this is very cool
I thought about it, but decided I had no time
could you please post circuit and partnumbers?
indeed, the transformers are an option. I wanted the benefit of all dac outputs, balanced signal and the extra gain. guess what? the transformers were superior in SQ as well
. so it was a double whammy without top components, the dac is already great and also with the mundorfs supplied in the kit, it plays at very high level.
as long as people are willing to spend thousands of euro for interconnects, I thing spending money on TOP components is not a waste. but it is not a MUST. the basic version with the standard components is guaranteed already for huge listening joy
. the rest is tweaking and hobby and if you have the budget, totally worth it LCD Display
Thank You DDDAC. It was fun developing, lots of potential to play!
The circuit is all in my head at the moment so will publish once documented.
Regards
this is very cool
I thought about it, but decided I had no time
could you please post circuit and partnumbers?
Thank You DDDAC. It was fun developing, lots of potential to play!
The circuit is all in my head at the moment so will publish once documented.
Regards
hi Tuyen, nice work so far !
yes you need capacitors if there is a connection between both systems ground. this is normally the case, one way or the other. if not you can try without, as long as the amp can handle a few mV DC. that is what you will measure, please check, between POS and NEG terminal....
oh, do not forget to place the jumper on the WaveIO board to "EXT"
....which would mean for tube amps to have no issue, right ? A few mV dc does not matter, a few volt would...
there is no need for any current limiting... the 10 k you refer to is probably the one for the bias according to standard datasheet design and in my case that is 6k.
still not 100% sure, what you exactly try to achieve
spot on ! and most tube amps have some sort of DC blocking further on in the signal path, so no worries of DC appearing at the speakers .....
I haven't and I don't think I'll bother to try that until the rest of my system is up to scratch.
But forum member dvb-projekt was suprised with the improvement of the rhopoint over the Texas Components TX2575 Bulk Z-Foil resistor in his dac.
http://www.diyaudio.com/forums/blogs/dvb-projekt/969-best-sounding-i-v-resistor.html
I have not tried it yet but I expect Tantalum resistors will be the best for this position.
In tube amps I use carbon film in series with the signal and tantalum to ground.
I will first try the sowters.
I have soldered in shunt regulators on the position of the 3.3v and 8v regulators, they are now burning in and I must say it is quite a big improvement in sound. I will report later with some pictures.
Regards,
Regarding output capacitors consider Jensen copper foil in oil. These come in two tastes: with aluminium cover and with paper cover. The latter one sounds better but is more expensive.
I have experiemted years ago with taking off the shrinkfoil of electrolytics and caps, this brings an audible improvement. This has to do with the foil being static and that influences the magnetic field of the capacitor, this magnetic field is generated by the AC currents running through a capacitor. If the magnetic field is influenced, it will also influence the currents; thus losing microdynamics.
The aluminum cover also has a similar effect. If you saw off this cover the sound will be MUCH better!
The oldest paper in oil capacitors that I have stripped are now around 8 years old and still measure and sound fantastic.
So this is my little "geheimtip"
Jensen has also discovered this, hence their more expensive line of caps with paper cover. Don't let them fool you.................
Regards,
I have experiemted years ago with taking off the shrinkfoil of electrolytics and caps, this brings an audible improvement. This has to do with the foil being static and that influences the magnetic field of the capacitor, this magnetic field is generated by the AC currents running through a capacitor. If the magnetic field is influenced, it will also influence the currents; thus losing microdynamics.
The aluminum cover also has a similar effect. If you saw off this cover the sound will be MUCH better!
The oldest paper in oil capacitors that I have stripped are now around 8 years old and still measure and sound fantastic.
So this is my little "geheimtip"
Jensen has also discovered this, hence their more expensive line of caps with paper cover. Don't let them fool you.................
Regards,
No article, I tried it for myself. it is not dangerous, worst thing is you destroy the cap. I have been using peeled off caps in tube amps with a few hundred volts dc on them, though I would not recommend you to do that. The dac however only has 2.7volts dc out so that is harmless.
I use a small metal saw to saw the aluminium off and used some pliers. Most of the caps (depending on value) have some room between the actual capacitor and the aluminium cover. Some caps have a bit of lose oil in them, you can clean that off.
I also tried this with electrolythics but they dry out and lose their capacity, paper in oil capacitors are very easy to modify this way.
You can leave the capacitor open or cover it with a bit of carton and tape (no plastic tape of cource)
Hi,
Here are some pictures:
-you can see the inside of the Jensen copper foil capacitors, some paper around and wooden covers.
-the complete arrangement with Alix board and custom short USB cable.
-The shunt regulators from Tentlabs for 8V and 3,3V, I had to remove some capacitors and the regulators. You can leave out the Wima because there is also one on the shunt. I still have to remove the electrolytics that are directly on the pins of the dac chip (the wima's will stay); this will give more speed/dynamics.
Next will be to mount the Sowters and two extra dac boards.
Here are some pictures:
-you can see the inside of the Jensen copper foil capacitors, some paper around and wooden covers.
-the complete arrangement with Alix board and custom short USB cable.
-The shunt regulators from Tentlabs for 8V and 3,3V, I had to remove some capacitors and the regulators. You can leave out the Wima because there is also one on the shunt. I still have to remove the electrolytics that are directly on the pins of the dac chip (the wima's will stay); this will give more speed/dynamics.
Next will be to mount the Sowters and two extra dac boards.
