Programmable LED Flashers
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Airplane Flight Timer
The following circuit illustrates an Airplane Flight Timer Circuit Diagram. Features include switches in the closed position and battery voltage maintained at a safe level.
The Airplane Flight Timer Circuit is designed to provide a reliable timing mechanism for monitoring flight...
Key Illuminator Circuit
Used as a 10-second momentary illuminator, this circuit can be useful in other applications as well. Pressing SI charges CI, which holds Q1 on and keeps the LED lit for about 10 seconds.
The circuit described functions as a momentary illuminator,...
KNIGHT RIDER lights
The circuit consists of two building blocks. The first is a square wave oscillator made up of two transistors in a multivibrator arrangement and the second is a CD 4017 decade counter IC. The multivibrator contains two extra components to...
PWM Motor Speed Control Using Class D Audio Amplifier
This is a Class D audio amplifier circuit that is used to control PWM motor speed. This circuit has two advantages for battery-powered portable devices. First,
The Class D audio amplifier circuit is designed to efficiently manage the speed of...
LED Boost Circuit
The completed board may be driven by voltages between 0.8 and 3 Volts. While the basic design goal was candle-like light from a single cell, the values used were chosen to allow safe operation from 3 Volts so you can,...
White LED Head Lamp
This is a practical white LED head mount lamp (flashlight). Recently many white LED flashlights appear on the market. However, most flashlights require three cells because they are regulating output current with only series resistor. The odd number of cells...
Digital Calender Circuit
This is a digital calendar circuit that utilizes a microcontroller to display the date, day, and month on an LED display. The entire system is managed by an 8-bit microcontroller, which operates based on a program embedded in its ROM....
Programmable Clock Oscillator
This is a voltage controller oscillator that was designed as a wide range oscillator to generate clock pulses for a stepper motor drive system. It does however have some interesting features. The original application used a stepper motor for its...
Pulse Width Modulation DC Motor Control
Often, people attempt to control DC motors with a variable resistor or variable resistor connected to a transistor. While the latter approach works well, it generates heat and hence wastes power. This simple pulse width modulation DC motor control eliminates...