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Electronics Schematics - N

Noise Reduction Filters Circuits

Circuit Reduces VCC Ripple in Audio Band - 01/18/96 EDN-Design Ideas: The circuit in Figure 1  reduces noise and ripple by at least 35 dB over the audio range of 100 Hz to 20 kHz. The circuit provides a clean source of 5V power for driving audio circuits in portable applications such as cellular phones and multimedia notebook computers. Most linear regulators reject noise only to about 100 Hz.

Digital Noise Reduction Techniques for Combo Ii - National Semiconductor Application Note  (app note)

Filtering PC Bus Power - ASCII format

GalaXY Noise Filter

Hum Bucking & Noise Reducing Electronics for Guitars

Noise Filtering & the ADT7461 - AN-699 Analog Devices Application Note

Noise Reduction Techniques for Combo Ii - National Semiconductor Application Note

Non Complementary Audio Noise Reduction System - National Semiconductor Application Note 09-Apr-1996 (app note)

Reducing Noise on Microcomputer Buses - National Semiconductor Application Note  (app note)

TB-02: Digital Noise Reduction Techniques for Combo Ii - National Semiconductor Application Note  (app note)

A Non-Complementary Audio Noise Reduction System - National Semiconductor Application Note  (app note)

AN-337: Reducing Noise on Microcomputer Buses - National Semiconductor Application Note  (app note)

AN-386: A Non-Complementary Audio Noise Reduction System - National Semiconductor Application Note  (app note)

AN-4148/ Audible Noise Reduction Techniques for FPS Applications - Fairchild Application Notes / (app note)

Audio Notch Filter - A variable notch filter with both high and low pass filters.  For audio frequencies 100Hz 10KHz

Burwen DNF1201Dynamic Noise Filter - Schematics and Lineup Instructions

Circuit Eliminates Hum from Pulsed Signal - 01/20/94 EDN-Design Ideas: The circuit eliminates hum from a periodic signal by a factor of as much as100:1. Fig2a shows an incoming signal that combines a periodic square wave and a much lower frequency hum. Suppose for simplicity sake that the hum is sinusoidal.


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