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Audio amplifier input filters - Nathalie Beimler
https://nathaliebeimler.com/tech/audio_amplifier_input_filter.html
Abstract. Every audio amplifier needs an input filter to keep unwanted frequencies away. Both DC and too high frequency are undesirable to feed into the amplification. Blocking DC is trivial: Just use a large high quality capacitor for blocking DC and controlling low frequency roll-off and the problem is solved.
Audio Filters: Designing an audio equalizer – Part 7
https://www.engineersgarage.com/audio-filters-designing-an-audio-equalizer-7-8/
Audio Filters: Understanding the filters - Part 5
https://www.engineersgarage.com/audio-filters-basics-of-audio-filters-5-8/
Audio-Amplifier-circuit-with-noise-filtering | Mini ...
https://www.electronics-tutorial.net/Mini-Projects/Audio-Amplifier-circuit-with-noise-filtering/
This audio noise filter circuit is a bandpass filter for audio frequency band. It filters unwanted signals that are lower or higher than the audio frequencies. It has 2 filters: a low pass filter and a high pass filter in a cascade configuration. Practically in microphones, speakers, loudspeaker or audio systems we have audio amplifiers.
Audio Amplifier Circuit
https://web.ece.ucsb.edu/Faculty/rodwell/Classes/ece2c/labs/Lab%201a%20-%202C%202007.pdf
Audio Amplifier Circuit Overview In the first part of lab#1 you will construct a low-power audio amplifier/speaker driver based on the LM386 IC from National Semiconductor. The audio amplifier will be a self- ... Use of diode limiters/clamps …
power supply - Input filter for class d amplifier ...
https://electronics.stackexchange.com/questions/257212/input-filter-for-class-d-amplifier
I have built a ~50W class d amplifier powered by a 12V SMPS. My problem is that the output of the SMPS has high frequency noise. I know that the noise is not audible but I would like to remove all of it, so I decided to put an input filter between the SMPS and the amplifier. To build the input filter I made a search and found these two options:
Input Capacitors for Headphone Amps
https://tangentsoft.net/audio/input-cap.html
RC Filter Weakness 1: Bass Roll-Off. Together with the input impedance of the amp (R), the input cap (C) forms what is called a high-pass RC filter. “High-pass” means that it passes high frequency signals without attenuation; as the frequency gets lower, attenuation increases. In the amplifiers that I talk about on this site, R is R2.
Power supply decoupling & audio signal filtering for …
https://www.ti.com/lit/an/slyt199/slyt199.pdf
inverting and the inverting inputs of the amplifier. The input filters set the low frequency corner and block DC voltages and currents. Each filter consists of one external capacitor (C IN) in series with the fixed internal resistance (R IN) of the amplifier input. This creates a first-order high-pass filter (HPF) with a –3-dB corner frequency shown in Equation 5 of:
Elliott Sound Products - Audio Power Amplifier Design ...
https://sound-au.com/amp_design.htm
Input Current The input current of the first stage determines the input impedance of the amplifier. Using the above figures, with a collector current of 480µA, the base current will be 4.8µA for input devices with a gain of 100. If maximum power is developed with an input voltage of 1V, then the impedance is 208k ( R = V / I ).
Input capacitor | diyAudio
https://www.diyaudio.com/community/threads/input-capacitor.44659/
Your input filter is a high-pass filter with a capacitor (size as yet undetermined) and 11K resistance to ground. The corner frequency f0 is equal to 1/ (2pi*R*C), in Hz. If you wanted to pass frequencies higher than 20Hz, you could use a 1uF cap. If you used 2.2uF you'd pass everything higher than about 7Hz.
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