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Cmoy with low 9v battery

post #1 of 7
4/21/09 at 8:30pm
Thread Starter 
I have a Cmoy per Tanget's specs, but using one 9v battery.

When a battery gets low, what types of things can occur?
Do you hear lower volumes even when the pot is turned up?
Do hear sound degradation?
Do you lose signal on either sides of the channel?

What is considered low on a 9v battery when in a Cmoy?
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post #2 of 7
4/21/09 at 11:06pm
Quote:
Originally Posted by BlizzofOZ View Post
I have a Cmoy per Tanget's specs, but using one 9v battery.

When a battery gets low, what types of things can occur?
Do you hear lower volumes even when the pot is turned up?
Do hear sound degradation?
Do you lose signal on either sides of the channel?

What is considered low on a 9v battery when in a Cmoy?

Mostly sound degradation, it might not be entirely obvious at first, but it gets worse as the battery gets lower. The low point depends which op amp is used.
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post #3 of 7
4/21/09 at 11:38pm
Quote:
Originally Posted by BlizzofOZ View Post
When a battery gets low, what types of things can occur?
Do you hear lower volumes even when the pot is turned up?
Do hear sound degradation?
Do you lose signal on either sides of the channel?
First you get some clipping, then the sound cuts out altogether.
Volume shouldn't be affected.

Quote:
Originally Posted by BlizzofOZ View Post
What is considered low on a 9v battery when in a Cmoy?
Varies by op-amp. Some can get really close to V+/V- and work on really low voltages, others need a lot of overhead.
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post #4 of 7
4/21/09 at 11:45pm
Thread Starter 
Quote:
Originally Posted by r_d View Post
First you get some clipping, then the sound cuts out altogether.

I seen this term before... what is clipping?

It is obvious to me it is the battery, as either I get sound degradation (like static) or it seems cut in/out. Put in newer battery, works fine. Put back the old one, same results.

I ran into this before, just was curious of some the results of using a low battery.
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post #5 of 7
4/21/09 at 11:50pm
Clipping occurs when you reach the edge of an amplifier's ability to maintain that level of gain (that's not entirely accurate or precise, but that's the idea). Sound waves will be "clipped" at the top and bottom, so instead of a nice round curvy hill, you get a plateau on the top/bottom of each wave.
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post #6 of 7
4/21/09 at 11:50pm
Quote:
Originally Posted by BlizzofOZ View Post
I seen this term before... what is clipping?
Clipping (signal processing) - Wikipedia, the free encyclopedia
Basically, it's when the tops/bottoms of a waveform get cut off.
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post #7 of 7
4/22/09 at 8:17am
Thread Starter 
Ah, clipping must be the distortion that I'm hearing. I was calling it sound degradation or a static like sound.

Thanks!
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