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CS6A4689 Headphone amplifier project
CS6A4689 Headphone amplifier project
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Old 18th July 2017, 04:48 PM   #21
ammel68 is offline ammel68  United States
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CS6A4689 Headphone amplifier project
Quote:
Originally Posted by tedkok View Post
Actually, I was wondering if I put this amplifier to Kickstart, will
you guys be my honored supporters? If that's the case, what price range will you be willing to pay for it? say, assembled PCB, and assembled PCB with CNC AL case.
First, what is Kickstart?

How can someone place a value on someone's project? You're the only one who knows what all the parts, case and labor costs.
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Old 19th July 2017, 02:30 AM   #22
wfkwong is offline wfkwong  Hong Kong
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if put it in kickstart, i will support the project. Related to Price problem, I agree with ammel68
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Old 23rd July 2017, 02:27 AM   #23
tedkok is offline tedkok  Hong Kong
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The test result of the headphone amplifier is excellent, but we find a bug...when the battery voltage drop but not low enough, the DC-DC converter will still struggle to pump the +/-10V output for the amplifier, which results in not enough current to supply to the amplifier IC, and in some case, one power rail (either + or - supply rail) will drop to a lower voltage while the other still functioning properly. In this case, the IC will not be powered properly, and the close loop design will make the output stage of the IC to drift to one side, and create high output current drive for the failed power rail. Eventually, the output will shut down, but the IC will also burn out. To avoid this situation, we have added a watch dog IC CS7P61C-22 which will output a low when the input voltage (the battery voltage) is lower than 2.2V to the circuit. This output will directly tied to the power on delay circuit, and hence stopped the power on circuit from working and turn off the whole headphone. To indicate the lower battery condition, a NMOS M2 is added to turn on a LED to tell the user that the system cannot turn on because of low battery voltage.

Attached is the modification of the power on delay circuit
Attached Images
File Type: png under-voltage.png (49.8 KB, 148 views)
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Old 23rd July 2017, 02:41 AM   #24
ammel68 is offline ammel68  United States
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CS6A4689 Headphone amplifier project
Tedkok, can you answer my questions in post 21?
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Old 23rd July 2017, 06:01 AM   #25
tedkok is offline tedkok  Hong Kong
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Thanks ammel68 for pointing out that it should be Kickstarter
instead of kickstart......

Concerning about the pricing issue, it's common for marketing to gather information before pricing a particular item. It's true that the public won't exactly the FOB price of a product, and so is the manufacturer won't know exactly what's the acceptable price in the market. I am just trying to pick the brain of the reader of this thread to get some idea about how much are they willing to pay for such a fine headphone amplifier, such as to determine if it is a profitable business, or something that will lose money.
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Old 2nd October 2017, 11:02 PM   #26
tjstyle is offline tjstyle
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Quote:
Originally Posted by tedkok View Post
From a 3.7V Li-ion battery to +/-10V dual rail supply, we applied the CS7D651 DC-DC converter. A very low noise DC-DC converter with enough output current for the high performance CS6A4689 amplifier IC

Noted that a simple connection of the DC-DC output and the amplifier with do the job in raw.....but with power on pop....We shall show you how we resolve that problem in my next post
Interested to test CS7D651, but there is no enough information for this chip and where to buy.
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Old 8th October 2017, 01:47 PM   #27
tedkok is offline tedkok  Hong Kong
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You can visit Canaan's website at

CANAAN | Semiconductor

to get the first page of the datasheet, or you can contact Clere Electronics at

Canaan Semiconductor - Clere Electronics

to purchase some samples, or even the PCBA of this headphone amplifier

enjoy!
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Old 17th October 2017, 09:35 AM   #28
newmatrix is offline newmatrix  Ukraine
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Interesting project, class A, MOSFET ...
CS6A4689 - Data Sheet
14 Vpp on THD + N ≥ 0.01%, f = 1kHz, RL=2K+Vcc = 9V, -VEE = -9V
Very good. But - "This product is not yet available to purchase via the website, or is no longer in stock"

Last edited by newmatrix; 17th October 2017 at 09:49 AM.
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Old 21st October 2017, 05:41 PM   #29
tedkok is offline tedkok  Hong Kong
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Dear newmatrix,

If you are interested to purchase some CS6A4689 for your own DIY projects, you can get it from Clere

http://www.clere.com/suppliers/canaan-semiconductor

or Profusion

Canaan CS6A4689: High Performance Headphone Amps – Profusion

The ICs are available, and you can just send them emails and ask them to quote to you.
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Old 8th November 2017, 01:07 PM   #30
tedkok is offline tedkok  Hong Kong
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Join Date: Feb 2015
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Default APTX BT upgrade

The headphone amplifier can be upgraded to include an APTX BT audio module to build a APTX BT portable headphone amplifier. The BT schematic is simple
Attached Images
File Type: png BT.png (18.7 KB, 29 views)
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