Showing posts with label mixer. Show all posts
Showing posts with label mixer. Show all posts
Friday, 10 February 2017
3 channel audio mixer
3 channel audio mixer is built using some of the transistor amplifier.
3 channel audio mixer circuit uses voltage 9VDC summber which can supplied from a battery. 3 channel audio mixer circuit is designed special for the purposes of this Public Amplifier.
Because the audio circuit of this mixer is designed specifically for the purpose of a portable mixer for audio public then this series has only a volume control without the tone control. Image series that looks below audio mixer is a series of mono, if you want to make a 3 channel stereo audio mixer it is necessary to make 2 pieces of a series of three channel audio mixer terebut. For more details, a series of three channel audio mixer can be seen in the following image.
3 channel audio mixer circuit uses voltage 9VDC summber which can supplied from a battery. 3 channel audio mixer circuit is designed special for the purposes of this Public Amplifier.
Because the audio circuit of this mixer is designed specifically for the purpose of a portable mixer for audio public then this series has only a volume control without the tone control. Image series that looks below audio mixer is a series of mono, if you want to make a 3 channel stereo audio mixer it is necessary to make 2 pieces of a series of three channel audio mixer terebut. For more details, a series of three channel audio mixer can be seen in the following image.
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| 3 channel audio mixer circuit |
Sign Component Audio Mixer With 3 Chanel Transistor
P1, P2, P3 = 5K
R1, R11, R15 = 180K
R2, R12, R16 = 2M2
R3, R13, R17 = 750R
R4, R14, R18 = 1K
R5 = 15K
R6 = 220R
R7 = 1.5K
R8 = 820R
R9 = 150R
R10 = 100K
C1, C6, C8 = 1μF-63V
C2, C4, C7, C9 = 100μF-25V
C3, C5 = 220μF-25V
Q1, Q4, Q5 = BC550C
Q2 = BC547 should
Q3 = BC557
J1, J2, J3 = 3mm Mono sockets
SW1, 2,3,4 = SPST Toggle
In a series of three channel audio mixer is equipped with a switch on each chanelnya which select the input impedance, when the switch SW1, SW2 and SW3 in the open then the input should come from the output signal with a high level such as VCD, MP3 player, tape, computer and tuner . And at SW1, SW2 and SW3 closed position, the input should come from a weak audio signals such as microphones.
Saturday, 26 November 2016
Audio Mixer
General Description:
A new audio mixer circuit uses an LM3900 IC but is not a profesional audio dj mixer. The IC houses four integrated Norton amplifiers. The advantage of using the four op amps is that they only need a single power supply. Since this amplifier circuit is current controlled, the DC bias is dependent on the feedback coupling.The schematic diagram shows inverting AC-Norton amplifiers. The DC output must be set at 50 percent of the power supply. In this case, a maximum output can be achieved without distortion (also called symmetrical limitation through overdrive).In designing this mini audio mixer circuit diagram you can freely choose the value of the resistor R2 (100k in the mixer schematic). Set the AC voltage amplification factor through the ration of R2/R1. To set the amplifier gain correctly, choose the value of R4=2R2 (double the value of R2).Diagram 1.0 shows the 3-channel sound mixer circuit using three Norton-opamps. The input levels can be set by potentiometers P1 or P3. Furthermore, each input level can be trimmed with the help of trimmers pots P4 to P6 to adapt each input to the source. The resistors at the non-inverting inputs of the opamps work as DC bias and set the DC output at 50 percent of the power supply for this powered audio mixer. All three input signals are summed by the fourth opamp A4 through the resistors R3, R7 and R11. The commom volume level is cotrolled through the potentiometer P7. You can switch an input channel on or off through the switches S1 and S3. An input channel is turned off when its switch is closed. It is also possible to replace these mechanical switches with transistor gates. By doing so, you can build an analog multiplexer circuit that can be easily expanded by several inputs.
Circuit Diagram and PCB:
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| Audio Mixer Circuit Diagam |
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| Audio Mixer Circuit digram |
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| Audio Mixer layout |
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| PCB Audio Mixer |
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