interfacing leds with arm7 friendly circuit

Due to the low duty cycle of the flashing LED, the average current drain is 1 mA or less. The circuit described involves a flashing LED that operates with a low duty cycle, resulting in a significantly reduced average current draw....

1A Low Noise High Current LED Torch/Flash

An ultralow dropout current source maintains accurate LED current at very low ILED voltages. Automatic mode switching optimizes efficiency by monitoring the voltage across the LED current source and switching modes only when ILED dropout is detected. The LTC3216 is...

led table reading lamp circuit

This LED table or reading lamp circuit can be utilized for various applications, such as a reading lamp for a bed, a desktop or table lamp, a keyboard lamp (to illuminate the keys of a computer keyboard in low light),...

LED STEREO SOUND LEVEL INDICATOR

LED stereo sound level indicator for audio amplifier. Many circuits can be designed as level indicators by using a comparator IC or transistors, but... The LED stereo sound level indicator serves as a visual representation of the audio signal levels in...

200 LEDs Christmas Lights circuit

This simple and inexpensive circuit built around a popular CMOS hex inverter IC CD4069UB offers four sequential switching outputs that may be used to control 200 LEDs (50 LEDs per channel), driven directly from mains supply. Input supply of 230V...

Fairy Flashing LED Lights

This simple and inexpensive circuit is not limited to Christmas. It consists of two resistors, a small-signal transistor such as a BC547, one flashing LED, and a string of standard LEDs. The flashing LED functions as an oscillator, turning the...

230V Blinking LED

A pulsating light is used for signaling purposes with a voltage of 230V. A simple circuit has been designed, consisting of an LED diode, two capacitors, two resistors, a diac, and a diode. The operation of the circuit is straightforward....

LED Flash Driver with HT2050

This circuit is based around HT2050 manufactured by HOLTEK semiconductors. It is a low cost, low-power C-MOS LSI designed for lamp and LED flash driver. It requires minimum external components. You can operate it with just two AAA cells or...

classic led flasher circuit

This LED flasher circuit is a classic two-transistor flip-flop. It is a popular circuit often built by beginners in the electronics hobby. The schematic diagram of this well-known LED flasher circuit includes two transistors, two capacitors, four resistors, and two...