Cheap TI PCB suitable for "CMOY"

theAnonymous1 · 25th November 2011, 06:20 PM

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

GloBug · 25th November 2011, 07:12 PM

Hey that's pretty cool! Good idea.

My little cMoy (P2P) got me started in "HiFi".

theAnonymous1 · 25th November 2011, 07:37 PM

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.

qusp · 03:22 AM

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

sofaspud · 26th November 2011, 04:41 AM

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?

theAnonymous1 · 26th November 2011, 01:15 PM

Quote:

Originally Posted by sofaspud

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.

qusp · 26th November 2011, 03:01 PM

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?

25th November 2011, 06:20 PM	#1
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	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 __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

25th November 2011, 07:37 PM	#3
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	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. __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

26th November 2011, 03:20 AM	#4
qusp is choosing a less facetious title... diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	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.

26th November 2011, 04:41 AM	#5
sofaspud diyAudio Member Join Date: Nov 2005 Location: San Antonio	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? __________________ It is error only, and not truth, that shrinks from enquiry. - Thomas Paine

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25th November 2011, 07:12 PM	#2
GloBug Banned Join Date: Jun 2011	Hey that's pretty cool! Good idea. My little cMoy (P2P) got me started in "HiFi".

26th November 2011, 03:01 PM	#7
qusp is choosing a less facetious title... diyAudio Member Join Date: Oct 2009 Location: Brisbane, Australia	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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