Photo electric street light circuit

This simple LED torch is powered by a 2-transistor blocking oscillator that increases the voltage from a 1.5V cell. The design utilizes the natural current limiting characteristics of a 150 µH choke to prevent the white LED from being overdriven....

ac line powered leds

The circuit shown demonstrates how to power one or two LEDs from a 120-volt AC line by utilizing a capacitor to reduce the voltage and a small resistor to limit the inrush current. Because the capacitor needs to conduct current...

2 LED Flasher

This is a 2 LED flashing circuit. It is based on an analog flip flop circuit. This particular circuit was calculated to use blue or white 3V LED with a 12V power supply. If you are using red green or...

Random Flasher for 8 LEDs Project

This project flashes eight LEDs in a seemingly random manner. It utilizes a 4026 combined counter and display driver integrated circuit (IC) designed for driving 7-segment LED displays. The sequence is not entirely random, as seven of the LEDs represent...

LEDs Revisited

LEDs come in various sizes and shapes, with the most common being round-topped cylinders with diameters of either 3 mm or 5 mm. These sizes are often referred to as T1 (3 mm) and T1 (5 mm). The body of...

Flashing Heart

This circuit is a doorbell system featuring flashing LEDs to enhance its visual appeal. The integrated circuit IC1 (NE555) is utilized as a clock generator, configured as an astable multivibrator. The output frequency can be adjusted using the potentiometer VR1....

LED Voltmeter for Cars

The circuit is a comparator that can measure the voltage of a car battery in steps of 1 Volt. The voltage is determined after comparing the voltage of the battery, which is applied to the inverting inputs of amplifiers, with...

Search Light Signal

This circuit controls a searchlight-type signal head and produces solid red, yellow, or green indications. The signals can be connected for normal or approach-type lighting of the green signal. The circuit utilizes an LM556 dual timer IC in a complementary...

1.5V LED Flasher Circuits

Several 1.5 V LED flasher circuits can be found online, and four of them are presented here. The flasher circuits operate on a single 1.5 V power supply. The design of a 1.5 V LED flasher circuit typically involves a few...