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.
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)
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