38035

The 38035 is a monolithic BICmos IC de- signed for use in stereo cassette player systems. The device includes two separate audio channels composed by low noise preamplifier, Dolby B noise reduction system and Audio Music Sensor. The dual preamplifier contains mute, metal/nor- mal facilities for amplification of low level signal in applications requiring very low noise perform- ances.

Each channel consists of two cascaded opera-tional amplifiers.

The first one, AMP1, has a fixed gain of 36dB, and allows magnetic heads connection directly to ground. The second one, AMP2, is a standard op- erational amplifier whose equalizing external components fix the frequency response.

The Audio Music Sensor circuit detects the inter- program space and then the starting point of mu- sical programs (the interprogram time and  pro- gram detection time are externally selectable). The device contains Dolby B decoder NR chains requiring very few external components and do not require coils.