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4 Channel Selector with LCD, Push Buttons
4 Channel Selector with LCD, Push Buttons
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Old 9th February 2012, 11:14 AM   #1
suds is offline suds  India
Join Date: Feb 2006
Location: Bangalore
Default 4 Channel Selector with LCD, Push Buttons


I have made a 4 channel audio selector with Amplifier Power Switch using icro controller (89C51) there are three modules,

1.Controller module with connectors for front panel
2. Front Panel Module with LCD,Buttons, LED.
3. Audio Selector Board with relay, uses 4 pole relay to independently switch audio channels and ground (common ground return not used).

Controller module will have memory, last selected channel will be saved, next time when its switched on.
Additional feature Amplifier Power On/Off control using micro push button on panel (will drive 35A Relay).

Will post the schematic and images once work is completed.
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Old 16th February 2012, 09:43 AM   #2
suds is offline suds  India
Join Date: Feb 2006
Location: Bangalore
Posting completed PCB artwork, firmware will be ready on next 7 to 10 days
Modular circuits , it can be used in combination with other circuits.

Control Board (micro controller board)
Uses 89C51, heart of circuit has connector for push buttons, LCD, ports to connect other modules, Power supply on/of .

Front Panel
Push buttons and 3 led's connected to control board(third one connected to 5vdc)

4 channel Relay Board, 4 pole relay to switch Left,Right and ground.
Common return ground is not used, additional mute relay (used during power on/off , and channel change) separate ground connection from amp for mute.
Relay board can be used with other circuits also, 5VDC relay are driven by ULN2003

Prototype likely to be ready during first week of march.

PCB Gerber files will made available for download. (with out firmware)

Images Below:
Attached Images
File Type: png Control-Board-V2.png (30.7 KB, 135 views)
File Type: png CB-Front-panel.png (14.8 KB, 127 views)
File Type: png Relay-BoardV2.png (30.6 KB, 129 views)
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Old 22nd January 2013, 11:07 PM   #3
kingston85 is offline kingston85
diyAudio Member
Join Date: Jan 2013
can you post a photo of what the completed modules look like?
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