Dancing LEDs Circuit Diagram


LED sequencer: follows the rhythm of music or speech, 9V Battery-operated portable unit

The basic circuit illuminates up to ten LEDs in sequence, following the rhythm of music or speech picked-up by a small microphone. The expanded version can drive up to ten strips, formed by up to five LEDs each, at 9V supply. IC1A amplifies about 100 times the audio signal picked-up by the microphone and drives IC1B acting as peak-voltage detector. Its output peaks are synchronous with the peaks of the input signal and clock IC2, a ring decade counter capable of driving up to ten LEDs in sequence.

An additional circuit allows the driving of up to ten strips, made up by five LEDs each (max.), at 9V supply. It is formed by a 10mA constant current source (Q1 & Q2) common to all LED strips and by a switching transistor (Q3), driving a strip obtained from 2 to 5 series-connected LEDs. Therefore one transistor and its Base resistor are required to drive each of the strips used.

Circuit diagram:
 dancing leds schematic circuit diagram
Dancing LEDs Circuit Diagram
Parts:

R1_____________10K 1/4W Resistor
R2,R3__________47K 1/4W Resistors
R4______________1K 1/4W Resistor
R5,R6,R7______100K 1/4W Resistors
R8____________820R 1/4W Resistor
C1,C3_________100nF 63V Ceramic or Polyester Capacitors
C2_____________10µF 50V Electrolytic Capacitor
C4____________330nF 63V Polyester Capacitor (See Notes)
C5____________100µF 25V Electrolytic Capacitor
D1___________1N4148 75V 150mA Diode
D2-D11_________5 or 3mm. LEDs (any type and color)
IC1___________LM358 Low Power Dual Op-amp
IC2____________4017 Decade counter with 10 decoded outputs IC
M1_____________Miniature electret microphone
SW1____________SPST miniature Slider Switch
B1_______________9V PP3 Battery

Additional circuit parts (see Notes):

R9,R10_________10K 1/4W Resistors
R11____________56R 1/4W Resistor
D12,D13 etc.____5 or 3mm. LEDs (any type and color)
Q1,Q2_________BC327 45V 800mA PNP Transistors
Q3____________BC337 45V 800mA NPN Transistor

Notes:
Source: Red Free Circuit Design