10X10 Dot Bar Equalizer / Marzlishah Zubir @ Omar and Azman Wahab

10X10 Dot Bar Equalizer is an electronic device that changes an audio signal to waveform output on an LED display board. This circuit used 100 pieces of LED, one unit of IC LM3915N (Display Dnver), one unit of IC 4017B (Decade Counter), one unit of IC 4011 (Quad 2 Input NAND Gate), three variables resistors and two units of capacitors.
The Display Driver controls the display that interfaced to the LED display panel. Meanwhile the horizontal output was controlled by the Decade Counter and die Quad 2 Input NAND Gate is used to control the speed of the LEDs that had been interfaced by the Decade Counter.
A +9V supply (battery) is used to generate the circuit and the display will blink when an audio signal input pinned into the input point. This circuit acts like the other equalizer circuit but the simplification and the cost make it a bit different from the other equalizer circuit, Any audio system such as television, radio or any audio appliances commonly use this circuit. It is because these device can produce an audio signal and as a result, a beautiful light blinks is displayed through the arrangement of LED’s.