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CMOY tweaks for low impedence cans...

post #1 of 5
11/5/09 at 6:00pm
Thread Starter 
Hello everybody, I'm still set on doing a batch of mini^3's, and I'm right now trying to find some people locally with an interest in them... and will try and make enough that I can get my money back on the parts and have mine be close to free.

Anyway, between now and then I'm itching to do another project and I think what I want to do is re-do my cmoy, one thing I want to do is lower the gain to about 3-4, probably to 4, and from there see if I need to tweak the feedback resistors, I want to eliminate noise.

Also, I've found I go through batteries too quickly, and the amp sounds good all the way down to almost nought on the battery. I'm thinking if I can cram 2 9v's in with it, I can manage to get more battery time per battery out of the setup.

Can anybody think of any other good tweaks for a cmoy?
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post #2 of 5
11/5/09 at 6:57pm
I liked dhaninugraha's dual mono cmoy:

http://www.head-fi.org/forums/f6/pos...ml#post6135390
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post #3 of 5
11/5/09 at 7:12pm
Thread Starter 
Quote:
Originally Posted by Emooze View Post
I liked dhaninugraha's dual mono cmoy:

http://www.head-fi.org/forums/f6/pos...ml#post6135390
I don't want to put a whole new one together, I just wanna move to dual 9v so I can get more use out of my batteries, redo the casework so it's more compact and appropriately setup, and lower the gain and maybe put resistors in the feedback section to further lower noise. I'm wanting to take what I've already got and see if tweaking it will turn it into a more appropriate portable amplifier. Portability is still an important factor, as it's completely outclassed by my little dot I+, and it doesn't matter what kind of cmoy you put together, it'd still more than likely be outclassed by my I+ when I'm done tube and opa rolling.

It needs to stay portable, so size matters. I may have to order up one of those pots with a power switch built into it to save space.
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post #4 of 5
11/6/09 at 2:44am
Thread Starter 
I got it rebuilt.
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From this:
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To This:
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Ready for the UHP336 that was shipped today.
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post #5 of 5
11/6/09 at 7:54am
Most 6F22 NiMH batteries are 200 - 250 mAh, so if you parallel two of them you'll get 400 - 500 mAh. 7 AAAs will take up less space and give you 1000 mAh. A CMOY in a mint tin could easily be built to house AAA's and a charger.
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