I like to build a VU meter from a PIC micro.Just searched on net & I found couple of projects. Basically I need to show the sound level on 10 to 16 LEDs.
I have some doubts regarding the hardware interface to PIC ADC.The below project used a signal diode and a filter cap feeding to ADC.
320volt.com
My questions are
*If we feed the audio input from a pre amp output it will not scale to 5V ADC because line out voltages has something like 200-300mV. How is he scaling?
*Does one half wave is it enough?
*How often do I have to read ADC?
I have some doubts regarding the hardware interface to PIC ADC.The below project used a signal diode and a filter cap feeding to ADC.
![320volt.com](https://320volt.com/en/wp-content/uploads/2012/03/vumeter-volume-unit-vu-meter-or-standard-volume-indicator-led-leds-audio-bar.jpg)
Microcontroller Controlled VU Meter Circuit – Electronics Projects Circuits
KA2281 integrated circuits, LM3914, etc. According to the vu meter circuits with this circuit has been built on microcontroller circuit pic16f88 stereo really s
![320volt.com](https://320volt.com/320volt-32.png)
My questions are
*If we feed the audio input from a pre amp output it will not scale to 5V ADC because line out voltages has something like 200-300mV. How is he scaling?
*Does one half wave is it enough?
*How often do I have to read ADC?