As said, this doesn't change anything about the 100ohm output. Still wouldn't do it.FWIW: Khadas sells this optional adapter cable for an additional cost.
Connect your Tone Board's RCA stereo output to a 3.5mm compatible set of speakers or headphones.
Compatibility:
RCA to 3.5mm cable
- Khadas Tone Board
- Audio Equipment w/ RCA Output
- Headphones or Speakers with 3.5mm Male Audio-Jack
Hi,
I connected the J3 FPC 30PIN to ESS Controller from Ian from diyaudio.com,
and now I can control any registers of ES9038Q2M.View attachment 34763
Very cool. Thanks for sharing.
From page 6, it looks like only 6 "signals" are used.
- GND
- I2C DA
- 5V
- SCK
- LRCK/D1
- I2C CL
Ian’s ESS controller user ’s guide
Looks like 10 wires (5 grounds) can be soldered to the 10 through hole mounts on the back of the controller/display and then soldered to a 30 Pin FPC to DIP breakout board. The ribbon cable then completes the connection between the controller/display and the KTBD.
Yes exactly.
You can connect to J3 10pin or to J1 40pin.
Have you noticed any anomalies using Ian's ESS Controller ?
Do all of the features/menu options/displays work with the KTBD ?
Did you diverge from the factory default settings/filter selections ?
...
Yes, but I didn't spend much time on it, I focused on launching and functional testing of all functions by connecting KTBD to a laptop.
Now I have to connect to a better source than a laptop, maybe I will have to add a separate power supply to KTBD. We'll see ...
I was wondering if the USB's 5VDC was enough to drive the DAC, ESS Controller and RCA outs by itself.
KTBD normally is power hungry (specification 5V/500mA). But with laptop work OK, but when connect to eg. Raspberry Pi I have often hangs. And now I must connect to KTBD external power 5V and maybe 1A. I will test...
My raspberry 4 with touchscreen and KTB runs without problems on Anker usb charger via good usb cable (amazon basics)
Will try on my RPi 3B+ and report backRaspberry 4 is a different USB design than eg. ver. 3B+. It is USB 3.0 (higher current) and separated USB Hub from LAN. And here everything can be OK.
KTBD normally is power hungry (specification 5V/500mA). But with laptop work OK, but when connect to eg. Raspberry Pi I have often hangs. And now I must connect to KTBD external power 5V and maybe 1A. I will test...
What hangs, the KTB or the Pi - when you experience these hangs are you able to SSH into the Pi - and are the hangs during playback ?
Do you see any under-voltage messages in the output when you type 'dmesg | grep voltage' ?
Wired or Wi-Fi connectivity ?
I have an ethernet connected Pi 3B with a hifiberry Digi+ Pro HAT that feeds the KTB power via the USB and the audio via coax. unplug the USB cable from the Pi when not in use, so the KTB is not powered up but the Pi is left on 7x24. I've not experienced any hangs in even extended listening sessions lasting 5 or 6 hours. For a short time I also ran using just the Pi 3B feeding the KTB audio and power via the USB cable and can't recall any hangs.
@milw50717 do you experience a loud thump when powering on or of the KTB that is connected to the running amp?