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IanCanada's Latest RPi GB Goodies Impressions... and your tweaks, mods and hints...
IanCanada's Latest RPi GB Goodies Impressions... and your tweaks, mods and hints...
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Old 7th April 2020, 05:28 PM   #1331
Grarea is offline Grarea  United Kingdom
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Join Date: Dec 2019
Location: Cornwall
Quote:
Originally Posted by wlowes View Post
Agreed. Any good PS will be a step up.
I am not clear on how you feed signal to the DAC. It sounds like USB and then the DAC reclocks? If so it seems to not take advantage of FIFOPi. Perhaps I'm confused.
Thanks.

Coaxial. From Transportpi to KTB

You can use just USB for power and Signal, but when it recognises Coax,
USB just becomes power.
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Old 7th April 2020, 08:05 PM   #1332
misterdog is offline misterdog  United Kingdom
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Join Date: Dec 2011
Location: Sheffield
Quote:
Originally Posted by Grarea View Post
LiFePO4 only has the one non-isolated 5v, but can use one of the other isolated outputs.
On my Mk 1 LiFePo4 there are 2 5V outputs (J7 and J8) One is USB A and the other a 2 pin connector.

DocumentDownload/LifePO4mkIIPowerSupplyManual.pdf at master * iancanada/DocumentDownload * GitHub
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Old 7th April 2020, 08:19 PM   #1333
Grarea is offline Grarea  United Kingdom
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Join Date: Dec 2019
Location: Cornwall
Quote:
Originally Posted by misterdog View Post
On my Mk 1 LiFePo4 there are 2 5V outputs (J7 and J8) One is USB A and the other a 2 pin connector.

DocumentDownload/LifePO4mkIIPowerSupplyManual.pdf at master * iancanada/DocumentDownload * GitHub
Ah, sorry, yes, you are obviously correct.
Thank you again.
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Old 8th April 2020, 11:44 AM   #1334
Grarea is offline Grarea  United Kingdom
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Join Date: Dec 2019
Location: Cornwall
OK, I give in.
I have forgotten what i did or didn't do.
I feel like I have tried everything but am completely confused now.

Is there a set up guide for noobs somewhere rather than filling this thread up with it?
I think i might need to change something again in Raspbian.

I wasn't as far ahead as I thought.
I think that sound was still going through the USB.
I have looked through all the settings on Raspbian and VLC, but can't seem to get it out of Coax.
I can only find HDMI output options. (which works btw. I am getting sound)

FifoPi status is empty.
Is that a light on the other side that would indicate I2S?
That is not on.

I have read the manuals, but I think i am stuck.
New at all of this. Until last year, my tool of choice was a club hammer
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Old 8th April 2020, 12:11 PM   #1335
sq225917 is offline sq225917  United Kingdom
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Join Date: Jun 2004
Location: sheffield
Send a message via MSN to sq225917 IanCanada's Latest RPi GB Goodies Impressions... and your tweaks, mods and hints...
Aren't those 2x 5V J's actually the same rail?
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Old 8th April 2020, 12:13 PM   #1336
Grarea is offline Grarea  United Kingdom
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Join Date: Dec 2019
Location: Cornwall
Yes they are.
Does that make a difference?
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Old 8th April 2020, 12:50 PM   #1337
misterdog is offline misterdog  United Kingdom
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Join Date: Dec 2011
Location: Sheffield
I think your issues are more to do with the KTB connectivity, of which I know nothing. It appears that there are several versions, some with the 40 pin GPIO connector (for Pi/FIFO)
and some with only USB input.

I knew sod all about DAC's until I assembled Ians stack, it required much reading and slowly understanding the basics.
The end result was worth the effort though, during the process I did question this though...
Luckily we have time on our hands, I have just been told to lockdown for 12 weeks !!!!
I am allowed to open my window though..

Some lite reading.
khadas tone board power supply - Google Search

i2s into khadas tone board - Google Search
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Old 8th April 2020, 01:24 PM   #1338
Grarea is offline Grarea  United Kingdom
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Join Date: Dec 2019
Location: Cornwall

Not sure if I am pleased for you or not or envious of being locked down.

Thanks for those. The first few on those searches are already highlighted as read lol.

I am trying to get Coaxial to KTB from the transportpi.
I know what you mean about reading.
Boy I have read a lot this last few months.
Not really understanding most of it.
Then understanding something and rereading with the new bit of knowledge.

I was alright running the KTB until i bring in the fifopi and transportpi. (Although I Iguess I wasn't using I2s there)
The I2S question is whether there should be an on status light on the fifopi.
I don't think I have I2S enabled or something somewhere. I think in raspbian.


What have you got in your stack?
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Old 8th April 2020, 02:09 PM   #1339
billyboyk is offline billyboyk  France
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Join Date: Mar 2008
Location: Pays de Gex
Quote:
Originally Posted by sebbyp View Post
Co-ax cable, nice idea! I may move to that too.

Do you have a photo of how you made it tidy with the shield?

Edit: did you use 75 ohm?
Sorry, I just saw you question, I use 50 ohm wire
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Old 11th April 2020, 07:34 AM   #1340
jimk04 is offline jimk04  United Kingdom
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Join Date: Jul 2018
Location: North Notts
Default DC on the output

Morning all. Hope we are keeping healthy.

Having a little measure of DC on 2 of Ian's IV Std I have here. One was problematic on delivery...it was one of the free giveaways so no issue with that. With help from Simon that got sorted and ended up in the streamer I built for my brother.

It began to show signs of DC on the signal and it triggered his amp protection once or twice when it was cranked up. He also commented on some HF distortion on one channel so I have taken it apart for testing

The numbers I got

XLR L
Pin2 75mV
Pin2 1.15v.....yes V not mV
XLR R
Pin2 75mv
Pin2 75mv

SE L 0.5V
R 0.5mV
My brother uses the balanced outputs
So clearly something amiss in the L channel. What should I be testing?

Out of interest I measured my working IV Std. I do get the smallest of clicks when altering the volume

XLR L
Pin2 51mv
Pin2 40mv

XLR R
Pin2 54mv
Pin2 40mv

SE L
0.5mV
R 4mv

So my SE R is maybe higher than it should be? I use the SE outputs

Any advice on what I should look for?

Thanks
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