Category Archives: Lighting and LED Circuit

Touch Sensitive LED

Posted on June 16, 2010 by Rust

Below is the simplest circuit you can get. We can use any NPN. Connect the 220 ohm resistor, LED and transistor as shown in the figure below. Touch the top point with two fingers of one hand and the lower … Continue reading →

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Single Cell LED Flashlight

Posted on May 24, 2010 by Rend

This is Single Cell LED Flashlight circuit. This circuit uses white LED that has best power-efficiency combination at about 20mA and requires abut 3.3V. Each Led in this circuit draws power about 66mW. This circuit uses seven LEDs. This circuit … Continue reading →

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Music/Sound Controlled Disco Light

Posted on May 20, 2010 by Rust

The mains supply can be conveniently reduced with no heat dissipation by the reactance of C1; then rectified by D1 (1N4007) and D2 (1N4007) and clamped to 24V by the Zener Diode D3 (24V) due to the very low current … Continue reading →