FREE: SMD CMOY with OPA2134UA

[theAnonymous1]

This board was my first attempt at a SMD CMOY headphone amp. The circuit works fine but was unsuitible for my application of driving low impedance headphones to high levels due to it's low current output. I have no use for it and put to much effort into it to just throw it away or put it in a junk pile.

This would be very suitable for high impedance phones that don't require a whole lot of current. The supply caps are rated at 16v so I would recommend a +-12v supply max. I have removed the 51R output resistors that are in the pic because they are not needed for high impedance phones. Gain is set at 11.

I will even throw in a set of LM7812 and LM7912 regulators for the low low price of FREE.

I would prefer to ship this to someone in the US or CA, but if you are overseas and really want this for whatever reason, I'm sure you can twist my arm and get me to mail it to you.

[Dag]

"When you get something for nothing you just haven't been billed for it yet"

??????

So will a nuke hit my house if I send you my adress??

[theAnonymous1]

Oh boy, that is quite the paradox now isn't it.

I guess life will just have to make an exception this time around. I promise no nukes.

EDIT: SOLD.... for free!!!

[tamasic1]

I built a cmoy (not smd) and my headphones are 60ohm Behringers. I can't possibly turn the amp all the way up, it's way too loud. I'm using a opa2134 and a single 9v battery so I don't understand why you're not getting the same output or I'm I not understanding something here?

[theAnonymous1]

Hi tamasic1,

The amp needed to drive <30 ohm phones plus be loud enough for a person with extreme hearing loss. The amp was loud enough for a normal person (just barely IMO).

I have since found a solution that worked out perfectly.

http://www.diyaudio.com/forums/showt...60#post1160860