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AK4396: best solution for output stage
AK4396: best solution for output stage
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Old 13th June 2018, 03:07 AM   #251
gabdx is offline gabdx  Canada
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The best solution would be tubes.

Thinking of 12au7 input differential amplifier and Broskie unbalancer with 6DJ8.

Along the lines of a 230 - 245 V power supply depending on the chokes and current around 40ma for stereo.

Still to determinate... dual chokes power supply or single choke.

Input resistor, 330 to 510 ohm Not sure why or not.

10K to ground after dac V out


From page 2 of the schematic:
R1 R2, uncertain 10K to 1M ?
R3 R4, uncertain 300 to 500?
R6, 7R
R7, R8, 24K
R9,R10,R11, R12, 20 to 27K , uncertain
R13, R14, 150 to 250, uncertain,
R15 1M
C5 and C6 filters around 50pf to 60pf

One big question is why not bypass the Rk of the unbalancer?
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Old 21st June 2018, 11:51 PM   #252
gabdx is offline gabdx  Canada
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From page 2 of the (internet available, I/V unbalancer) schematic:
R1 R2, Set to 3.3k I was going to use 10K but I found other builders and other schematic with a 2.5K to ground. 3.3K is the ideal resistor that I found by trial and error to load only one side of the signal into a transistor I/V (symmetrical cascode?) and unless the distortion is too high I will keep this resistor, maybe 6.6K would be appropriate too.
Note10 on the manual of AK4396 specify 1.5K minimum for DC load. at 3.3K should keep the dac happy!
R3 R4, Set to 300R
R6, = 7R or a little higher
R7, R8, = 24K (2watts at least)
R9,R10,R11, R12, Set to 20K or a little higher
R13, R14, set to 200 or a little more
R15 = 1M
C5 and C6 filters around 50pf to 60pf

C3 output cap, = 3uf to 5uf with bypass

I wonder if the 300 ohm output impedance would drive HD650 headphones...
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