micpic
Junior Member level 3
Hello,
I´m designing a noise level meter.
I use an electret mic an preamplifier and a LM3915 to drive 3 LEDs (green, yellow, red, like a traffic light).
For the first time everything is working so-so.
My problem is the high dynamic of the mic / preamp output. The Leds flicker. I want to have solid on or off states of the 3 Leds. It means: The noise is increasing-> green Led turns off and yellow Led turn on. No it is: green Led flickers / turns off for a very short time amd yellow Led turns on / flickers.
What can I do? It hougth about an rectifier or integrator?
regards mic
I´m designing a noise level meter.
I use an electret mic an preamplifier and a LM3915 to drive 3 LEDs (green, yellow, red, like a traffic light).
For the first time everything is working so-so.
My problem is the high dynamic of the mic / preamp output. The Leds flicker. I want to have solid on or off states of the 3 Leds. It means: The noise is increasing-> green Led turns off and yellow Led turn on. No it is: green Led flickers / turns off for a very short time amd yellow Led turns on / flickers.
What can I do? It hougth about an rectifier or integrator?
regards mic