LED Sound level display circuit by using IC LM3915


Posted on Feb 5, 2014

This is a simple audio sound level LED display circuit diagram. The circuit is completely based on a single ic LM3915 from National Semiconductor. The LM3915 is a monolithic integrated circuit. It displays the audio sound level in terms of 10 LEDs and providing a logarithmic 3 dB/step analog display. The audio sound level LED display circuit can o


LED Sound level display circuit by using IC LM3915
Click here to download the full size of the above Circuit.

perate from a single supply 3V to 25V. But I suggest to use 9-12V. LED brightness can be controlled with a single pot( variable resistor) as shown 10K ohm in the circuit. Connect the audio input signal in Pin-5 of LM3915 from output of a audio device like output of audio amplifier or any other source. The Pin-9 of LM3915 is to select dot or bar mode display. To make the circuit moving dot display instead of a bar graph display disconnect the Pin-9 from +V.




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

14V Switching Power Supply
voltage to frequency converter
12V to 5V 3A DC converter step down Regulator
OEM AUX Light Switch Diagram
Ford Mustang convertible top inoperable for down operation.
400 Hz SERVO AMPLIFIER
ZN414 portable Receiver
AM Synchronous Demodulator
FET high input impedance wideband amplifiers



Top