Hello, i have problem with this dac again , somewhere is short circuit maybe ve + on xlr shows 1.568 volts that's minimum i can set with trim pot. The voltage regulator the middle one gets very hot 90c and first from left 80c. The last from left stays coldest at 40c. Is it possible to find problem?

Hi. I changed it, but still same. Can it be transistors? I replaced only one Jfet on XLR side. Also might damaged trace cause this? I see some scratches just near XLR output socket.

Good side - 1 : 1.205v 2 : 1.230v 3 : 13.85v 4 : 13.85v 5 : 13.85v 6: 13.85v Bad side - 1: 1.205v 2 : 1.497v 3: 12.66v 4: 12.46v 5: 12.43v 6: 12.57v

Bad side arrows from left to right : 13.25v , -12.84v , -12.22v Good side : 1.582v , -14.84 , -14.23v

Hmm where is that diode? Maybe possible to ordered it and replace?🙂 can be transistors too?

No cables connected. Good side C - 0.627v D - 2.0v Bad side C-. 2.74v D -. 2.01.4v

1.64v , 1.64v 204.6mV , 474.3mV

Looking at picture above A - left resistor 3.486 volts and right resistor 3.03v. B - upper resistor 231mV and fluctuating. Lower resistor 443mV and fluctuating aswell. I don't see 4 resistors on B hehe. Only measured ones you marked in photo.

Hi. Working side shows around 1.66v and faulty side 1 resistor 3.00v and other 3.50v that's at A. And at B left resistor 220mV and right one around 450mV and constantly changing.

I have TX2575-3 0.6w but only one each. Just remembered that DC offset was stable few weeks ago on right channel can transistor go bad if accidentally shorting XLR outputs? XLR cable touched power amp speaker outputs and right channel went silent untill restarting DAC.

Thank you very much, I thought something serious. Which place to measure rail voltages on board?

Lowest seen was -9mv to 10mv , most time sits around -5 to 5mV jumps around very fast though. Tried getting closest to 0 with XLR trimmer, as soon as closer to 0 it shoots away. Closer to 0 more sensitive to trim. I think it's something more serious then.

It sounded fine, have not listened yet with new trim pots. What's the limit of mV DC for use?

It's mundorf silver gold or so, i don't like how it flows, well it doesn't flow or shine at all. Original was Cardas and it's better. I will try to clean. Thank you

Thank you. Some update when switching on unit all 3 trimmer resistors showed stable around 0v , but that right one 4.11v! turning resistor down to around 0v goes very fast not like others. But doesn't stay stable voltage goes up and down. Like it's too sensitive. I have tried swapping resistor...

Here pictures, the most right one XLR trimmer fluctuates. Removed trim pot and can see some damage on trace, I remember not long ago somehow i managed to short xlr while swapping cables and right channel went quiet until i switched DAC off and on again.

Hello, i installed Vishay trim pots , left channel adjusted very easy to 0 DC ,but right channel fluctuating very much. Pins 2-1 set fine no fluctuation but pins 2-3 unstable impossible to set. What could be wrong? Same with RCA.

Thank you b0bb. I will try to use them in my speakers or power amp boards.

Hi! I have few capacitors leftover, 6 Amtrans amco 0.22uF and 4 Leclanché Signal path tin foil. also 0.22uF. Anywhere i could use them in this DAC?:)

Thanks for answer! Runs perfect now 15.5 - 15.5 !

My analog power rails are off balance, any way to balance? One channel 14.7 and other one is 15.4v.

This looks sick! Great job!

What does the trimmers add? Where to measure them?

Would these work? https://www.ebay.com/itm/2-pcs-SPRAGUE-109D-Wet-Slug-Tantalum-Capacitors-150uF-30V/284021664990?ssPageName=STRK:MEBIDX:IT&_trksid=p2060353.m2749.l2649 109D Wet Slug Tantalum Capacitors 150uF/ 30V

Hi! Haven't tried these but i see they are expensive. I would like to try in future :)