Tuesday, January 19, 2010

Driver + Amplifier Sub Woofer

This Driver + Amplifier Sub Woofer circuit can be connected to an existing car stereo amplifier, adding the often required extra "punch" to the music by driving a subwoofer. As low frequencies are omnidirectional, a single amplifier is necessary to drive this dedicated loudspeaker.

List Componet

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

The power amplifier used is a good and cheap BTL
(Bridge Tied Load) 13 in 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.


  • IC2 must be mounted on a suitable finned heatsink
  • Due to the long time constant set by R17 and C9 in the dc voltage stabilizer, the whole amplifier will become fully operative about 15 - 30 sec. after switch-on.


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