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Booster Audio mixer circuit diagram using KA22242

DUAL EQUALIZER PRE-AMPLIFIER WITH ALC
The KA22242 is a monolithic integrated circuit consist-ing of a dual equalizer amplifier with ALC and Mute function, and it is suitable for stereo radio cassette tape recorders.

Booster Audio mixer circuit diagram using KA22242

APPLICATION INFORMATION DESCRIPTION OF KA22242
The KA22242 has a simple package, 10-pin and built-in ALC detector, mute circuit and ripple rejection filter developed for cassette tape recorders. To provide a stereo function, it has been developed into a 2-cannel pre-amplifier for recording and playback. Also to provide high speed dubbing and recording gain, its gain is high (f=1KHz, Gvo=85dB) and the total harmonic distortion is low (f=1KHz, THD=0.5%). An input circuit is used as a direct coupling system to eliminate the input coupling capacitor and prevent tape head magnetization and pop noise. a built-in ripple circuit (ripple rejection transistor) improves the ripple rejection ratio. And the ALC circuit can achieve a widw dynamic range by simply attaching a time-constant circuit.

FEATURES
Dual equalizer amplifier with ALC circuit.
Direct coupling system of input circuit.
High open loop voltage gain (Gvo=85dB at f=1KHz)
Wide operating supply voltage range (Vcc=4V~12V)
Low noise (V=1.0uV at Rg=2.2K ohm)
Ripple rejection filter.
High input impedance (R=62K ohm)