International Journal of Academic Engineering Research (IJAER)   Year: 2022 | Volume: 6 | Issue: 7 | Page No.: 13-16 Design and Implementation of the Kerwin - Huelsman - Newcomb (KHN) Biquad Filter for Very Low Frequency (VLF) Applications. Download PDF Atsuwe, B.A Abstract: The Kerwin- Huelsman- Newcomb (KHN) second-order Band pass filter was designed and simulated for implementation in the very low frequency (VLF) bands. Six (6) resistors, two (2) capacitors, three (3) op-amps of ľA741 type, connectors and NI multisim version 14.2 software was used for the design and simulation. Results show that the centre frequency (w_o) of 16.595 kHz which was slightly sifted was recorded. The mid-band gain recorded was 21.79db; the bandwidth recorded was 1.15 kHz and a roll-off rate that approached single-pole second order of -27.19db/decade with a little overshoot. It is then concluded that the KHN filter can be used for the implementation at very low frequency (VLF) applications. It can be recommended that further studies be carried out at other frequency bands in order to ascertain the functionality of the KHN filter at those frequency levels.