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Universal buffer/headamp based on OPA1622
Universal buffer/headamp based on OPA1622
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Old 20th September 2018, 02:49 PM   #311
xrk971 is online now xrk971  United States
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Universal buffer/headamp based on OPA1622
Yes, they are pricey but wanted to make a HPA that could drive any headphone load including the Hifiman HE-6 (83.5dB 50ohms and needs circa 2w to 3w). The 8x just gives a lot of current of about 1 amp. Could theoretically drive 8ohm speakers to 18w I think.
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Old 20th September 2018, 03:43 PM   #312
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Universal buffer/headamp based on OPA1622
I did not know such headphones exist.
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Old 20th September 2018, 04:00 PM   #313
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Universal buffer/headamp based on OPA1622
Quote:
Originally Posted by Dibya View Post
Can I suggest to use a I2S isolated from Texas instruments?
What about cm6632a on different board and dac+amp on other?
Isolated I2S or better USB bus all together is my plan. I would also prefer to keep USB receiver and DAC together on the same PCB since sending I2S signal through a pair of connectors and a wire with hard to control characteristic impedance is asking for trouble which otherwise can be avoided. I am not an expert (yet ) in high speed circuit design but I do understand the effects involved and would not risk compromising performance due to lack of practical experience.
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Old 20th September 2018, 04:08 PM   #314
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Universal buffer/headamp based on OPA1622
I just did a little more reading on the HE-6, InnerFidelity tested it and said measured sensitivity is actually only 77.5dB. But apparently the HE-6 sounds fantastic when driven with a big amp for improved headroom. I have an HE-400i (much more sensitive) but same technology. A planar diaphragm with conductive traces stretched across a bunch of Nd magnets.

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Old 20th September 2018, 04:13 PM   #315
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Universal buffer/headamp based on OPA1622
Well, these are pricey headphones! I've built myself a pair of Zaph Audio ZDT3.5 for comparable amount of money...
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Old 20th September 2018, 04:36 PM   #316
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Universal buffer/headamp based on OPA1622
Quote:
Originally Posted by OlegSh View Post
Isolated I2S or better USB bus all together is my plan. I would also prefer to keep USB receiver and DAC together on the same PCB since sending I2S signal through a pair of connectors and a wire with hard to control characteristic impedance is asking for trouble which otherwise can be avoided. I am not an expert (yet ) in high speed circuit design but I do understand the effects involved and would not risk compromising performance due to lack of practical experience.

TI's PCM2704 even if not high end ('only' 98dB DR and 48kHz max fs) integrate the USB interface and the DAC, it is available in SSOP package, allowing you to design a very compact board with OPA1622 headamp or line output.


Typical implementation could look like this : USB audio DAC with PCM2704

Last edited by AIM65; 20th September 2018 at 04:38 PM. Reason: add link to Pavouk site
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Old 20th September 2018, 04:39 PM   #317
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Universal buffer/headamp based on OPA1622
PCM2704/05 is at the top of my list.
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