Hi Aleksandrs,
no good idea!
You should enter Najda with the highest possible (non-clipping!) analogue volume to keep digital resolution high. Therefore a good digital crossover has an analogue volume control like Najda.
Even using external DACs (seems not necessary though), the signal should be re-entered into Najda to control volume this way.🙂
USB relay
I think all of the USB relays with the red PCB, blue relay and green screw terminals use the same software.
Single USB relay: Brand New USB Relay 1 Channel Programmable Computer Control for Smart Home | eBay
This seller has a link to a ”Datasheet Download” that includes the software: USBRelayExtLib
Dual USB relay: USB Relay 2 Channel Board Programmable PC Computer Control for Smart Home New | eBay
This seller has a link to webpage in Chinese: ttp://tinyurl.com/pddxnyr
The download button is just above the “thumbs up” icon near the top-middle part of the page. The icon is a down arrow pointing to an inverted bracket.
The software is not included with the relay in the shipment.
Windows recognizes the relay as a HID device and does not install a driver.
I am using the dual relay. The command to energize the relay is “open”.
I think all of the USB relays with the red PCB, blue relay and green screw terminals use the same software.
Single USB relay: Brand New USB Relay 1 Channel Programmable Computer Control for Smart Home | eBay
This seller has a link to a ”Datasheet Download” that includes the software: USBRelayExtLib
Dual USB relay: USB Relay 2 Channel Board Programmable PC Computer Control for Smart Home New | eBay
This seller has a link to webpage in Chinese: ttp://tinyurl.com/pddxnyr
The download button is just above the “thumbs up” icon near the top-middle part of the page. The icon is a down arrow pointing to an inverted bracket.
The software is not included with the relay in the shipment.
Windows recognizes the relay as a HID device and does not install a driver.
I am using the dual relay. The command to energize the relay is “open”.
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Thanks for your reply.
That is, I can not delete this chip in the signal path?
And if I'm going to take a signal directly from input CS3318 (in1, in2, ...)?
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Interesting
Is it a good idea to use this 3.3V for powering the Isolated I2s output on the WaveIO?
Hi Aleksandrs,
You took me wrong, I didn`t mean that You CAN`t avoid this chip, I wanted to point out that You SHOULD not do it!
If You regulate volume before entering Najda, only a fraction of the available bits will be used, if the volume is low.
Najda should be fed with as close as possible to 1V at the fixed normal analogue input to use full digital resolution.
But do as You want, maybe I don`t understand Your design goal...🙂
Hi 20m30! Sorry, I do not know your name.
Since AFTER the "Najda" in the amplifiers are analog volume controls on the relay, I would like to avoid unnecessary operational amplifiers that are on the CS3318.
I suppose you need to check that the dac output impedance and power amp impedance matches well, and that the dac can output high enough voltage levels for your amp.
I wouldnt bother with it though. Its nice to have a digitally controlled analogue volume control with additional gain if needed. 🙂
I wouldnt bother with it though. Its nice to have a digitally controlled analogue volume control with additional gain if needed. 🙂
These parameters are OK. I just want to avoid unnecessary opamp in CS3318.
This power supply is used for digital circuits only.
I don't think the wake-up problem is caused by the power supply. Are you running the latest firmware? (v.1.3)
The Najda was originally intended to be supplied with or without the CS3318. As the demand was nearly 100% for the board with that chip assembled, I gave up the idea of releasing a version without that chip.
As you have noticed, there are solder bridges near the CS3318. These bridges allow short-circuiting the chip and are to be closed when the CS3318 is not assembled. (For completeness, one should also close the IS_VOL\ bridge near the uC in order to have the DACs handling volume instead.)
In your case, shorting the bridges with the CS3318 in place and powered, that's probably not a good idea. You could try to remove the TH regulators near the chip, and that would result in not powering the chip. However this is experimental and I have never tried myself - the safest way is to remove the chip form the board.
There's another less intrusive way to achieve what you want: remove the TH coupling caps (22uF). One lead is connected to the OP output, the other lead goes to the CS3318. There are also AGND pads supplied on the PCB. From here, wire the signal to your amps.
