???
4490 mono mode is triggered using mono bit and sellr bit in a software command. Is the optional Jlsounds lcd controller able to trigger mono mode on 2 separate 4490 boards to achieve a dual mono configuration as done in Hummingbird with 4495s?
They are not compatible with LME49710 and the PCB shows Power on pin 7 so that is not going to work for LME49724.
The LME49724 looks like a very nice device tho.
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Hi,
Sorry for my late answer, lately the time is not enough
) and there is 2V RMS on the output and its' mute is good enough. The LME49710 board works form +-12V to +-15V.
Regarding for AK4495 I'll open a new thread.
Sorry for my late answer, lately the time is not enough
If the firmware version of the XMOS board is greater than 3.06 - yes.
For now there is not such an option.
Yes, you can switch just the DACs, no problem at all. Depending from your version of XMOS firmware, there might be some clicks. The necessary power supply for the AK4490 is one 5V, my recommendation is one to use clean external power supply.
That’s correct. Soon Lyuben will post scheme of the board. Without this board the DAC will work only with service settings.
The AK4490 DAC has differential outputs and LME49710 board and DRV603 board make the differential outputs to single ended and of course the reconstruct filters. On the AK4396 board the Opamps and the reconstruct filter were on the same board, but there ware plenty of diyers who remove the OpAmps and use directly the outputs of the DAC, that's why I decided the filters to be on separate boards. DRV603 is lower class than the LME49710, but it manages good with 5V PSU (it's the maximum
) and there is 2V RMS on the output and its' mute is good enough. The LME49710 board works form +-12V to +-15V.The USB part is little hungry 330mA, I recommend 4V – 4.3V in order the board to be cooler, as for the DAC and oscillators 5.1V 120mA.
Later today I’ll open a new thread about the Hummingbird dual ak4495 DAC with all detailed information.
It's not right I to make the comparison, I can only tell that the dual mono has its' advantages
On the AK4490 board the outputs are directly from the modulators from the DAC chip and they are balanced.
Regarding for AK4495 I'll open a new thread.
On the AK4490 board - right now, without interventions on the board
Sorry about that, you can always contact by mail, where Lyuben is faster than me
Where can I see firmware version..
Is there some option for change and flashing new XMOS firmware..
Hi,
Regarding the update - there are three scenarios:
1. Using a SPI programmer like this one: 24 25 Series EEPROM Flash BIOS USB Programmer CH341A with Software Driver | eBay
2. I can send you a new memory IC.
3. Slowest and expensive scenario - you can send me the board for update.
Regards,
Joro
I'll test this firmware for clicks with the AK4490.
Regarding the update - there are three scenarios:
1. Using a SPI programmer like this one: 24 25 Series EEPROM Flash BIOS USB Programmer CH341A with Software Driver | eBay
2. I can send you a new memory IC.
3. Slowest and expensive scenario - you can send me the board for update.
Regards,
Joro
For AK4490 I will certainly take another XMOS board..
This one with old firmware stays with AK4396 board.. v1.58 have some clicks..
I will choose first option only if it is 'idiotproof'.. second one also looks fine..
http://jlsounds.com/uploads/AK4490_board.pdf
http://jlsounds.com/uploads/LME_board.pdf
http://jlsounds.com/uploads/DRV_board.pdf
LCD control board still missing..
http://jlsounds.com/uploads/LME_board.pdf
http://jlsounds.com/uploads/DRV_board.pdf
LCD control board still missing..
Hi,
On the XMOS board there are three 3.3V LDO LP5900, one 1.8V LDO MCP1700T-1802E/TT and one 1V LDO MCP1825T distributed as follow: one LP5900, one 1.8V MCP1700T and one 1V MCP1825T are before the galvanic isolator (i.e. USB part) and two LP5900 are on the clean side for reclock and the oscillators.
The LP5900 doesn’t like voltage above 5.5V and that’s why one needs to use pre-regulator on 5V. Between those two, the LM317 in mode with capacitor between adj and gnd pins is far better.
Regards,
Joro
On the XMOS board there are three 3.3V LDO LP5900, one 1.8V LDO MCP1700T-1802E/TT and one 1V LDO MCP1825T distributed as follow: one LP5900, one 1.8V MCP1700T and one 1V MCP1825T are before the galvanic isolator (i.e. USB part) and two LP5900 are on the clean side for reclock and the oscillators.
The LP5900 doesn’t like voltage above 5.5V and that’s why one needs to use pre-regulator on 5V. Between those two, the LM317 in mode with capacitor between adj and gnd pins is far better.
Regards,
Joro
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