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Cmoy testing-is this right? - Page 2

post #16 of 24
4/16/10 at 11:07am
I've used this kind of stuff between a board and a metal case:

Buy Craft Foam Sheets by Foamies for Less

You can pick it up at the dollar store.

As it is foam, it handles the point bits on the bottom of the board well.
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post #17 of 24
4/16/10 at 11:17am
Thread Starter 
Quote:
Originally Posted by cobaltmute View Post
I've used this kind of stuff between a board and a metal case:

Buy Craft Foam Sheets by Foamies for Less

You can pick it up at the dollar store.

As it is foam, it handles the point bits on the bottom of the board well.
That looks like it would work...and I think I might have some of that already :P Only thing is the added height of it...the caps are close to/barely hitting the top of the tin. Do I need to put some protection there too?
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post #18 of 24
4/16/10 at 4:04pm
Quote:
Originally Posted by nate911 View Post
Poster board sounds easier to find I think.
I can get it at the grocery store here in small town America. Every office supply store should have it. In case you're not sure what it is I'm talking about, it's just the heavy paperboard people use for posters and temporary signs. It often comes in neon green and orange as well as white and other sane colors. You know the stuff, I'm sure.
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post #19 of 24
4/16/10 at 5:54pm
Thread Starter 
Quote:
Originally Posted by nate911 View Post
That looks like it would work...and I think I might have some of that already :P Only thing is the added height of it...the caps are close to/barely hitting the top of the tin. Do I need to put some protection there too?
Just checking.

Quote:
Originally Posted by tangent View Post
I can get it at the grocery store here in small town America. Every office supply store should have it. In case you're not sure what it is I'm talking about, it's just the heavy paperboard people use for posters and temporary signs. It often comes in neon green and orange as well as white and other sane colors. You know the stuff, I'm sure.
Yep, I've got some already actually...so that helps
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post #20 of 24
4/27/10 at 9:09pm
Thread Starter 
I've had the amp finished for a few days, but I have a question...
The sound seems to change as I move the pot, especially towards the max. When I turn the pot up past around 3 o clock, the mids seem to disappear and the highs get really harsh... Is that normal?
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post #21 of 24
4/28/10 at 7:27am
Nope. See Basic Troubleshooting for Headphone Amplifiers
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post #22 of 24
4/28/10 at 8:37pm
Thread Starter 
Quote:
Originally Posted by tangent View Post
I can't seem to find anything wrong...I've cleaned the board, checked for bad/bridged connections, and tried tracing the signal but I couldn't get the readings described for the op amp (maybe it doesn't work for the Cmoy?). If it means anything, the AC voltage from ground to V+ on the opamp is 8.3V...my gain is 5.

I was inaccurate in my description earlier; the sound is good up until 2-3 o'clock on the knob. After that, the highs get really overpowering and it's painful to listen to...
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post #23 of 24
4/28/10 at 9:52pm
Quote:
Originally Posted by nate911 View Post
I was inaccurate in my description earlier; the sound is good up until 2-3 o'clock on the knob. After that, the highs get really overpowering and it's painful to listen to...
clipping, too low supply voltage?

or the op amp cannot supply enough current
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post #24 of 24
4/28/10 at 10:06pm
Thread Starter 
Quote:
Originally Posted by Spacehead View Post
clipping, too low supply voltage?

or the op amp cannot supply enough current
Okay, well I'm only running one 9V and last I checked, it's at about 8.5V. If I were to try two batteries...how exactly would I hook them up in series?
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