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Easy Circuits

Published: Aug 28,2024

Light Bulb Indicator

This is a light bulb indicator kit that blinks with music.

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Story

This light bulb's brightness is proportional to the input voltage. We all know that if you connect a light bulb to a music source this light bulb will blink with music. You can connect the light bulb indicator via audio or DC amplifier so that the device can detect low-voltage signals. You can also connect light bulbs to audio filters so that the different light bulbs can turn ON with different frequencies. You can also use comparators to create light bulb bar graph displays. This is the simplest light bulb indicator that only includes light bulb protection created with four diodes so that the voltage across the light bulb does not exceed 1.5 V. This indicator does not need a power supply. However, you will need a powerful audio amplifier to drive this indicator. The maximum input voltage is plus or minus 11.5 V. Since a 10 ohm resistor is 10 Watts the maximum voltage across the resistor will be 10 V plus 1.5 V for the light bulb.

 

Schematic and Layout
  • Assembled Kit

    Light_Bulb_Indicator_05_Assembled_152184150966cec992cbaea.jpg
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  • Schematic

    Light_Bulb_Indicator_03_Circuit_38133314166cec9a451ba7.jpg
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  • PSpice Simulations

    Light_Bulb_Indicator_04_Simulations_35351086466cec9b2b38ac.jpg
    Download(1)
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Easy Circuits

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lights, music
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