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Old 27th February 2011, 09:54 AM   #51
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Hi guys. We still need more advices that we will consider in the next design/production.
It's 2 channels per board and we can add extended board to run multi-channels.
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Old 27th February 2011, 11:04 AM   #52
maxw is offline maxw  United Kingdom
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Quote:
Originally Posted by hifimediy View Post
It's 2 channels per board and we can add extended board to run multi-channels.
Do you mean connecting multiple boards together via the SDI/SDO?
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Old 27th February 2011, 12:47 PM   #53
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Originally Posted by maxw View Post
Do you mean connecting multiple boards together via the SDI/SDO?
yes right. so each channels can change volume at same time.
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Old 28th February 2011, 08:07 PM   #54
alkasar is offline alkasar  France
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Quote:
Originally Posted by hifimediy View Post
Hi guys. We still need more advices that we will consider in the next design/production.
It's 2 channels per board and we can add extended board to run multi-channels.
Hello Hifimediy,
some food for thoughs:
- control signal to power on/off source when selected
- control signal that remains ON, whatever source is selected (to power an amp)
Controls should be strong enough to control relays.

- separate board for Pot alone, to give more flexibility for front panel layout

- IMHO, 3 inputs is sufficient and could result in smaller board.

- a VFD display ? 7 digit display is ok, but old fashion and very limited. LCD display is common but unreadable from 2m distance! VFD will be more expensive, but so much nicer.
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Old 17th March 2011, 02:50 PM   #55
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Quote:
Originally Posted by alkasar View Post
Hello Hifimediy,
some food for thoughs:
- control signal to power on/off source when selected
- control signal that remains ON, whatever source is selected (to power an amp)
Controls should be strong enough to control relays.

- separate board for Pot alone, to give more flexibility for front panel layout

- IMHO, 3 inputs is sufficient and could result in smaller board.

- a VFD display ? 7 digit display is ok, but old fashion and very limited. LCD display is common but unreadable from 2m distance! VFD will be more expensive, but so much nicer.
Good idea. thanks Al.
And I have done some update to new version. We have control port for relays which can be used to control the source. And we also add a signal for power amplifier (with an optional 1sec delay) . More details:
  • - Volume control using pga2310 chip (-87dB to +40dB).
  • - 4-channels input selection for different audio source.
  • - 3*7seg display and rotary encoder on a separate board.
  • - Rotary encoder used for volume control, input selector (short press), ON/Standby (long press).
  • - Infrared remote control.
  • - Remenber customer configuration((see function of sw1).
  • - Learnable remote function(see function of sw3).
  • - Extendable for multi-channel by adding one or more daughter boards.
  • - Display brigtness control (4 levels by remote key F3).
  • - Control port for external boards use, e.g. DAC, amplifier etc..
  • - 4X on-board switches for hardware configurations:
    sw1: on-auto save configuration when power off;
    off-default configuration when cold start
    sw2: on-display always on;
    off-display blank after about 5sec no action
    sw3: on-remote learning mode (operating sequence 000-ON/OFF, 111-MUTE, 222-Volume down, 333-Volume UP, 444-Channel down, 555-Channel up, repeat for another cycle.)
    off-normal mode
    sw4: on-Customer mode;
    off-Standard mode.
note: another way to enter Infrared remote learning mode, press the rotary encoder and power on, the display brightness adjustment can also be accessed then by pressing the rotary encoder.
  • - PCB size: 128*100mm

Last edited by hifimediy; 17th March 2011 at 02:53 PM.
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Old 27th June 2011, 04:22 PM   #56
alkasar is offline alkasar  France
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Hello Hifimediy,

If you ever work on a v2 of this board, you could improve speed of volume control; 1dB per step leads to a lot of rotation to significantly increase or decrease volume.

I would suggest to incr/decr by steps of 3dB if the knob is rotated fast and steps of 1dB if rotaded slowly. "Fast" and "slow" needs to be tuned.
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Old 3rd July 2011, 04:29 AM   #57
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Good and thanks.
This is the first version, I think we can improve with more functions next.
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Old 4th July 2011, 01:58 PM   #58
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I would like to get one of these, but am having trouble finding a transformer with dual secondaries, 12-0-12 and 6VAC. I have a wall wart with 9VAC - would that work for the 6V circuit? Would rather have one transformer do it all if possible.

Thanks in advance.
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Old 5th July 2011, 01:39 AM   #59
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Hi, yes, we recommend 9VAC now, because 12V relay is used on board. this power rail is used for digital part circuit also.
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Old 5th July 2011, 12:47 PM   #60
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So could I just use a 12-0-12 transformer for the analog circuit and then use one 12-0 leg for the digital part?
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