Ben,
TDA pin 1 to D1 diode check yields .83v 2.40mOhm, and reversing leads on D1 for diode yields and open circuit, so that's a problem. D1 is oriented correctly, but maybe my -20 smoked it.
Also, all other diodes are oriented correctly.
I've ordered a fresh board from Ryan, because this is getting a bit frustrating....But, I will get there....
Cheers,
Greg
Hi Greg,
I just realized that my previous measurements at pin 1 and D1 were with my I2S/Simultaneous board connected. With nothing connected to WS1, positive probe on pin 1, negative on D1, 0.94kohm and 1.1V. Negative probe on pin 1 and positive probe on D1, 0.94kohm, 0.96V.
Probes at pin 1 (LE/WS) and ground are as previously measured.
Ben
I just realized that my previous measurements at pin 1 and D1 were with my I2S/Simultaneous board connected. With nothing connected to WS1, positive probe on pin 1, negative on D1, 0.94kohm and 1.1V. Negative probe on pin 1 and positive probe on D1, 0.94kohm, 0.96V.
Probes at pin 1 (LE/WS) and ground are as previously measured.
Ben
Ben,
At this point, i just don’t know what is wrong with WS1, but clearly that is the problem with my board. The reverse voltage on the LL4150 is 50, so they should all be fine.
I’ve got another board ordered and and at this point, I think I will just start over. I’ve learned a lot about this design and feel pretty confident that I will get the next build done right: starting with the regs and testing voltages before moving on.
Cheers,
Greg
At this point, i just don’t know what is wrong with WS1, but clearly that is the problem with my board. The reverse voltage on the LL4150 is 50, so they should all be fine.
I’ve got another board ordered and and at this point, I think I will just start over. I’ve learned a lot about this design and feel pretty confident that I will get the next build done right: starting with the regs and testing voltages before moving on.
Cheers,
Greg
Hi Greg,
You are probably close. You can always put in new diodes for the WS input if the WS input is not working right now.
Your power supplies are working, and you are getting output. So you are close.
Ben
You are probably close. You can always put in new diodes for the WS input if the WS input is not working right now.
Your power supplies are working, and you are getting output. So you are close.
Ben
Greg,
Those photos show that your LE ufl connector has a solder blob on the gnd shroud. And also check to see if you have DR and DL around the right way.
Those photos show that your LE ufl connector has a solder blob on the gnd shroud. And also check to see if you have DR and DL around the right way.
Ben,
I need to replace two U.FLs on the D3, and I think that will get me going. Need to order some.
I think the diodes are all fine.
Cheers,
Greg
Hi Greg,
Were you measuring with the shorted U.FL sockets still on the board, or did you remove them first. If they were still shorted, that would have affected the measurements.
You may be able to reuse the sockets if the problem was too much solder. Just remove them and remove all of the solder and resolder them. Use only a small amount of solder to avoid shorting them again.
Ben
Were you measuring with the shorted U.FL sockets still on the board, or did you remove them first. If they were still shorted, that would have affected the measurements.
You may be able to reuse the sockets if the problem was too much solder. Just remove them and remove all of the solder and resolder them. Use only a small amount of solder to avoid shorting them again.
Ben
Ben,
Yes, I've removed the U.FL LE socket. I fixed the solder blob a while ago and now it's completely removed. Diode checking from the positive pad (DMM Common ) to Cathode on D1 (DMM Positive) yields .52v drop. So, D1 is good.
Cheers,
Greg
Ryan,
I did remove that blob and ensured that there was not a short. I'm going to replace the U.FL male because I'm just not sure about it at this point.
DR and DL are indeed oriented correctly.
LE / WS1 was the first U.FL that I soldered and I did not get it right the first time (solder shunted underneath). It was removed, pads cleaned, and re-mounted.
Cheers,
Greg
Ben,
All measurements were done with good U.FL sockets, meaning open and correct orientation. The part I'm confused about is your reverse diode measurement of LE. I only get a "1" when I reverse. Meaning, a good diode check at D1: common on Cathode (positive pad on LE) and positive probe on Anode of D1.
I'm just not understanding what you are saying, when you get a voltage reading both ways.
I must be doing something wrong.
Greg
When I left last week I had not made any input or output connections to the D3 only power and I couldn't zero out a channel.
When I got home I had received the cheap COAX to I2S board for testing. I made all connections and tried to play music through it. It worked and in stereo. Then I checked DC offset and the channel that was zeroed before I left was still zeroed and the other could now be adjusted and zeroed. Also the test TDA1541A that sounds fuzzy in a CD player test bed sounds good in the D3 with no fuzziness.
I am not sure why it now works and maybe there wasn't anything wrong, but it sounds pretty nice with just the basic parts for operation. I will be upgrading things as I go.
Good luck and I hope you get to hear it soon Greg! Also Greg what is your I/V stage? I looked up "Abass hybrid SS / tube I/V" and I couldn't find anything.
