Dual DC Operated Tone/Volume/Balance Circuit with
National 3-D Sound
The LM4610 is a DC controlled tone (bass/treble), volume
and balance circuit for stereo applications in car radio, TV
and audio systems. It also features National’s 3D-Sound Circuitry
which can be externally adjusted via a simple RC Network.
An additional control input allows loudness compensation
to be simply effected.
Four control inputs provide control of the bass, treble, balance
and volume functions through application of DC voltages
from a remote control system or, alternatively, from four
potentiometers which may be biased from a zener regulated
supply provided on the circuit.
Each tone response is defined by a single capacitor chosen
to give the desired characteristic.
n National 3-D Sound
n Wide supply voltage range, 9V to 16V
n Large volume control range, 75 dB typical
n Tone control, ±15 dB typical
n Channel separation, 75 dB typical
n Low distortion, 0.06% typical for an input level of 0.3
n High signal to noise, 80 dB typical for an input level of
n Few external components required