K157HP3

Chips K157HP3 are dynamic noise reduction filters.
Designed for noise reduction systems when listening to audio tracks.
The IC includes: an amplitude detector, a frequency corrector, a control amplifier, a minimum limiter, a voltage-controlled resistor for the purpose of controlling the noise threshold, regulators-limiters of the upper and lower cutoff frequencies, an algebraic adder, an input voltage follower, a source of reference voltage and stabilized currents, an operational controlled filter amplifier and controlled resistors of the 1st and 2nd sections of the main controlled filter.
Contains 190 integral elements.
Case K157KhP3 type 2120.24-3, weight no more than 4 g.