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 Input on Sound Level Meter ?

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EmilHarder Posted - Oct 05 2010 : 12:05:50 PM
I am going to make the Sound Level Meter (http://www.aaroncake.net/circuits/vumeter.asp).
But ran into a problem... I can only find 1 "input-pin". Shouldn't there be 2? Is the other one the ground?

Hope someone can help.
Thanks Emil :)
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audioguru Posted - Oct 05 2010 : 12:39:35 PM
The input is the input and of course the input also needs to have a ground wire.

The peak detector transistor does not work properly. The datasheet for the LM3915 shows the same peak detector circuit but has its reference voltage set so that an input of 10V peak lights the 10th LED.
The reference voltage in this project is set at only 1.25V which causes a few lower LEDs to light all the time.

I made a sound level meter with an opamp as the peak detector. It works perfectly. The opamp is similar to the opamp circuit shown on the datasheet for the LM3915.

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