300W Subwoofer Power Amplifier

This is an amplifier circuit that is formed from a transistor amplifier miraculous. This circuit is used in the speaker subwoofer with 300W maximum power on each side. To apply it, can be used in the room that is not too large, like the car. And the voltage needed between 25 to 42 Volt DC.

300W Subwoofer Power Amplifier

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Mosfet Amplifier Circuit for Subwoofer 400W

Power amp 400W IRFP448 Circuit
Amplifier circuit today,We would like to show you for the MOSFET 400 watt amplifier is amplifier on my kW shares the same circuit and basic PCB layout.
The only real difference is the number of output devices to the device.
We have using The IRFP448 design while the MOSFET amplifier 14 O / P devices.
These amplifiers can be used for virtually any application that requires high performance, low use Noise, distortion and excellent sound quality. Examples would be subwoofer amplifier should FOH stage
Amplifiers, surround a canal a very powerful sound amplifier, etc.
The 400W MOSFET-amplifier has four key stages of amplification. We are looking to start any Phase appropriate detail.
The bias and buffer stage
As the name suggests All Q ,C and ZD the Bias and buffer phases. Its main goal is to provide a stable MOSFET Gates and offset voltage and the voltage buffer amplifier stage of the High Resource capacity. What would have without the phase response and the effect
Slew rate is indeed very bad. The flip side of the coin is not the extra step
Introduction of an additional dominant pole in the amplifier feedback loop.

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HIFI Headphone Amplifier Circuit Diagram

HIFI Headphone Amplifier Circuit Diagram

This 1-watt amplifier leads itself par excellence for usa as driver for a low impedance headphone or as output stage in a hi-fi preamplifier driving an active loudspeaker. The schematic of this amplifier consists of an opamp type LF356 and a push-pull transistor output stage. Low-pass filter R1/C2 at the input limits the slew rateof the input signal. The fixed quiescent current of 30 mA draw by the output transistors, and set by diodes D1…D4 in conjuction with emitter resistors R7 and R8, ensures very low crossover distorsion.

HIFI Headphone Amplifier Circuit Diagram

Feedback resitors R3 and R4 fix the gain at about 15dB. The consequent overall distortion with a 3dB bandwidth from 10 Hz to 30 Hz is only 0.1 percent.
The amplifier delivers a maxiumum powder of 1 watt into 8 ohm for an input signal of about 500 mV rms. High-impedance headphones and 4 ohm loudspeakers may also be connected withoutdetriment.
The amplifier is best build on the printed circuit boar shonw bellow. The two transistors (BD139, BD140) shoud be mounted on heat sinks - do not forget the insulating washers and the head conducting paste!

To drive high-imperdance headphones at high volume, you need a +/- 15 volts regulated powder supply

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Audio Power Amplifier IC LM Series

Audio Power Amplifier 170W LM4651

The combination of the LM4651 driver IC and the LM4652 power MOSFET Class D power amplifier IC provides a high efficiency amplifier solution, suitable for self-powered speakers, subwoofers and quality car boosters.

The LM 4651 is a fully integrated conventional pulse width modulator (PWM) driver, containing undervoltage, short circuit, overmodulation, and thermal shutdown protection circuitry. The IC features a standby function which shuts down the pulse width modulation, minimizing supply current.

The LM 4652 is a fully integrated H-bridge Power Mosfet IC in a TO220 power package. The IC has a built in temperature sensor to alert the LM4651 when the die temperature exceeds the threshold limit.

Used together, the LM4651 and LM4652 form a simple, compact, efficient, high quality power audio amplifier solution complete with protection, normally seen only in Class AB amplifiers.

The maximum efficiency of this circuit is 85% at 125W with a standby attenuation greater than 100dB. The THD at 10W, 4 ohms, 10 - 500Hz is max. 0.3%. The supply voltage can not exceed ± 22V.



For the best performance a suitable preamplifier is required. With the addition of a preamplifier the gain of the power stage can be greatly reduced to improve performance. The gain should be set to 10 V/V allowing for low gain on the Class D stage with a total system gain high enough to be a complete solution for line level sources.

The input filter used here does not noticeably increase THD performance but will help to maintain a flat frequency response as the Q of the output filter changes with load impedance.



Do not attempt to build this amplifier as your first project! Class D high power amplifiers are expensive, difficult to build and a very small error during assembly can lead to total devastation of the power IC or other costly components.

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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