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Microphone Preamplifier With 2 Transistor

Thursday, January 9th, 2020 - Audio

Microphone preamplifier or often known as mic preamp can be made ​​with a simple microphone preamplifier circuit as follows. 2 microphone preamplifier circuit uses 2 transistors are PNP and NPN transitor amplifier. Front of the microphone amplifier or preamplifier microphone 2 transistor uses a system of dc negative feedback through R6 which serves to provide stability strengthening. Level output signal from the microphone preamplifier is controlled by potentiometer P1. Input signal that can be responded well by this microphone preamplifier is 0.2 – 200mV and 1V RMS output will result. Complete range of two transistor microphone preamplifier can be seen in the figure below.

Microphone preamplifier circuit two transistors

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Component List 2 Transistor Microphone preamplifier

  • P1 2k2
  • R1, R2, R3 100K 1/4W
  •  R4 8K2 1/4W
  • R5 68R 1/4W
  • R6 6K8 1/4W
  • R7, R8 1K 1/4W
  • R9 150R 1/4W
  • C1 1uF 63V
  • C2, C3, C4 100uF 25V
  • C5 22uF 25V
  • Q1 BC560C
  • Q2 BC550C

Microphone preamplifier circuit two transistors in the show above is preampmic suitable for home audio system on the stereo. This microphone preamplifier circuit requires supply voltages 9Vdc. In laying this preamic endeavored not close to sources of noise such as travo, and its wiring system because the two transistors premplifier microphone is very sensitive.

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