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Old 25th November 2011, 06:20 PM   #1
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Default Cheap TI PCB suitable for "CMOY"

Just found this PCB while browsing TI's site and figured I would pass on the info for anyone experimenting or planning on building a "CMOY" style headphone amp.

The PCB is only $5 and allows for pretty much any dual channel op-amp configuration....

FREE DEM-OPA-SO-2A - DEM-OPA-SO-2A - TI Tool Folder

There is also a single channel version....

DEM-OPA-SO-1A Unpopulated PCB Compatible w/High Speed Wide Bandwidth Op Amps in 8-lead SOIC (D) Pkg - DEM-OPA-SO-1A - TI Tool Folder
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Old 25th November 2011, 07:12 PM   #2
GloBug is offline GloBug  Canada
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Hey that's pretty cool! Good idea.

My little cMoy (P2P) got me started in "HiFi".
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Old 25th November 2011, 07:37 PM   #3
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Some begginers might be put off by the fact it's surface mount, but that shouldn't stop them.

The very first kit I ever put together nearly 7 years ago was SMD; never soldered through-hole let alone SMD before that. It turned out well for a first project and I'm glad I jumped right in the SMD waters, head first.
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Old 26th November 2011, 03:20 AM   #4
qusp is offline qusp  Australia
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do keep in mind those that are beginners building this, that you should either omit or increase substantially the input resistors R1 a/b and reduce or omit the output damping resistors R7a/b if running anything but rather high impedance headphones. the board as shown is designed for 50ohms input and output for measurement purposes

Last edited by qusp; 26th November 2011 at 03:22 AM.
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Old 26th November 2011, 04:41 AM   #5
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Could someone answer a question for me, please? In the docs for this board, what is the rectangular "glue area" shown on the PCB bottom view?
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Old 26th November 2011, 01:15 PM   #6
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Quote:
Originally Posted by sofaspud View Post
In the docs for this board, what is the rectangular "glue area" shown on the PCB bottom view?
Ha, that had me stumped as well.
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Old 26th November 2011, 03:01 PM   #7
qusp is offline qusp  Australia
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hehe me too, i thought perhaps it could be so that people could make 2 x single sided PCBs into a double sided project since not everyone is up for diying 2 sided pcbs?
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