Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Digital Line Level DACs, Digital Crossovers, Equalizers, etc.

Khadas Tone Board
Khadas Tone Board
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 1st March 2019, 12:26 PM   #1
Salar is offline Salar  Germany
diyAudio Member
 
Join Date: Feb 2006
Location: Germany
Default Khadas Tone Board

Hello to all,
any users of the Khadas Tone Board in this forum?
It measures very well and i own the standalone version of it,
which is called "Generic". Great sound!

Review and Measurements of WesionTEK Khadas Tone Board DAC | Audio Science Review (ASR) Forum

The "Generic" version is powerd by USB an receives the signal through SPDIF. No USB input.
The VIM Edition is controllable via PC and allows USB, SPDIF In/Out and much more.

I have one problem with the Generic version:

As far as I understand the description, alternate connecting should be possible via the 40-pin FPC socket.

Khadas Tone Board User Manual | Khadas Docs

I.e. pin 13 on the FPC socket receives SPDIF, and pins 1&2 receive 5V

But using a voltmeter I do not measure any physical connection
between the SPDIF Jack and FPC pin 13 or the USB-Voltage input and FPC pins 1&2.
Does anyone know why?

All the best,
Salar
  Reply With Quote
Old 1st March 2019, 04:35 PM   #2
Yatsushiro is offline Yatsushiro  France
diyAudio Member
 
Join Date: Mar 2016
Location: Normandie, France
Quote:
Originally Posted by Salar View Post
The "Generic" version is powerd by USB an receives the signal through SPDIF. No USB input.
The VIM Edition is controllable via PC and allows USB, SPDIF In/Out and much more.
You're a little bit out with your descriptions. Both Generic and VIM boards are electrically and electronically identical. The ONLY difference between the two is that the VIM edition has the pin headers already soldered in place ready for attachment to the VIM 1 or 2 Khadas SBC. If you solder the pin headers that you were supplied with with your Generic board you effectively have a VIM edition.

As such, both versions accept both USB (power and signal) and SPDIF input as supplied. It is only when attached to a VIM 1 or 2 that SPDIF output can be achieved.

Perhaps that is why your continuity tests do not give results that you expect, as it is the VIM SBC that 'completes' the circuit.

I do have one, initially connected to my RPi 3A+ via USB, and now powered via USB, but connected to an IQAudio Digi+ via SPDIF. I'm impressed so far...
  Reply With Quote
Old 1st March 2019, 05:21 PM   #3
Salar is offline Salar  Germany
diyAudio Member
 
Join Date: Feb 2006
Location: Germany
Hi, Thanks to your reply
To make a long story short:
I do use the board standalone right now. Power over USB,
SPDIF Signal over the SPDIF-Jack. No connection to a PC.

But now I want to use the FPC pin headers for voltage and SPDIF inputs.
But as I wrote there does not seem to be any physical connection to USB (Pins1/2 of FPC) or SPDIF (Pin13 of FPC)
when testing the pins with a voltmeter. That there is no physical connection to SPDIF might be logical
because of an electrical switch/logic triggered by the VIM
But the power lines should be physically connected, as there is
probably no "powerless" logic available yet to make the connection, right?

Reason why: I want to "upgrade" my CD-Players from the eighties
with this small board. But for proper casework inside the players
the USB Jack and SPDIF Jack are in the way

Last edited by Salar; 1st March 2019 at 05:34 PM.
  Reply With Quote
Old 2nd March 2019, 08:54 PM   #4
Salar is offline Salar  Germany
diyAudio Member
 
Join Date: Feb 2006
Location: Germany
Ok, looks like thing cannot being "beeped through" i.e as SPDIF
is pulled to GND when power is off. But Pins 1 & 2 of the 40pin connector are
connected, they receive +5V. Pin 21 is GND.
  Reply With Quote
Old 9th April 2019, 08:26 PM   #5
dabore84 is offline dabore84  Netherlands
diyAudio Member
 
dabore84's Avatar
 
Join Date: Dec 2016
Location: Hague area
Khadas Tone Board
I also purchased the khadas toneboard for my rig in the living room. I power it over usb and also use the spdif and my transport is a hifiberry digi + pro. I'm very impressed with the sound so far.



Connecting pin1 to +5V and pin21 to GND on the J1 header should work. pin13 is VIM_SPDIF and wont work. You could try the I2S pins in combination with your CD player.
  Reply With Quote
Old 10th April 2019, 01:52 PM   #6
ma_clanger is offline ma_clanger  United Kingdom
diyAudio Member
 
Join Date: Jan 2004
Location: Derby
Khadas publish the schematics for the Tone Board, so you can see exactly what should be connected to what.
Hardware Documentation | Khadas Docs
The VIM and USB 5V connections each have a diode in series, so you won't see continuity between them. There's switching logic between the VIM spdif pin and the spdif rca, so again you won't see continuity.
  Reply With Quote
Old 1st June 2019, 11:47 AM   #7
wlowes is offline wlowes  Canada
diyAudio Member
 
wlowes's Avatar
 
Join Date: Mar 2007
Location: Toronto
Default Great value

A DIYAUDIO friend brought the Tone board to my place. He just wanted someone else to hear it. He wanted to know if he was imagining that is was a very good sound for very few $.
We listened to a few tracks on my system, then the same tracks with the Tone board driven by USB from a Win10 laptop. I was surprised at how good it was. Clear, clean sound with no digital edge that I could detect in a few minutes of listening. Obviously in a different league IMO than the benchmark we compared it to, thank heavens. (my best diy effort). We swapped out the commercial RCA IC and plugged in my short diy connectors and the sound opened up. I really like the fact they publish the full circuit diagram. You could happily use this as supplied from USB, or have a bunch of fun playing around with I2S and PS.

It really does punch way above its pay grade.
  Reply With Quote
Old 1st June 2019, 12:52 PM   #8
Sebastian K is offline Sebastian K  Europe
diyAudio Member
 
Sebastian K's Avatar
 
Join Date: Aug 2018
Location: Germany, not far from the middle
I'm confused why there are the two versions (Generic and VIM). Could I use the VIM board standalone too?

(I want to set up a RasPi with a VIM board, but would like to use the Khadas board as USB DAC too.)

Regards, Sebastian
  Reply With Quote
Old 1st June 2019, 01:12 PM   #9
Yatsushiro is offline Yatsushiro  France
diyAudio Member
 
Join Date: Mar 2016
Location: Normandie, France
Sebastian

As I wrote in my earlier post:

Quote:
Originally Posted by Yatsushiro View Post
The ONLY difference between the two is that the VIM edition has the pin headers already soldered in place ready for attachment to the VIM 1 or 2 Khadas SBC. If you solder the pin headers that you were supplied with with your Generic board you effectively have a VIM edition.
So you can indeed use the 'VIM' version as a standalone board.
  Reply With Quote
Old 1st June 2019, 01:19 PM   #10
Sebastian K is offline Sebastian K  Europe
diyAudio Member
 
Sebastian K's Avatar
 
Join Date: Aug 2018
Location: Germany, not far from the middle
Yatshushiro, thanks, I missed that part somehow.

But when the VIM board can do both, why is there a generic version? The prices are same.
  Reply With Quote

Reply


Khadas Tone BoardHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Marantz PO1 Tone Board pjf610 Solid State 9 30th July 2018 08:07 AM
Wanted: LM1036 tone board (no ebay or aliexpress board) schdrag Swap Meet 0 2nd December 2016 06:47 PM
Hum in Tone Control Board whaleman Solid State 13 8th November 2010 06:42 AM


New To Site? Need Help?

All times are GMT. The time now is 10:40 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki