Collection Schematic

  The Type TDAl52l from Valvo/Mullard is an integrated HiFi stereo power amplifier designed for mains fed applications such as stereo TV The device works optimally when fed from a j 16V supply; and delivers a maximum output power of 2x12 W into 8 Q.
The gain of the amplifiers is fixed internally at 30 dB with a spread of 0.2 dB to ensure optimum gain balance between the channels. A special feature of the chip is its built-in mute circuit, which disconnects the non-inverting inputs when the supply voltage g is less than j 6Vj a level at which the amplifiers are still correctly biased. This arrangement ensures the absence of unwanted clicks and other noise when the amplifier is switched on or off. The TDAl52l is protected against output short circuits and thermal overloading. The SIL9 package should be bolted onto a heat- sink with a thermal resistance of no more than 3.3 K/W (R1.=8 Q; Vs: ;r 16 V; Pa=l4.6 W; Ta: 65 °C). Note that the metal tab on the chip package is internally connected to pin 5. The accompanying photograph shows that this high quality stereo amplifier has a very low component count, and is readily constructed on a piece of Veroboard. The following technical data are stated as typical in the data- sheets for the TDAl52l   

Distortion at Pa: 12 W:
0.5%
Quiescent current:
40 mA
Gain balance:
0.2 dB
Supply ripple rejection:
60 dB
Channel separation:
70 dB
Output offset voltage:
20 mV
3 dB power bandwidth:
20-20,000 Hz