The output stage is .... no output stage ;-)
Have you tried it from the raw ladder output?
//
Have you tried it from the raw ladder output?
//
I assume you want the best sound and I think the consensus is that skipping the active output stage is the best.
But, class D it is not 🙂 and if you needed to ask that I doubt that you really are up to the task to make a better stage than already exists on the board.... or was that a joke?
//
But, class D it is not 🙂 and if you needed to ask that I doubt that you really are up to the task to make a better stage than already exists on the board.... or was that a joke?
//
Not required any sorry - it's OK.
I just want to understand if I have on board D class or A class? Thats all. RAW output I had use on my 300B SE, but now I have changed amp to Pathos Logos than RAW output sound not so good. I can't explain sound, just I listen degradation if I'm not using opamps buffer.
Than as you assumed - want to understand can I do some A class buffer for output or not required, as I'm not HW eng. in audio.
I have never seen a line out stage in class D - this dont exits.
Not very big difference between A and AB.
You are probably not used to listen to such a clean output as DAM out direct. Maybe you should seek if you have other problem in system?
//
Not very big difference between A and AB.
You are probably not used to listen to such a clean output as DAM out direct. Maybe you should seek if you have other problem in system?
//
I don't hear a difference between the differential output stage and the raw output (and I am a very picky listener) as long as a) the external power supply provides very clean ca. +/-10V DC, b) decoupling is added on the board in the manner I've explained in this thread and c) proper grounding rules are strictly followed.
There seems to be no regulation for the on board op amps, so HQ power supply and correct grounding layout is critical.
There seems to be no regulation for the on board op amps, so HQ power supply and correct grounding layout is critical.
Can anyone recommend a USB to serial adapter that works with the rev 7 board?
The one I have works fine with the rev 1 but after I got the rev 7 I can’t connect via the RS232.
The one I have works fine with the rev 1 but after I got the rev 7 I can’t connect via the RS232.
I see now that Søren on his soekris.dk website advises to aquire a USB to TTL Serial interface, also called a USB to RPi Serial interface. The recommended one is the FTDI TTL-232R-RPI. I’ll try that one.
A few days ago, a very strange thing happened to me. I would like to point out that I use a DAM1021 Soekris ver.7 connected to a JLSound Asynchronous USB to I2S interface
I2SoverUSB v.III. while listening, randomly and suddenly the volume increases a lot, without me having touched anything. Any reasons and solutions? Thanks for your help.
I2SoverUSB v.III. while listening, randomly and suddenly the volume increases a lot, without me having touched anything. Any reasons and solutions? Thanks for your help.
The JLSound board has certainly nothing to do with this. Do you use an analogue pot to control the volume on the DAM?
What was you player software?
Did you configure your DA to a fixed level (00) or do you utilise it's digital volume control - if so, how; with a connected analog potentiometer or by command line commands?
//
Did you configure your DA to a fixed level (00) or do you utilise it's digital volume control - if so, how; with a connected analog potentiometer or by command line commands?
//
Sorry, my question wasn't clear enough: is the pot controlling the volume through the analogue port on the DAM?
If it is, a worn out pot may randomly provide wrong readings to the port due to a shaky wiper connection. A replacement or a cap between wiper and gnd may fix it.
If you have other means of controlling the volume you can also remove the pot and see if the issue is resolved.