High quality stereo HI-FI combo amplifier 04

 (4) The power amplifier
    TDAis2i made of A1521 is a famous product of Philips, with a rated output power of 15w×2. Although the output power is not very large, it is enough for
family listening to music. In order to improve the power usage, before TDA1521 Plus a positive and negative phase
amplifier with a gain of about 5 times. TDA1521 performs well, the sound is beautiful, and the music is smoother. The disadvantage is that the positioning sense of the sound and image is slightly worse. 9
TDA15 21 is a two-channel integrated circuit, and the working limit is The voltage is ±20V, and ±16V is often used. When in use, the secondary voltage of the transformer
is double 12V, and the power is about 35W.