Mark K.
When I got home I had received the cheap COAX to I2S board for testing. I made all connections and tried to play music through it. It worked and in stereo. Then I checked DC offset and the channel that was zeroed before I left was still zeroed and the other could now be adjusted and zeroed. Also the test TDA1541A that sounds fuzzy in a CD player test bed sounds good in the D3 with no fuzziness.
I am not sure why it now works and maybe there wasn't anything wrong, but it sounds pretty nice with just the basic parts for operation. I will be upgrading things as I go.
Good luck and I hope you get to hear it soon Greg! Also Greg what is your I/V stage? I looked up "Abass hybrid SS / tube I/V" and I couldn't find anything.
Mark K.
Mark,
Abbas Audio: 6n6p (like 5687 tube) EZ80 abbasaudio I/U convertor, for TDA1540,TDA1541 | eBay
This is not the exact I / V (different rectifier tube) but is the same otherwise.
Cheers,
Greg
Abbas Audio: 6n6p (like 5687 tube) EZ80 abbasaudio I/U convertor, for TDA1540,TDA1541 | eBay
This is not the exact I / V (different rectifier tube) but is the same otherwise.
Cheers,
Greg
OK this is gonna be fun!!
Got everything plugged it, lots of lovely little leds glowing all over the place. All my supply voltages check out. I'm happy with that side of things.
BUT No sound and no scope for troubleshooting so lets look at the easy stuff first.
Diode on my I2S>Simultaneous board was reversed so sorted that out first off.
Not sure if I am tweaking the offset correctly? I'm using D1 Nelson Pass I/V - I soldered it ages ago and it has been sitting waiting for me so it is untested. I have depopulated the I/V arrangement on the Distinction board and feeding the D1 directly - correct?
So like a real man I go back to read instructions about the D1 and found I was probing the wrong thing (output) to zero the DC (input) - got that sorted. Nice on both sides as good as zero
BUT No sound
Oh look!! Doh! I have the output wires from DAC reversed - sorted.
BUT No sound
Let's wait - yep here it comes!!! Those caps take longer to charge than on my Arcam Alpha board version - different caps.
MUSIC!!! SO I am going to call that as good as going first go around!! Lucky me!!
Got a standard chip in there at the moment - will give it a few hours just to check there are no problems arising before I pop a S1 in there.
First impressions, bearing in mind for me this is new DAC circuit and a new I/V that I am listening to (other DAC is valve output) and everything is fresh in there I fancy it might be a bit sibilant but I will reserve judgement of course until after a fair few hours.
I'll post some pics once I have finished tidying up the wires and have the case finalised - may have to cut some more ventilation into it on account of 3x Reflektor-Ds and other thermal generators in there. Might slap a heat sink on top of the TDA as well.
Very happy with my week. Have about 48hrs to spare before my partner gets back from her work trip - should be able to finish the case work by then. For now going to swap a few of my favourite tracks through there to have a listen. Celebratory beers will be drank tonight that is for sure.
Best wishes to the others on this thread trying to get theirs going.
Got everything plugged it, lots of lovely little leds glowing all over the place. All my supply voltages check out. I'm happy with that side of things.
BUT No sound and no scope for troubleshooting so lets look at the easy stuff first.
Diode on my I2S>Simultaneous board was reversed so sorted that out first off.
Not sure if I am tweaking the offset correctly? I'm using D1 Nelson Pass I/V - I soldered it ages ago and it has been sitting waiting for me so it is untested. I have depopulated the I/V arrangement on the Distinction board and feeding the D1 directly - correct?
So like a real man I go back to read instructions about the D1 and found I was probing the wrong thing (output) to zero the DC (input) - got that sorted. Nice on both sides as good as zero
BUT No sound
Oh look!! Doh! I have the output wires from DAC reversed - sorted.
BUT No sound
Let's wait - yep here it comes!!! Those caps take longer to charge than on my Arcam Alpha board version - different caps.
MUSIC!!! SO I am going to call that as good as going first go around!! Lucky me!!
Got a standard chip in there at the moment - will give it a few hours just to check there are no problems arising before I pop a S1 in there.
First impressions, bearing in mind for me this is new DAC circuit and a new I/V that I am listening to (other DAC is valve output) and everything is fresh in there I fancy it might be a bit sibilant but I will reserve judgement of course until after a fair few hours.
I'll post some pics once I have finished tidying up the wires and have the case finalised - may have to cut some more ventilation into it on account of 3x Reflektor-Ds and other thermal generators in there. Might slap a heat sink on top of the TDA as well.
Very happy with my week. Have about 48hrs to spare before my partner gets back from her work trip - should be able to finish the case work by then. For now going to swap a few of my favourite tracks through there to have a listen. Celebratory beers will be drank tonight that is for sure.
Best wishes to the others on this thread trying to get theirs going.