Cheers
Nick
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If one would need remote volume on the najda, is it "good enough" SQ in itself or is separate dacs after najda better? Does anyone have links to last option (where builds are shown) if that is the best option?
Hi,
unfortunately nowbody has done a SQ comparison between Najda-DACs and other separate DACs after Najda. I am very happy with the Najda DACs and in many cases Najda outperformed other very expensive comparable systems.
Dahlberg has done a very fine build with Buffalo IIIs and valve outputs. But I think he didnt compare this build with the Najda DACs. Would have been very interesting!
Cheers
Sigi
I have built two "Najdas", one that I'm using in my own setup and one
that I built for a friend as a part of the speaker system that was the
main object.
I havn't compared them on the same speakers but I really liked the
finished result of the system (the speakers are simular to mine).
The new owner is more then satisfied with the end result and he's
not that easy to please so.....🙂
The analog output section/chip has some very neat functions with
gain settings as well, don't forget that.
I'm truly really satisfied with my own setup, it sounds fantastic
and I belive that it can be even more so. I have just finished the
main speakers so now they look great as well. Next project in line
are the subwoofers and after that I will most likely start finetuning
the dsp, mostly psu related. Have some 50hz humm on one of the
tube output buffers that needs some attention, and so on......
It will probably be a never ending project but isn't that the whole idea ? 😀
that I built for a friend as a part of the speaker system that was the
main object.
I havn't compared them on the same speakers but I really liked the
finished result of the system (the speakers are simular to mine).
The new owner is more then satisfied with the end result and he's
not that easy to please so.....🙂
The analog output section/chip has some very neat functions with
gain settings as well, don't forget that.
I'm truly really satisfied with my own setup, it sounds fantastic
and I belive that it can be even more so. I have just finished the
main speakers so now they look great as well. Next project in line
are the subwoofers and after that I will most likely start finetuning
the dsp, mostly psu related. Have some 50hz humm on one of the
tube output buffers that needs some attention, and so on......
It will probably be a never ending project but isn't that the whole idea ? 😀
I am in the process of buiding the Najda. Yesterday i soldered the expansion board and tonight i try to connect power and have a first try.
I will first compare Najda dac to my own Audio GB 19 dac (€700,- with 2 BB 1704 dacs).
No dsp settings just spdif in and analog out to compare the dacs. Will post the outcome when finished.
I will first compare Najda dac to my own Audio GB 19 dac (€700,- with 2 BB 1704 dacs).
No dsp settings just spdif in and analog out to compare the dacs. Will post the outcome when finished.
Alright. Can you please describe how you go into StandBy (remote or push-button) and how do you wake up your system?
Also, is that a permanent issue or does it happen once in awhile?
When this bridge is left open, volume is set by the CS3318 chip.
When the bridge is closed, volume is set by the DACs.
In your application, this bridge should be left open. Get the signals right after the OPs and adjust the volume on your amps. This way, any adjustment made by the CS3318 will not affect your setup.
I downloaded the NUC software in November and updated the firmware. NUC reports that V1.3 is installed. Should I download again?
I replaced a Meanwell power supply with the TDK MTW15. With the Meanwell supply I always used the standby button. Najda woke up most of the time after an overnight rest. About once a week it would not wake up and I had to cycle the mains power.
I installed the USB relay (remote) and MTW supply at the same time. I now use the relay exclusively to enter standby and wake. The relay is energized for about one second. It worked perfectly for about a week then one morning Najda did not wake. I tried using the standby button but that did not work (the relay was off). I had to cycle the mains power.
When the Meawell supply was installed the wake problem seemed (?) to be time dependent. The wake problem occurred more often if Najda remained in standby for more than one day. Lately I have been using it every day and have had only one issue.
I have the red board.
The power supply is not powering anything else when the board is in standby. Are Najda owners, that do not have standby problems, powering LEDs or some other device with 5V when their system is in standby?
Is the debounce implemented exactly like the other buttons?
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Hi Nick
I realise that recent discussion has focused on hardware issues. Can you give us an idea when you will be releasing the software with decimation capability?
Tx
I realise that recent discussion has focused on hardware issues. Can you give us an idea when you will be releasing the software with decimation capability?
Tx