L31, 30W Stereo Power Amplifier TDA1521


This is the circuit of 30W stereo amplifier. It is small and compact stereo amplifier is powerful but can easily be used to replace your broken amplifier or new construction, or to make an active speaker.


Using only active component (the right and left channel and IC1 TDA1521 monolithic integrated circuit, which contains a double line-end audio amplifier completely is integrated each capable of providing from 10 to 12W to the load 8ohm or 15W into 4ohms (30W music). Voltage gains of the amplifier is fixed at 30 db.

Specifications-

  • Power supply: 12 V symmetrical dual voltage

  • Maximum Power Output RMS: 2 x 15W / 4 ohms

  • Maximum power output music: 2 x 30 W / 4 ohms

  • Input sensitivity: 300 mV / 20 kilo ohm

  • Frequency: 7 Hz to 60 kHz (-3 dB)

  • 70 dB for each channel

  • Output power (R = 8 ohms): 2 x 10 W RMS

  • Output power (R = 4 ohms): 2 x 15 W RMS

  • Bandwidth (-3 dB): 7 to 60 000 Hz

  • Sensitivity to maximum power (8 ohms): 290 mV rms.

  • Sensitivity to maximum power (4 ohms): 250 mV rms.

  • Input impedance: 20 kilo-ohms

  • High quality stereo amplifier

  • Low noise

  • Protection against overload

Parts list-

  • R1 = 8.2 Ω 1/4 W

  • R2 = 8.2 Ω 1/4 W

  • C1 = 22nf ceramic

  • C2 = 22nf ceramic

  • C3 = 100nf multilayer

  • C4 = 1uf 63 V Polyester

  • C5 = 1uf 63 V Polyester

  • C6 = 4700uf 25 V electrolytic

  • C7 = 4700uf 25 V electrolytic

  • D1 = 1N5404

  • D2 = 1N5404

  • D3 = 1N5404

  • D4 = 1N5404

  • IC1 = TDA1521

Note- For IC’s protection used a Heat Sink. To reduce its heating effect.

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