Deferential PWM Audio Signal Audio Amplifier for Voice Record/Playback, Music, and Sound Effects IC Using LM386

Lots of Voice Record playback, music and sound effects IC provide PWM signal output to drive small speaker which is usually low signal just can drive small speaker.  Boosting this signal required special audio amplifier which amplify the deferential PWM signal.  This amplifier is solution and help to amplify PWM +/- dual signal, the amplifier is based on LM386 IC.

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Tone Control Circuit Using NE531 Op-Amp

Tone control of audio system involves altering the flat response in order to attain more low frequencies or more high ones, dependent upon listener preference. the circuit provides 20dB of bass or treble boost or cut as set by the variable resistance. Op-Amp NE531 or 301,Turn Over Frequency 1Khz,Base Boost +20dB , base cut -20dB , Treble boost +19dB at

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Phantom-Powered Professional Microphone Pre-Amplifier Circuit Using INA217

The Circuit is based on INA217 from Texas Instruments and the IC used in professional audio equipment such as professional microphone preamps, moving-coil transducer amplifiers, differential receivers, and bridge amplifiers.   Features 48V Phantom Powered, Remotely Located Microphone Circuit Operates from +/-15V Power Supply Low Distortion and Noise Over The Audio Frequency Band Gain Range from To 20db To 60

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Hi-End Microphone Pre-Amplifier With Pantom Power Input

Go from either dynamic condenser or electret microphone to line-level with a minimum of noise, distortion and hassle.  Balance Microphone preamplifier is ultra clean one channel preamplifier, intended for use in most critical digital analog recording situations.  The circuit delivers exceptional sonic performance even with extremely high input levels, making it ideal mate to the latest generation of transformer less

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