2 x 15 watt stereo audio power amplifier circuits based TDA1521

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, in all cases combined with a preamplifier. With remarkable features make it the true Hi-Fi amplifier.
Using only active component (the right and left channel) Philips TDA1521 monolithic integrated circuit, which contains a double line-end audio amplifier completely independent, each capable of providing from 10 to 12 W to the load 8 ohm or 15 W into 4 ohms (30 W music). Voltage gains of the amplifier is fixed at 30 dB.
2x15w stereo power amplifier circuits with TDA1521

  SPECIFICATIONS :
- Power supply: 12 V symmetrical dual voltage
- Maximum Power Output RMS: 2 x 15W / 4 ohms, 2 x 10 W / 8 ohms
- Maximum power output music: 2 x 30 W / 4 ohms
- Harmonic Distortion: 0.007% (1 W / 1 kHz)
- Input sensitivity: 300 mV / 20 kOhms
- 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 mVrms
- Sensitivity to maximum power (4 ohms): 250 mVrms
- Input impedance: 20 kilohms
- S / N Ratio: 98 dB
- Crosstalk: -70 dB
- 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 …. 22 nF ceramic
C2 …. 22 nF ceramic
C3 …. 100 nF multilayer
C4 …. 1 uF 63 V Polyester
C5 …. 1 uF 63 V Polyester
C6 …. 4700 uF 25 V electrolytic
C7 …. 4700 uF 25 V electrolytic
D1 …. 1N5404
D2 …. 1N5404
D3 …. 1N5404
D4 …. 1N5404
U1 …. TDA1521

Miscellaneous :
1 …… heatsink (Rth less than 3.3 ° C / W)
2 …… 3MA bolts 12 mm Unless otherwise specified, all
resistors are 1/4 W 5%

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