30W Stereo power amplifier based TDA 1521

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.
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?Vélectrolytique
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%

Source:http://www.hqew.net/circuit-diagram/30W-Stereo-power-amplifier-based-TDA-1521_12051.html