Chip KA157HP3

Designed for noise reduction systems when listening to audio tracks.

The IC includes: amplitude detector, frequency corrector,

control amplifier, minimum limiter, voltage controlled

resistor for the purpose of controlling the noise reduction threshold,

upper and lower cutoff frequency limiters, algebraic

adder, input voltage follower, reference voltage source

and stabilized currents, an operational amplifier of a controlled filter and

controlled resistors of the 1st and 2nd links of the main controlled

filter.