm 5W	Q8= BC549
R10= 10ohm *see circuit sch.	R46= 4.7ohm 2W	Q9-10-15= BD139 or BC639
R11-13= 2.2Kohm	R47= 100ohm	Q13-14= MJ15004
R12= 22Kohm	C1= 2.2uF 25V	Q16-17= MJ15003
R15-16= 22ohm	C2-6= 330pF ceramic	TR1= 2K2 Trimmer
R17-18=  4.7Kohm	C3-8= 100uF 100V	F1-2= 5A Fuse Fast
R20-25= 390ohm	C4-9= 100nF 250V	D1-3= 5.1V 0.5W Zener
R21= 6.8Kohm	C5= 100nF 100V polyester	D2= 62V/5W Zener or 47v and 15V in series
R22=  4.7Kohm	C7= 100uF 25V	D4-5= 1N4004
R24-26-33= 220ohm	C10= 1.5nF 100V polyester	L1=10 turns diameter 1mm in 15mm diameter tube
R27-32= 100ohm 1W	C11-12= 1.5nF 100V polyester
R28,29,30,31= 100ohm	C13-16= 100nF 250V polyester	*Use R23=6k8 for 4 ohm loudspeakers

Subwoofer amplifier TDA7293

Features

Multipower BCD technology
Very high operating voltage range (±50 V)
DMOS power stage
High output power (100 W into 8 Ω
THD =10%, with VS = ±40 V)
Muting and stand-by functions
No switch on/off noise
Very low distortion
Very low noise
Short-circuit protected (with no input signal applied)
Thermal shutdown
Clip detector
Modularity (several devices can easily be connected in parallel to drive very low impedances)

Description

The TDA7293 is a monolithic integrated circuit in Multiwatt15 package, intended for use as audio class AB amplifier in Hi-Fi field applications, such as home stereo, self powered loudspeakers and Topclass TV. Thanks to the wide voltage range and to the high output current capability it is able to supply the highest power into both 4-Ω and 8-Ω loads. The built-in muting function with turn-on delay  simplifies the remote operation avoiding on-off switching noises. Parallel mode is possible by connecting several  devices and using pin11. High output power can  be delivered to very low impedance loads, so optimizing the thermal dissipation of the system.

Circuit Diagram

Audio amplifier circuit TDA7293

Layout

Layout for audio circuit TDA7293

 PCB

PCB for audio circuit TDA7293

200W Power Amplifier

This 200W power amplifier circuit using IC STK 4050.  STK 4050 is a power amplifier module is very powerful, because the IC is already a module then only needed a little extra components to build a reliable 200W Power Amplifier. Here is a picture series of Power Amplifier ICs 200W use STK 4050 complete with its power supply:

Audio Amplifier LM386

Audio Amplifiers with LM386




The LM386 is a versatile, small power amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external part count low, but with the addition of an external resistor and capacitor between pins 1-8 the gain can be set to any value from 20 to 200.

The inputs are ground referenced and the output automatically biases to one-half the supply voltage. The quiescent power drain is only 24 milliwatts when operating from a 6 Volt supply, making the LM386 ideal for battery operation.



To make the LM 386 a more versatile amplifier, 2 pins (pin 1 and 8) are provided for gain control. With pins 1 and 8 open the internal 1.35k resistor sets the gain at 20 (26 dB). If a capacitor is placed between pin 1-8, bypassing the built-in 1.35k resistor, the gain will go up to 200.

If a resistor is placed in series with the capacitor, the gain can be set to any value from 20 to 200. Gain control can also be done by capacitively coupling a resistor or FET transistor from pin 1 to the ground.

Simple audio amplifier schematics with LM386

• Operating Supply Voltage (VS) = 4v - 12v 
• The output power (POUT) for LM386N-1, LM386M-1 at VS = 6V, RL = 8ohms, 
• THD = 10% is 250-325 mW for LM386N-3 at VS = 9V, RL = 8ohms, 
• THD = 10% is 500-700 mW for LM386N-4 at VS = 16V, RL = 32ohms, 
• THD = 10% is 700-1000 mW. 

Fig 1: LM386 Audio Amplifier with Gain = 20 and minimum part count


Fig 1: LM386 Audio Amplifier with Gain = 200


Fig 1: Audio Amplifier with bass boost

200W Subwoofer Amplifier Circuit

Circuit Description

Here is a circuit that uses a mosfet amplifier amplicable for subwoofer as the main booster, or the basis of this boosterAmplifier. Circuit which uses MOSFET Power Amplifier is powered by the output more than 200W Speaker 8 Ohm impedance. We also include a suitable power supply circuit with the use of MOSFETamplifier with 200W of power, not only of his course Schematic diagram for the layout design is also already there.

Amplifier Circuit Diagram

Amplifier Circuit Diagram

200W Mosfet Amplifier LAyout PCB

200W Mosfet Amplifier LAyout PCB

Regulator Circuit Diagram MOSFET AMPLIFIER

Regulator Circuit Diagram MOSFET AMPLIFIER

Regulator PCB MOSFET amplifier

Regulator PCB MOSFET amplifier