Car Subwoofer Driver

22W into 4 Ohm power amplifier
Variable Low Pass Frequency: 70 - 150Hz

Parts:

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


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) 13pin IC made by Philips 

(now NXP Semiconductors) requiring a very low
parts count and capable of delivering about 22W 

into a 4 Ohm load atthe standard car battery voltage 

of 14.4V.

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