6 Channel Mixer Jean G. Occeus Jr. New England Institute of Technology EET 258
Transcript
1. 6 Channel Mixer Jean G. Occeus Jr.New England Institute of
Technology EET 258
2. Device Description This device is a 6 channel mixer designed
to combine three line inputs with three microphone inputs, and send
all the signals to one output. A 6 channel mixer is used in audio
production to combine various wave forms (guitar, drums, vocals,
etc.) and create an overall mix of the audio for recording and/or
live performances.
3. 2 Current Models Mackie DFX6- 6 channel mixer with effects
+48 v Phantom power for microphone connections inputs and outputs
Slider knobs and LED monitoring On board 32 bit digital effects
(Reverb, Flange, etc.) High and Low frequency equalization
Soundcraft EPM6 6-Channel Mixer 2 Auxiliary buses XLR and
microphone or line connections RCA jacks 3 band and 2 band
equalization Led monitoring 1 headphone output
4. 6 Channel Mixer 3 Mic Inputs/ 3 Line Inputs Block Diagram 6
Volume Controls 3 Microphone Amplifiers VOL 1 Main Mix AmplifierMIC
IN 1 1 Main Mix Volume Control VOL 1 Main OutputMIC IN 2 VOLMIC IN
3 VOLLINE IN 1 VOL VOLLINE IN 2 OUTPUT VOLLINE IN 3
5. 6 Channel MixerSchematic
6. Block / Schematic Reference Section 6 circles on the block
diagram are used to identify the inputs and outputs on the
schematic. Microphone inputs on the block diagram are associated
with a 10 microfarad capacitor and a 1 kilo-ohm resistor feeding
the amplifier section on the schematic. #1-#3 triangles on the
block diagram are associated with the LM741 microphone amplifiers
on the schematic. VOL rectangles on the block diagram are
associated with the 10 Kilo-ohm volume control potentiometers on
the schematic. #4 triangle on the block diagram are associated with
the Master Mix amplifier on the schematic. Dual 9V power supplies
are used on the schematic, but are not referred to on the block
diagram.
7. Simulation and Results 4 channel oscilloscope Channel A Sine
Wave Channel B Triangle Wave
8. Simulation and Results 4 channel oscilloscope Channel A Sine
Wave Channel B Triangle Wave
9. Simulation and Results Bode Plotter Output = Band-pass
Waveform Frequency Cutoff= 25.009 Hz
10. Simulation and Results Bode Plotter Output= Band-pass
Waveform Frequency cutoff @ 141.8 Khz
11. Simulation and Results Oscilloscope Sine wave showing
volume control and clipping
12. Simulation and Results Oscilloscope mixer output Sine Wave
showing peak to peak voltages
13. Simulation and Results Multisim Simulation Schematic 1
Function Generator producing a 1 Khz Sine wave 1 Function Generator
producing a 1Khz Triangle wave 1 Oscilloscope monitoring the
amplifier outputs 1 Oscilloscope monitoring the Master Mix
amplifier output.
14. PCB Layout The 6 channel mixing board was laid out to make
the inputs and outputs accessible. The design is intended to
resemble the layout of the schematic.
15. PCB Layout 3D model of the overall layout of the 6 channel
mixing board.
19. Pricing of Mixer1. 1 mixer would cost $325.00 for one day
shipping.2. 1000 mixers would cost $4.61 each for one day
shipping.
20. 6 Channel Mixer Video 1 Microphone connected to input
channel 1. 1 radio connected to input channel 2. The out of the
mixer is connected to the LM386 amplifier feeding an 8 ohm speaker.
Voice and Music are mixed together at the output.
21. Retrospective The 6 channel mixing board was designed to
mix 6inputs through one output using an operational amplifier.
Theproblem with this design is its inability to adjust the volume
ofthe mixers output. Future modification to the printed circuit
board wouldincluding volume control for the output, and a LED
display forvisual monitoring of the overall signal.
22. Closing Slide In closing, I would like tothank New England
Instituteof Technology for educatingme, and helping me see
theimportance of engineering inthe everyday world. A special thanks
toprofessor Recorvitz for hispatience and dedication to
theelectronics engineeringprogram here at NEIT. Albert Einsteins
quote:Education is what remainsafter one has forgotteneverything he
has learned inschool.