Small Signal Amplifier (Pre-Amplifier) For Audio Signal


The Stereo small level audio signal amplifier has been developed to amplify the low level stereo audio signal, without changing other parameters of the waveform such as frequency and shape of the signal. This circuit  has been designed to amplify signals in the range of 20Hz to 20 kHz. Circuit amplify the low level signals from microphones, ultra-sonic transducer and other audio signal source. The project amplify low level signal and then provide sufficient voltage level to drive power audio amplifier. Gain of the amplifier can be change by onboard preset. Circuit has preset on output to set the audio signal level.


  • Power supply: 12 – 24 VDC @ 40 mA
  • Gain 50
  • Onboard PRESET to adjust Gain
  • On Board Preset on Output to set the audio level Level
  • Header connector for connecting of input and output
  • Terminal pins for connecting power supply input
  • Power-On LED indicator
  • PCB dimensions 47 mm x 58 mm
  • Four mounting holes of 3.2 mm eactch





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