Wednesday, August 22, 2012

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22 Watt Car Subwoofer Amplifier

This Subwoofer circuit 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 BTL TDA1516BQ IC made by Philips 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. 
22 Watt Car Subwoofer Amplifier Circuit
 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.

List Componet  Of Car Subwoofer Amplifier 
P1           : 10K  Potentiometer
P2           : 22K  Dual 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
C4,C5        : 68nF Polyester Capacitors
C7           : 33nF Polyester Capacitor
C8,C9        : 220µF/25V
C10          : 470nF Polyester Capacitor
C11          : 100nF Polyester Capacitor
C12          : 2200µF/25V
D1           : LED  
Q1,Q2        : BC547 NPN Transistors
IC1          : TL072 Op-Amp
IC2          : TDA1516BQ 
SW1          : DPDT toggle or slide Switch
SW2          : SPST toggle or slide Switch 
SPKR         : 4 Ohm Woofer or two 8 Ohm Woofers wired in parallel

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