555 lights remind
Posted on Mar 28, 2007 11784
As shown for the lights to remind the circuit. The circuit consists of monostable delay circuit, driving circuit, buzzer, light-emitting diodes and other components. Wherein th
e one-shot output signal from the delay circuit 555 and R1, C3 composed of control behind the circuit.After the lights from the direction of the lamp power supply circuit in the relay through the diode is added to 555 feet, so that the capacitor C3 is charged via R1. As the charging progresses, foot potential rise when foot potential reaches 2/3VDD (approximately l minute delay) after 555 rollover occurs, low output enable pin BG conduction. Corresponding drive LED light, buzzer, the sound and light signals to alert drivers timely lights.Circuit in the lights corresponding to the length of time that is the delay time of the circuit can be changed by adjusting the time constant R1C3. When this circuit is implemented in the direction of the driver forgot to turn off lights, turn off the power in time to remind drivers.