Wednesday, December 09, 2015

Subwoofer Power Amplifier 40W

This amplifier build for subwoofer speaker system. This amplifier using TDA2030 and 2 transistor to driver nd boost the power output.Output Power is about 40W supply voltage of 12 to 44 V. Very simple subwoofer amplifier but so must powerfull.

Subwoofer Power 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

Electronic Circuit is a good site for hobbyist also who would like to try DIY because it shared good circuits. If you have a personalized circuit requirement you may feel free to request it through the comment box or contact me.


I use 1 ohm resistor instead of 1.40 ohm

Its okay, the value of resistor ou can use 1Ohm - 10Ohm

Where to place the potentiometer

Hello cherian,

you can add the potentiometer before input amplifier, better adding tone control circuit for best adjusting tone and volume of power amplifier. Use the subwoofer module 4558 for filtering subwoofer.

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Need help!
I replace T1、T2 with TIP2955、TIP3055, it works fine,I can hear music. But TIP2955 and TIP3055 seems have no effect in the circuit and still cool all time! I do'nt know why? Is that normal or not?


yes its normal, if you use tip2955/tip3055 because the transistor more strenght than on the circuit.

saludos.. voy a hacerlo,, y a montarlo como prueva,,