ksb3 timer


Posted on Feb 5, 2014

Knowing the three operational modes the 555 timer offers, it`s not hard to imagine its many applications in IC circuit designs: Oscillator: The 555 timer can be used as a simple clock pulse generator (up to 1 or 2 MHz) A monostable timer is a one-stable timer; that is, it returns to its original (stable) state (off) after a certain period of time. Monostable operation is characterized by the clothes iron,


ksb3 timer
Click here to download the full size of the above Circuit.

which switches itself off after being unattended for 10 minutes. Each time the iron is moved, a small sensor resets the timer to zero to begin another count. The iron remains on as long as it is moved within the 10-minute limit. The 555 timer chip uses two external components, a resistor (R1) and a capacitor (C1), which act together to form a circuit that times the monostable pulse. Changing the values of either or both of these components will change the electricity. Resistors are components that oppose the flow of current. By using a resistor in the circuit, the time it takes to charge or discharge a capacitor can be changed. By changing the time it takes for the capacitor to charge, you can change the timing duration of the output of the 555 timer chip. This can be done by replacing the capacitor with one of larger or smaller value or by replacing the resistor with one of larger or smaller value. An astable timer is one that is constantly pulsing, never staying in one state or the other. It is constantly switching between its two states. The flashing light or pulsing buzzer that warns that the seat belts are not fastened when you start a car is an example of astable operation. In this mode, the output pulse is fed back into the chip to trigger another pulse, and the result is a continuous pulsed signal. As shown in the schematic diagram, an astable timer can blink an LED. Other devices, such as a buzzer or a speaker, can...




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Zero-crossing detector
    Bar-graph indicator for ac signals
    convert square wave inverters to sine wave inverter
    Amp Monoblock UL
    USB sound card
    Electronic Roulette wheel with 20 LEDs and with 36 LEDs



    Top