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?
Any benefit in using bigger/polyester type caps here?
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?
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?
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
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.
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.
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
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
Attachments
Finished the headphone amp and after testing some of the kids headphones I thought I would give it a try on my Sonido fullrange speakers. It drivers them nicely, even with the low gain it played louder than I would ever listen.
BDP
BDP
I'm interested in the Sparkos. I have used OPA627 all this time with excellent results, but it would not be wrong to listen something else.
Please, Could you comment how they sound?
Please, Could you comment how they sound?
I tested both.
The soundstage of the sparkos was closer. Not fresh details like 627.
In my opinion the 627 sound much more better.
The soundstage of the sparkos was closer. Not fresh details like 627.
In my opinion the 627 sound much more better.
Thanks Meldano!!!
I´m glad to hear from you 🙂
The problem is that overcoming the sound of 627 is very difficult IMO
I am also thinking of the Muse as an option.
Actually, wouldn't it be good to have a circuit for a balanced version, and possibly with X-feed too - the 'THAT Corporation' chips work pretty well
Attachments
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