Just a short update.
Turned out that some of the relays that i use from Fujitsu is not in stock. So instead of have some boards populated with fujitsu and some with omron. We ordered Omron friday for them all. The arrive tomorrow.
Model number : G6K-2FY 5DC
They are SMT. So we want to populate them in 1 run.
The Preamp uses the exact same firmware as previous board. So no need of work here.
- Sonny
Turned out that some of the relays that i use from Fujitsu is not in stock. So instead of have some boards populated with fujitsu and some with omron. We ordered Omron friday for them all. The arrive tomorrow.
Model number : G6K-2FY 5DC
They are SMT. So we want to populate them in 1 run.
The Preamp uses the exact same firmware as previous board. So no need of work here.
- Sonny
Hi Sonny
Thank you for you private messages!
I wish you all the best and I hope to get the promised goods soon.
Best regards, Joel
Thank you for you private messages!
I wish you all the best and I hope to get the promised goods soon.
Best regards, Joel
Sonnya...
Safari is still blocking your website here in the UK. (Reported as harmful...suspect that a certain gentleman made that report)
Safari is still blocking your website here in the UK. (Reported as harmful...suspect that a certain gentleman made that report)
Distortion and cross talk is good...
I would recommend a wall between psu and preamp board... To get maximum out of the noise floor.
Dropbox link instead with high resolution images
Dropbox - preamp v1.1 6V 1k gain -7dB.bmp - Simplify your life
Dropbox - preamp v1.1 6V 5k gain -7dB.bmp - Simplify your life
Dropbox - preamp v1.1 6V 10k gain -7dB.bmp - Simplify your life
Dropbox - preamp v1.1 6V 1k gain -7dB cross talk.bmp - Simplify your life
Dropbox - preamp v1.1 6V 10k gain -7dB cross talk.bmp - Simplify your life
Crosstalk is -109dB at 1KHz.
I would recommend a wall between psu and preamp board... To get maximum out of the noise floor.
Dropbox link instead with high resolution images
Dropbox - preamp v1.1 6V 1k gain -7dB.bmp - Simplify your life
Dropbox - preamp v1.1 6V 5k gain -7dB.bmp - Simplify your life
Dropbox - preamp v1.1 6V 10k gain -7dB.bmp - Simplify your life
Dropbox - preamp v1.1 6V 1k gain -7dB cross talk.bmp - Simplify your life
Dropbox - preamp v1.1 6V 10k gain -7dB cross talk.bmp - Simplify your life
Crosstalk is -109dB at 1KHz.
Attachments
Last edited:
@sonnya accepting any more orders for the pre-amp at this stage?
Yes we do.
The motherboard could also be ordered without modules. And people can insert modules like Sparkolabs SS2590... Only limit is size... No more than 28mm width.
Only thing i do not know how other modules perform. But i would choose something with JFET or Mosfet input.... Speaking mosfet.... More to come if the behave like i want them to.
- Sonny
Nice.. may I ask, what is driving the pre..? 🙂
Right now it is a RTX 6001 audio analyzer. But the AK4493 DAC would do it just as well.
If things turns out like i want it to. I will use this preamp in the SB acoustic booth in Munich.
- Sonny
Yes we do.
The motherboard could also be ordered without modules. And people can insert modules like Sparkolabs SS2590... Only limit is size... No more than 28mm width.
Only thing i do not know how other modules perform. But i would choose something with JFET or Mosfet input.... Speaking mosfet.... More to come if the behave like i want them to.
- Sonny
You should have an email asking for price of preamp board, gain modules and a chassis if you have one spare. Will be using SilentSwitcher with this.
Hi Sonny
I have send you an email yesterday
I think i have replied you.
If not then please send it again.
- Sonny
I got a few emails
..
I am on my way to munich. I will find time answer them tomorrow....
In the mean time, dac and preamp is connected together using oled display.
There is two firmware package for the DAC. Which both runs.
1) simple 7 segment
2) oled display connected to the DAC using 10 way ribbon cable and i2c bus as interface. It is a polling function where the oled display updates 4 times per second.
We will do a third version which is a variant of the simple display. With a few led and a couple of button. Just to keep it simple...
..
I am on my way to munich. I will find time answer them tomorrow....
In the mean time, dac and preamp is connected together using oled display.
There is two firmware package for the DAC. Which both runs.
1) simple 7 segment
2) oled display connected to the DAC using 10 way ribbon cable and i2c bus as interface. It is a polling function where the oled display updates 4 times per second.
We will do a third version which is a variant of the simple display. With a few led and a couple of button. Just to keep it simple...
The interfaces present for audio sources is:
SPDIF – RCA (up to 192KHz/24Bit)
SPDIF – Optical (Up to 96KHz/24Bit)
I2S – 3.3V CMOS level (Up to 192KHZ/24Bit)
SPDIF and I2S runs through an SRC4392 sample rate converter where the signal is converted to 192KHz/24Bit. It is to lower Jitter and at the same time the combination of good SPDIF receivers and a good Samplerate converter is difficult to get at a better value and space.
Oscillators:
The oscillators used can be low cost FOX as is in the V1.0 DAC or it can be the expensive and very low phase noise Crystek CCHD-957 oscillators. (There is one crystal oscillator that is not possible to change but it is used as a reference for the SPDIF input to detect the sample frequency)
USB:
USB is galvanic isolated now. We use a DC/DC converter from Murata, but it can be feed with an external +5V source that is isolated. J11 is the input for that voltage. J13 is a control signal for an external source if you want’s to turn it off. Data rates is still the same as for the version 1.0 -> 384KHz/32Bit and DoP 128/DSD 256.
If refer to above, is that mean if I got i2s source from a rpi transport + spdif/i2s HAT, the highest freq I can play is 192KHZ/24Bit but not usb rate of 384KHz/32Bit and DoP 128/DSD 256?
I believe the Pi i2s can only do PCM up to 192/24 and DoP to 128, no native DSD support for the Pi
In that case I also have got one Singxer F1 usb interface which can output spdif and i2s. i2s output can go all the way up to DSD256. Is it doable to use Singxer F1 with audio pc to output i2s to the dac and play DSD256?
- Home
- Vendor's Bazaar
- AK4490 USB Dac with dsd support.