ultra low power led flasher
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flip flop led flashing circuit
A schematic of a flip-flop LED flashing circuit is presented. This circuit functions as an astable multivibrator that activates LEDs sequentially upon power application. It is compatible with voltage inputs ranging from 6 to 12 volts, and can also operate...
Bicycle Back Safety Light Circuit
This circuit has been designed to provide a clearly visible light, formed by 13 high-efficiency flashing LEDs arranged in a pseudo-rotating order. Due to low voltage, low drain battery operation, and small size, the device is suitable for mounting on...
Timing within the one-chip computer Counter and interrupt system
This document will present an overview of two critical components within a one-chip computer: the timing/counter system and the interrupt system. Through this explanation, readers will gain insight into the operating principles of these systems. For illustration, consider an alarm...
The LED car voltmeter (2)
This document introduces an LED car voltmeter constructed using the op-amp LM312 and LED components. It is designed to display six voltage levels ranging from 10V to 15V, with each level representing a 1V increment. The working principle of the...
cell phone signal activated led
A simple and interesting project schematic for a cell phone signal-activated LED circuit. The circuit will illuminate an LED when a call is made from a cell phone.
This cell phone signal-activated LED circuit utilizes a basic principle of detecting the...
Led flasher
A relaxation oscillator is employed to flash an LED in the base circuit. The capacitor C1 is charged slowly through resistor R1 by the power source, and then it is discharged periodically through resistor R3 and the LED by the...
High resolution dithering bar graph display
This circuit is an enhanced version of the display shown in Fig. 3-28, utilizing a triangular-wave oscillator. When the resistor RA is adjusted correctly, each incremental change in the input voltage (VIN) can be detected, allowing the glow from each...
Mains Powered White LED and Grand Prix Starting Lights circuit
An array of white LEDs can serve as a small lamp for the living room. LED lamps are readily available, resembling standard halogen lamps, and can be installed in a standard 230-V light fixture. A capacitor is employed to reduce...
STRESS METER
It consisted of 16 LEDs in a circle with two touch pads. By placing your fingers on the touch pads, the circuit started and ran the LEDs in a "chaser" pattern around the display, with a beep each time a...