3 Channel Audio Mixer With Transistor

Monday, October 8th, 2018 - Audio Circuit

3 channel audio mixer circuit in the picture below was made using a voltage amplifier transistor composed of several levels. 3 channel audio mixer consists of 3 pieces mic pre-amp with a voltage amplifier transistor and Darlington transistor. To operate the 3 channel audio mixer circuit is required a DC voltage source + 9 volts that can be drawn from a battery or power supply. Here is a picture of circuits and components to make 3 channel audio mixer circuit in question.

The circuit of 3 Channel Audio Mixer With Transistors

3 Channel Audio Mixer With Transistor

Component List Of 3 Channel Audio Mixer With Transistor

  • P1 = 5K
  • P2 = 5K
  • P3 = 5K
  • R1 = 180K
  • R2 = 2M2
  • R3 = 750R
  • R4 = 1K
  • R5 = 15K
  • R6 = 220R
  • R7 = 1.5K
  • R8 = 820R
  • R9 = 150R
  • R10 = 100K
  • R11 = 180K
  • R12 = 2.2M
  • R13 = 750R
  • R14 = 1K
  • R15 = 180K
  • R16 = 2M2
  • R17 = 750R
  • R18 = 1K
  • C1 = 1µF-63V
  • C2 = 100µF-25V
  • C3 = 220µF-25V
  • C4 = 100µF-25V
  • C5 = 220µF-25V
  • C6 = 1µF-63V
  • C7 = 100µF-25V
  • C8 = 1µF-63V
  • C9 = 100µF-25V
  • Q1 = BC550C
  • Q2 = BC547
  • Q3 = BC557
  • Q4 = BC550C
  • Q5 = BC550C
  • B1 = 9V
  • J1,J2,J3 = 3mm Mono Jack
  • SW1,2,3,4 = SPST Toggle

At 3 channel audio mixer circuit with a transistor above basically consists of two main parts as follows.

Microphone Pre-Amplifier.

Section mic pre-amp functions as a voltage of the output microphone amplifier before it is mixed with other signals. Mic pre-amp circuit is built using a voltage amplifier of the type BC550C NPN transistor. Mic pre-amp is designed to amplify the output signal of a dynamic-type microphone. At each pre-amp mic circuit 3 channel audio mixer equipped with a regulator on the strengthening of the microphone signal using potentiometers and barrier strengthening the signal level using a switch for each chanel.

Voltage amplifier

Voltage amplifier circuit with Darlington transistor serves to amplify the signal from the mic pre-amp and as part mixing the signals from the mic pre-amp assigned to this voltage amplifier circuit. The voltage amplifier circuit constructed using an NPN transistor type BC547 and BC557 that are arranged in Darlington. In this section the signal from the mic pre-amp is mixed directly and given as input 3 channel audio mixer circuit with transistors.

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