Amplifier Circuit DiagramsLCD-LED Display

Noisy LEDs Schematic Circuit Diagram

Versatile Intelligent LEDs: A Spectrum of Possibilities

In the present era, a multitude of intelligent LEDs flood the market. These LEDs boast diverse capabilities, ranging from flashing and color-changing abilities to varied speeds and unique color combinations. Among these, the rainbow LEDs, which smoothly transition from one color to another, have found an alternative and intriguing application. When connected as illustrated in this circuit, these LEDs unexpectedly generate intricate and complex sounds, adding a fascinating dimension to their functionalities.

Noisy LEDs Schematic Circuit Diagram

Fine-Tuning the Sound: Adjusting Current and Resistance

The potential divider R1/P1 plays a crucial role in regulating the current flowing through the LEDs and significantly influences the generated sound. Its value can be set within a wide range, roughly between 100 Ω and 100 kΩ. In this setup, a resistor and a preset were utilized to achieve the desired value. For simplicity, the preset can be eliminated, and experimentation can be carried out with the series resistor R1 to achieve the desired effect. Adding more LEDs to the circuit enhances the sounds as the LEDs engage in a sort of energetic competition for energy.

Crafting Sound Quality: Low-Pass Filtering and Capacitance

A low-pass filter is formed by C2 and resistor R2. A starting value of about 10 nF is recommended to explore the full range of sounds. If a deeper, more resonant sound is preferred, C2 can be increased to approximately 1 µF or even 10 µF. C1 plays a role in eliminating any DC voltage from the output, ensuring clean audio signals.

Voltage Supply and Precautions: Managing Amplifier Output

The circuit operates within a supply voltage range of approximately 4 V to 10 V, contingent on R1’s value and the specific LEDs employed. Before connecting this circuit, it is imperative to fully reduce the volume on the amplifier, as the output signal’s level can vary significantly, avoiding any sudden loud sounds upon connection.

Internet Links
Demo film: http://youtu.
be/z_aOeCGBZlk
The version uses different LEDs and
4.7 μF for C2: http://youtu.be/
vbITTveORRA

The voltages are generally in the range of 100–240 V (always expressed as root-mean-square voltage). The two commonly used frequencies are 50 Hz and 60 Hz.
Ohms Law and Power
  1. To find the Voltage, ( V ) [ V = I x R ] V (volts) = I (amps) x R (Ω)
  2. To find the Current, ( I ) [ I = V ÷ R ] I (amps) = V (volts) ÷ R (Ω)
  3. To find the Resistance, ( R ) [ R = V ÷ I ] R (Ω) = V (volts) ÷ I (amps)
  4. To find the Power (P) [ P = V x I ] P (watts) = V (volts) x I (amps)
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