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Ditulis Oleh : YK69 Elektro
Judul : Skema Dancing LEDs, Following the Rhythm of Music

Skema Dancing LEDs, Following the Rhythm of Music

Dancing LEDs

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.

Skema Rangkaian Dancing LEDs

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.

List Component of Dancing LEDs Circuit

• 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
• C5: 100µF/25V Electrolytic Capacitor
• D1: 1N4148
• D2-D11: LEDs (any type and color)
• IC1: LM358
• IC2: 4017
• M1: electret microphone
• SW1: SPST Switch
• B1: 9V PP3 Battery

Additional circuit parts:

• R9,R10: 10K 1/4W Resistors
• R11: 56R 1/4W Resistor
• D12,D13 etc.: LEDs (any type and color)
• Q1,Q2: BC327
• Q3: BC337

Note:

• The sensitivity of the circuit can be varied changing R4 value.
• C4 value can be varied from 220 to 470nF in order to change the circuit speed-response to music peaks.
• Adopting the additional circuit, only one item for R10, R11, Q1 and Q2 is required to drive up to ten LED strips. On the contrary, one item of R9 and Q3 is necessary to drive each of the strips you decided to use.
• Each R9 input must be connected to IC2 output pins, in place of the LEDs D2-D11 shown. R8 must also be omitted.
• Whishing to use a lower number of LEDs or LED strips, pin #15 of IC2 must be disconnected from ground and connected to the first unused output pin.
• For example: if you decided to use 5 LEDs, pin #15 of IC2 must be connected to pin #1; if you decided to use 8 LEDs, pin #15 of IC2 must be connected to pin #9 etc.
• Current drawing of the circuit is about 10mA.
• Whishing to use a wall-plug adapter instead of a 9V battery, you can supply the circuit at 12V, allowing the use of up to 6 LEDs per strip, or at 15V, allowing the use of up to 7 LEDs per strip.

Source

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