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VU meter in a headphone amp, affect sound quality?

post #1 of 8
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 8
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 8
4/24/11 at 11:55am

Updated Schematic...original had errors

 

 

700

 

Please note this schematic includes optional components.

Not all components are used in all configuration.

Refer to the data sheet.


Edited by Avro_Arrow - 1/6/13 at 12:26pm
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post #4 of 8
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 8
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 8
4/24/11 at 12:40pm
Thread Starter 

Thanks again! you were super helpful =D

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post #7 of 8
1/6/13 at 10:15am
Thread Starter 

It took me a while to actually get around to building this part, but it seems that the positive and negative are flipped in the above diagram, compared to the datasheet.

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post #8 of 8
1/6/13 at 12:23pm
Quote:
Originally Posted by ryli View Post

It took me a while to actually get around to building this part, but it seems that the positive and negative are flipped in the above diagram, compared to the datasheet.


You're right!

 

Schematic revised.

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