Posts Tagged ‘NE556’

Car Burglar Alarm timer delay using NE556

Car Burglar Alarm timer alarm system circuit , model to economize. This circuit convenients for to set up in an automobile. usually switch at set up keep with automobile door will the circuit closes. But in case of car owner opens in and out while note as a result have no result anything , because of the transistor model PNP to still don’t work. Because of 9 pin have high voltage. But when switch the door any one open the circuit exceed time delay keep 5 pin of IC NE556 have low voltage to fully drive transistor circuit give relay work. The system will order to give the horn a car talks at one time to come to immediately. But if we shut the door a car or close S1 system stop work again.

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PWM DC Motor Speed Control with NE556,LM311

The left half of the 556 dual timer IC is used as a fixed frequency square wave oscillator. The oscillator signal is fed into the right half of the 556 which is configured as a variable pulse width one-shot monostable multivibrator (pulse stretcher). The output of the one-shot is a variable width square wave pulse, the pulse width is set with the speed control pot on the control voltage input. The variable width output pulse switches the IRF521 MOSFET transistor on and off. The MOSFET amplifies the current of this signal so that it is powerful enough to control a small DC motor. The 311 comparator is used to cut off the one-shot via the reset pin when the control voltage is below a certain threshold, the 311 is also controlled by the speed control pot. The cut off circuit is necessary because the 556 one-shot circuit will always put out a small pulse, even when the control voltage is at zero.
Read more Source:http://www.solorb.com/elect/pwm/pwm0/

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Two-Stage Timer By IC Dual Timer 556

Two-Stage Timer By IC Dual Timer NE556
This be Two-Stage Timer Circuit by IC Dual Timer NE556. Which 2 Timer both of build be One Shot. By wasp Trigger pin with GND. Timer1 work send pulse come out. enough be finished pulse. The this Timer2 as a result continue working replace. By the value Time bilateral control with R1,C1 and R4,C6