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VU meter in a headphone amp, affect sound quality?

post #1 of 6
4/22/11 at 8:58pm
Thread Starter 

I am planning on building a headphone amp (the Millet MOSFET Max to use with a K702 in particular), and was interested in building a VU meter into it.

Iwould use this chip: http://www.national.com/mpf/LM/LM3916.html#Overview.

I was wondering what would be the easiest way to implement this, without affecting the sound quality. Thanks!

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post #2 of 6
4/23/11 at 3:55am

Follow the directions in the data sheet.

The chip is a high impedance load and will not affect the sound quality.

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post #3 of 6
4/24/11 at 11:55am

I drew this up last night.

LED 1 through 10 can be bent flat to the edge of the board.

I just used the default 1.25 volt reference. R1 sets the LED

brightness. The 5 volt regulator keep U1 power dissipation

down.

 

VU Meter Schematic.png

 

VU Meter Board.png

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post #4 of 6
4/24/11 at 12:10pm
Thread Starter 

Thanks a lot! Should I be using Diodes also?


Edited by ryli - 4/24/11 at 12:46pm
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post #5 of 6
4/24/11 at 12:32pm


You don't need to, I just drew the simplest form of the meter.

The circuit works the same for 3914/3915/3916. If you want

other features from the data sheet let me know and, if I have

time, I can draw that up too.

 

Quote:
Originally Posted by ryli View Post

Thanks a lot! Should I be using a Diodes also?



 

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post #6 of 6
4/24/11 at 12:40pm
Thread Starter 

Thanks again! you were super helpful =D

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