Experience with this DIY DAC ?

[johnm]

Originally Posted by Bill Fuss

Actually John, the Jensen circuit isn't a direct load, it's a filter. It might be just right for you, and don't be afraid to try different cap values.

I may have been hasty to point the finger of blame at the lack of any secondary load. Installed another pre-amp and the sound is far more balanced now (my suspicions were aroused when my vinyl sounded too bright as well - this is all after installing Elna Cerafine caps in the output of my Quad 34... but that's off topic here). Incredibly open sound and the detail is insane... but not forced out at you, if that makes sense! There is still the odd crescendo that makes me wince but it may well be worth it for this sense of openness. Still I'll give the secondary filter a try just to make sure.

- J

[piedro1]

The solder pad next to the yellow wire should be shorted, as well as the pad on the other side of the board. Furthermore, the setting Coax vs Optical is switched (rev. 8). The board is working fine now.

[data]

Originally Posted by idlehands

The output must be on one of the the legs of the DIN adapter, I suppose that each adapter pin directly corresponds to the chip leg, clearly it would be prudent to check this before soldering.

Those tiny holes are a nightmare Chinese.

I soldered to the adapter pins on top and you are correct, they do correspond with the chip legs, I just refered to the DACs data sheet and tested with a multi.
Though he may want to do the solder joins quick as he would not want to heat the chip too much.

[Havoc08]

Could the Lundahl LL-1517 be used as audio transformer for this application? I can't seem to find hoe many ohms the prim. and sec. are, but maybe some of you enlightened people know? http://www.lundahl.se/pdfs/datash/1517.pdf

[jkeny]

Originally Posted by Havoc08

Could the Lundahl LL-1517 be used as audio transformer for this application? I can't seem to find hoe many ohms the prim. and sec. are, but maybe some of you enlightened people know? http://www.lundahl.se/pdfs/datash/1517.pdf

I think this trafo wants to be driven with a negative impedance of -18ohm AFAIR, so the answer is likely to be no, it can't be used!

[Havoc08]

thx jkeny and damn.. I could get these really cheap around £50-£70 a pair.

I might just have to try the edcors then as I'm on a budget

[jkeny]

Originally Posted by Havoc08

thx jkeny and damn.. I could get these really cheap around £50-£70 a pair.

I might just have to try the edcors then as I'm on a budget

I picked up some Sescom MI-97 (NOS & working) on ebay for $50 the pair (I avoided the $83 shipping to Europe by getting a friendly US citizen to act as forwarder) - so that might be a possibility!

[Bill Fuss]

Originally Posted by Havoc08

Could the Lundahl LL-1517 be used as audio transformer for this application? I can't seem to find hoe many ohms the prim. and sec. are, but maybe some of you enlightened people know? http://www.lundahl.se/pdfs/datash/1517.pdf

Should work great. You cant lose.

[McGyver]

Lundahl 1517 has DC resistance on primary about 9 ohms, so it can overload DAC output, it can even fry it because at lowest frequencies it's almost a short.

[Havoc08]

erm I seem to get conflicting information now?

So it can or cannot be used? McGyver can you add a resistor to increase the resistance of the primary?