Hello,
I meshed up the choke numbers. I have a few LL2771 ( 5 or so), have two LL2733.
But Doede was talking about the LL2773 which is real high current choke.
If you ask Lundahl to adjust the airgap to 425 mA ( little margin) you will need for the new DDDAC you will get a 750mH with 0,44 ohm dcr.
I wil ask Doede if he likes to try a 400mA LL2771 which will have lots of mH but also 2,8 ohm dcr.
Greetings Eduard
P.s chokes are not that expensive , they last for ages as well
I meshed up the choke numbers. I have a few LL2771 ( 5 or so), have two LL2733.
But Doede was talking about the LL2773 which is real high current choke.
If you ask Lundahl to adjust the airgap to 425 mA ( little margin) you will need for the new DDDAC you will get a 750mH with 0,44 ohm dcr.
I wil ask Doede if he likes to try a 400mA LL2771 which will have lots of mH but also 2,8 ohm dcr.
Greetings Eduard
P.s chokes are not that expensive , they last for ages as well
Dammit, I just see the posts in between and that the transformer has two separate windings. To create a center tap, it is more likely you need to connect one grey/white and one violet wire… best check is to do this and measure if you have 15 volt in between end 30 between the outer wires
I hadnt seen your message and went ahead as per your previous suggestion. I checked the voltage without connecting the supply to the dac first. All worked fine actually. I could use the trimmer to bring the voltage up to 12.5V and it has been 30minutes since i first powered it on and it has maintained the required voltage properly. Nothing overheating as well. Then i connected the psu to the dac and it played fine without any issues. Should i correct anything now? Do i need to shutdown the psu?
Mmm, too often when Problems like this occur , I See Volumino involved. No idea why, but somehow there are always some kind of unintended issues… can you switch back to 16 bits in Volumino? By the way, i have got several feedback, that the old RPI 3B gives best results overall….
Ditch the Rpi5 and follow Doede's hint on a Rpi3b, you can get them secondhand without any problemsI have a problem with playback from 24bit/96khz via RPI5 i2s (Volumio) to DDDAC1794. Only noise. 16bit/48khz plays well. With RPI4 no problems via i2s.
You're probably right but, if you see this video by the respected Hans Beekhuyzen you stick with the nimble Rpi3b.It's a way to deal with it, Smartdriver.
But I'm pretty sure it's a dumb software issue inside a config file.
Another constructive way is to dig, and communicate the solution afterwards
- Home
- Source & Line
- Digital Line Level
- A NOS 192/24 DAC with the PCM1794 (and WaveIO USB input)