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Old 5th November 2017, 12:25 AM   #861
jameshillj is offline jameshillj  Australia
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Are the values of the 22uF caps critical, especially the one to ground on the -ve input of the IC?

Any benefit in using bigger/polyester type caps here?
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Old 5th November 2017, 05:09 AM   #862
wayne is offline wayne  United States
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No the cap values are not that critical. Mostly just values we stock.
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Old 7th November 2017, 08:22 PM   #863
Tix88 is offline Tix88  Italy
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Hi guys,
I'm starting to mount the board, I have some questions
I am using red led 3.5mm, r9-r10-r13-r14 empty, c10-c8 220uf, r16-22-29-32 10ohm, so is it correct?
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Old 7th November 2017, 09:37 PM   #864
wayne is offline wayne  United States
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Yes that is correct.
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Old 8th November 2017, 01:09 AM   #865
Russellc is offline Russellc  United States
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Originally Posted by drpro View Post
Swapped the AD823 with a Sparkos SS3602. Has turned out to be a really nice match with the rest of the parts. Voices are pleasant, mids are present without being harsh, the highs are crystal clear and soft to the ears. Definitely worth a listen. To my ears really makes all of Wayne's work shine.
Who is a recommended source for the Sparkos SS3602 devices? Quick search turned up Ebay, who absent a trusted seller I do not trust.

I take it they are quite a bit larger than the AD823 units? Any pics of how you wired them?

Russellc
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Old 8th November 2017, 01:47 AM   #866
drpro is offline drpro  United States
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Straight from Home - SparkoS Labs Inc. Russell. I will take apart my HPA tomorrow and snap a pic. Sparkos sends a DIP spacer so it fits nicely above the two caps on either end of the socket.
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Old 8th November 2017, 06:12 AM   #867
Tix88 is offline Tix88  Italy
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Quote:
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Yes that is correct.
Thank you for the reply. What does it mean to use a 17.4V instead of 15V power supply?
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Old 8th November 2017, 05:08 PM   #868
wayne is offline wayne  United States
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Thank you for the reply. What does it mean to use a 17.4V instead of 15V power supply?
Not much difference a bit more power output but hardly matters for headphones. The heat goes up in the output stage and less heat in the regulators. I like the LEDs as power indicators.
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Old 8th November 2017, 06:01 PM   #869
Tix88 is offline Tix88  Italy
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Hi
Here's my board almost complete.
I have used dale resistor ptf65 and rn60 & rn 65,for capacitors panasonic fc , nichicon fine gold, and Mundorf supreme evo oil, resistors are all 0.1%, matched led.
I'm waiting for 2sk / 2sj matched and then we can go to the test.
For the op-amp try OPA2228PA and OPA2132PA and maybe later discrete OPA
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Old 8th November 2017, 06:16 PM   #870
Russellc is offline Russellc  United States
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Straight from Home - SparkoS Labs Inc. Russell. I will take apart my HPA tomorrow and snap a pic. Sparkos sends a DIP spacer so it fits nicely above the two caps on either end of the socket.
Great, thanks for the info, I need to finish mine up!

Russellc
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