Microphone Preamplifier with BJT and Op Amp

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SPICE simulation of a low noise balanced microphone preamplifier, the input stage consists of differential pairs of transistors 2N4403 and BC549, a common mode gain control connects the emitters of the pairs. A differential operational amplifier implemented with a TL071 provides a balanced to unbalanced buffer because the circuit is differential in and out.

  • : Free
  • : Intermediate
  • : 20-100
  • : Micro-cap
  • : 10+
  • : No


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