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OLD THREAD DAC End by Andrea Ciuffoli

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#705
Ekkeri said:
What type of specs the L1 & L1 120µH should have? Current, tolerance, resistance, core, shielding..? Any recommentations what manufacturer / part number to use? Those are in pretty critical place in the signal path..
Click to expand...

Output current from AD1865 is 8mA, so that won't be a limiting factor..

How about this:
Digi-Key - M9947-ND (Manufacturer - RL824-121K-RC)

I'm not completely happy with those. Audionote seems to be using their own silver wire chokes.. 🙁
Ferrite core, if I remember right..

What kind of choke would be the best? Any analog filter designers here? 🙂
 
#708
mikel_ann said:
I talked to a guy in Germany cause the transformer. He is building perfect transformers for valve-amps.

The Anode-current is 30-36 mA per valve, ís that right ?

We can get a very good transformer for "payable money" which delivers
3 x 12v / 1 x 9V and 1 x 250V.

Hope to can tell you more next week.

regards Michael
Click to expand...
I'm interested too. Your previous GB on AD1865 has been executed perfectly.
 
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#709
sugden said:
I check my local Farnell & RS website, they selling Vishay Roederstain MKP1837 0.1uF & 0.01uF very expensive. I will find other source. Can i use Sprague Black Beauty 0.01uF/600V as input cap. at C28 & C29 on DAC-end board? Thanks
Click to expand...

Yes! it is a good way! I had to place on the PCB for better use capacitors in the input (C28, C29) or can use the cap better if you have it. the sound is better when you choice the better cap for input! Not need 0.01uf/600V, 100V is Ok

The output capacitor (c26, c26= 0.01uf ) // R 200 Ohm you use only mica is ok
 
#715
Today I got the info for that custom transformer.

It is M85 core with primery 230V

and secondary:

1) 0 - 250, 100mA
2) 0 - 8, 3A
3) 0 - 12, 500mA
4) 0 - 12, 500mA
5) 0 - 12, 500mA

Price is 76,- EUR(simple) and 84,- EUR (covered, which i would prefer).
It is : Ausführung B, vergossen mit Haube

You can have a look at Netztrafos

I ordered there before and Gerd Reinhöfer ist doing a really good job.

If anyone interested, please let me know. I would like to order mine next week, cause the delivery time is 4 - 6 weeks.

regards Michael
 
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