mono audio mixer, equaliser, vu meter, crossover, PCB
Required skills: Electrical Engineering, Electronics, PCB Layout
Hello
PLEASE READ:
BY BIDDING YOU AGREE I WON`T ACCEPT TO PAY FOR PARTIAL WORK, JUST FULL AS I WANT, ALL STATED BELLOW.
I REQUIRE ENGINEER TO COMMUNICATE ON SKYPE AT LEAST EVERY 2DAYS.
I need to create schematics and pcb layout files of audio devices
All of these are working on non - symetricall power supply of 10-16,5-18V{battery powered}, they have to work on such voltage levels
As this is battery powered, voltage varies from 18 to 10V, still there is dc -dc converter that is used all the time for power amplifier, so you can use power from this one
Things that have to be created>
1. mono mixer board with adjustable 5 inputs, one master pot
all 5 have regulation of bass, treble +-15db
These 4 are balanced, able to accept unbalanced signal as well,
1 is unbalanced, used for receiving RF signal from audio receiver module, as this module is stereo there is need to create balancing pot to decide which channel would be received
2 of these 4 inputs are microphone/guitar. They have switchable impedance so they are absolutely universal, they are also switchable to provide phantom power for certain microphones.
When signal traveles from master pot, it passes throught
2. subsonic filter, 36db cut, adjustable from 20 to 60hz
then it reaches
3. constant-q topology based equaliser, possible to be turned off
{this board has maximum limits of 160mm long and 100 wide}
this is module that is separated from mixer itself
11band
40, 50, 63,80,100, 200, 500, 1000, 2000, 4000 , 16000hz
signal is then parraleled between
4.line out outputs, able to provide balanced and unbalanced output
5. RF transmitter module input, with L-R balance pot for transmitting overall signal which would be determined by master pot, when monitored with vu it should be matched so according to vu display you would know if signal is clipping or not for transmitter
6. 10 led vu meters
one would monitor crossover input
second meter monitors line out output, this should be matched to determine if any of musical signals are clipping according to standards from -20 to +3db
7. 2way active crossover board made by linkwitz riley topology, set at 2khz/24db slope
this signal would then be divided between bass/middle and middle/treble section which would supply amplifier with input signal
8. Board has also battery monitor circuit that measures battery level with 10diodes, from 11 - 16,5V
when battery voltage reaches 18V, other diode would be lighten up
Mixer and other devices board should not exceed 145mm lenght and 300mm width
as this device works on batteries, it has its bms which in case voltage drops bellow 10V needs to disconnect battery from load, via say relay{but i would prefer transistor}
It is charged by 19,5V / 6,7A adaptor{provided by me}
Amplifier itself is working on 32V signle supply which would be provided by dc dc converter{provided by me}
This requires capacitor compensation, on in and out of this dc dc converter
When system is started up, amplifier{speakers or amplifier itself should be connected with delay} and all signal outputs should be connected delayed or bypassed first
When adaptor is connected, providing 19,5V, batteries are disconnected from outer system
Batteries are being charged, outer system is being powered ,both supplied by this adaptor. At time when 19,5V of external power are present, no connection between batteries and outer system is made.
When there is no external supply, batteries are automatically connected to the outer system.
PLEASE READ:
BY BIDDING YOU AGREE I WON`T ACCEPT TO PAY FOR PARTIAL WORK, JUST FULL AS I WANT, ALL STATED BELLOW.
I REQUIRE ENGINEER TO COMMUNICATE ON SKYPE AT LEAST EVERY 2DAYS.
I need to create schematics and pcb layout files of audio devices
All of these are working on non - symetricall power supply of 10-16,5-18V{battery powered}, they have to work on such voltage levels
As this is battery powered, voltage varies from 18 to 10V, still there is dc -dc converter that is used all the time for power amplifier, so you can use power from this one
Things that have to be created>
1. mono mixer board with adjustable 5 inputs, one master pot
all 5 have regulation of bass, treble +-15db
These 4 are balanced, able to accept unbalanced signal as well,
1 is unbalanced, used for receiving RF signal from audio receiver module, as this module is stereo there is need to create balancing pot to decide which channel would be received
2 of these 4 inputs are microphone/guitar. They have switchable impedance so they are absolutely universal, they are also switchable to provide phantom power for certain microphones.
When signal traveles from master pot, it passes throught
2. subsonic filter, 36db cut, adjustable from 20 to 60hz
then it reaches
3. constant-q topology based equaliser, possible to be turned off
{this board has maximum limits of 160mm long and 100 wide}
this is module that is separated from mixer itself
11band
40, 50, 63,80,100, 200, 500, 1000, 2000, 4000 , 16000hz
signal is then parraleled between
4.line out outputs, able to provide balanced and unbalanced output
5. RF transmitter module input, with L-R balance pot for transmitting overall signal which would be determined by master pot, when monitored with vu it should be matched so according to vu display you would know if signal is clipping or not for transmitter
6. 10 led vu meters
one would monitor crossover input
second meter monitors line out output, this should be matched to determine if any of musical signals are clipping according to standards from -20 to +3db
7. 2way active crossover board made by linkwitz riley topology, set at 2khz/24db slope
this signal would then be divided between bass/middle and middle/treble section which would supply amplifier with input signal
8. Board has also battery monitor circuit that measures battery level with 10diodes, from 11 - 16,5V
when battery voltage reaches 18V, other diode would be lighten up
Mixer and other devices board should not exceed 145mm lenght and 300mm width
as this device works on batteries, it has its bms which in case voltage drops bellow 10V needs to disconnect battery from load, via say relay{but i would prefer transistor}
It is charged by 19,5V / 6,7A adaptor{provided by me}
Amplifier itself is working on 32V signle supply which would be provided by dc dc converter{provided by me}
This requires capacitor compensation, on in and out of this dc dc converter
When system is started up, amplifier{speakers or amplifier itself should be connected with delay} and all signal outputs should be connected delayed or bypassed first
When adaptor is connected, providing 19,5V, batteries are disconnected from outer system
Batteries are being charged, outer system is being powered ,both supplied by this adaptor. At time when 19,5V of external power are present, no connection between batteries and outer system is made.
When there is no external supply, batteries are automatically connected to the outer system.
Posted In:Electrical EngineeringElectronicsPCB Layout |
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