LA3161 is an integrated 2 channel pre-amplifier intended for car stereo applications. The LA3161 has a integrated voltage regulator Which plays an excellent role in improving ripple rejection . The IC requires minimum number of external parts and the noise level is quite low. The IC has high input impedance (around 100K) and is also available in an 8 pin SIL package.
In the circuit both of the integrated amplifier section are used. Capacitors C8 and C9 are input coupling capacitors. Capacitors C3 & C6 are noise filter capacitors. The lower cut-off frequency depends upon the value of C3 and C6 network comprising of components R1, R2 & C1 defines the frequency characteristics of left channel and the network consisting of R3, R4 &C2 defines the frequency characteristics of the proper channel. C4 and C5 are output coupling capacitors. C7 is the power supply filter capacitor and it need to be connected as close as possible to the power input pin (pin 4) of the IC. This IC doesn’t have short circuit protection, and short between pins may possibly cause damage. C10 and C11 are meant for preventing radio interference, interference from engines etc.
In the circuit both of the integrated amplifier section are used. Capacitors C8 and C9 are input coupling capacitors. Capacitors C3 & C6 are noise filter capacitors. The lower cut-off frequency depends upon the value of C3 and C6 network comprising of components R1, R2 & C1 defines the frequency characteristics of left channel and the network consisting of R3, R4 &C2 defines the frequency characteristics of the proper channel. C4 and C5 are output coupling capacitors. C7 is the power supply filter capacitor and it need to be connected as close as possible to the power input pin (pin 4) of the IC. This IC doesn’t have short circuit protection, and short between pins may possibly cause damage. C10 and C11 are meant for preventing radio interference, interference from engines etc.
