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# Dancing led circuit

2014-12-15 14:52
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This article is an introduction to dance led circuit diagram. Master the principle is very effective method is to combine text read schematics. In this principle in IC1A 100X magnification audio signal through a microphone and drives recipients IC1B as a peak voltage detector. Its output is synchronized peaks peak input signal and clock IC2, rings can raise to ten decimal counter led in the sequence. An additional circuit allows the driving of up to ten, each led by a five (Max.), At 9 v supply. It is composed of a 10 ma constant current source (Q1 and Q2) common to all of the LED lamps and a switching transistor (Q3), to open a get 2 - 5 series connected LEDs. Therefore, a transistor and its base resistors need to drive each strip used. The sensitivity of the circuit can be varied changing R4 value. C4 value can vary from 220 years to 470 years in order to change the circuit speed response nf musical peaks. Using an additional circuit, only one item, R11 R10, Sections I and II must be raised to ten  LED  lamps. On the contrary, a necessary and third quarters of each one R9 driver you decide to use. Each R9 input must IC2 output pins, in place of the led display D2-D11. R8 must also be omitted. Want to use a low number of LED lamps or LED lamps, pin # 15 IC2 must be off the ground and connected to an unused output pin. Want to use a plug adapter instead of a 9 v battery, you can provide circuit 12 v, allows the use of six each, or led 15 v, allows the use of 7 led / bar.

### 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

Clip for 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```