LED bar peak program meter display for audio

Posted on Oct 27, 2012

A bar column of LEDs is arranged so that as the audio signal level increases, more LEDs in the column light up. The LEDs are arranged vertically in 6 dB steps. A fast response time and a one second decay time give an accurate response to transients and a low `flicker` decay characteristic. On each of the op amps inverting inputs is a dc reference voltage, which increases in 6 dB steps. All noninverting inputs are tied together and connected to the positive peak envelope of the audio signal

LED bar peak program meter display for audio
Click here to download the full size of the above Circuit.

Thus, as this envelope exceeds a particular voltage reference, the op amp output goes high and the LED lights up. Also, all the LEDs below this are illuminated.

Leave Comment

characters left:

New Circuits



Popular Circuits

Lowpass filter has improved step response
AVR Frequency Meter
Circuit monitors blinking phone lights
Telephone handset tone dial encoder
75 meter qrp ssb transceiver
Triac Applications
Induction Cooker
Advertising lights controller circuit diagram 555