electronic wine?

[dman4486 5,000+ posts]

curious question,

anyone know what/why would cause an amp to produce a super high pitch(like a tv) wine when at 12.5 volts, but completely quiet at 14.7? it is coming directly from the amp itself not the speakers

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[dman4486 5,000+ posts]

bump

 

[bk12321 10+ year member]

*whine

I thought this thread was about buying alcohol online....

 

[dman4486 5,000+ posts]

*whine
I thought this thread was about buying alcohol online....

good point...never thought about that

 

[iDesignBoxes 10+ year member]

Does the amp have a fan?

 

[dman4486 5,000+ posts]

Does the amp have a fan?

never thought about this, but i had one amp connected before, and now i have 2 connected, and the second has a fan

 

[zeuolaxxx 10+ year member]

how do you know the whine comes directly from speaker?

 

[dman4486 5,000+ posts]

how do you know the whine comes directly from speaker?

from the amp, and because i have ears

 

[Trey803 5,000+ posts]

why dont you take the cover off and try to locate the source by ear.....be careful not to touch anything as it may shock you and/or blow the amp

 

[dman4486 5,000+ posts]

why dont you take the cover off and try to locate the source by ear.....be careful not to touch anything as it may shock you and/or blow the amp

if i can figure out where the noise is coming from, and take a pic, can someone tell me what the culprit is, and what i can do about it?

 

[iDesignBoxes 10+ year member]

It may be the fan. Dust particles will build up and create tension on the motor, therefore causing a whine. Solution:

 

[thylantyr 10+ year member]

A car audio power supply can 'squeek' in sound under load. For instance, lets say you

took the cover off and placed your ear next to the transformer, the toriod. Operate the

amp under heavy load, burp it, you may hear a squeel........ chirp chirp..... for every burp.

This is because the switching frequency is dropping under load and the switching frequency

is suppose to be outside the audible range, way beyond 20khz. Under load, the switcher

may drop in frequency to the audible range, hence the chirp...

This is not a good design and a good amplifier shouldn't do this unless it's broken or something else weird is going on.

But in your case, you hear the amp squeel when the input voltage rises from 12v to 14v,

it also seems like the switcher is having problems with it's switching frequency. The lower

voltage is tweaking the amplifier out when it shouldn't. Maybe something is broke....

Broke-back amplifier?

That's my weird take on this.