[sdiy] LM3914 VU display PCB

[Seb Francis]

"Roy J. Tellason"NO-CC-PLEASE!. wrote:
> On Wednesday 17 May 2006 11:10 pm, Brett Maddaford wrote:
>   
>> Does anybody know of a diy or not PCB I can buy based on a LM3914 so i
>> can feed an audio input in and drive a 10 segment display?
>>     
>
> Uh,  the 3914 is a _linear_ part -- for audio you probably want the 3915,  or 
> the "VU" 3916...
>
>   

Depends how you derive the meter level from the audio.  If you use a 
true RMS level detector with a log output (e.g. THAT 2252) then the 3914 
is what you would want.

However, if you are just using some kind of simple abs-value circuit 
followed by a peak hold capacitor then the 3915 or 3916 are more suitable.

Seb

P.S. If you want to swap a couple of LM3914s for a couple of LM3916s 
then contact me offlist.