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This Time Delay circuit is useful to switch on an AC load such as lamps after the delay of three minutes. This protects the load from inrush current and transients at power on which may be detrimental to the device.
This circuit lights the backyard of your home at 10 pm and stays on till morning. It helps to provide light in the back yard to avoid nocturnal animals and even prevents an attempt of theft. It is fully automatic and uses an LDR as light sensitive switch.
This flashing light circuit uses triacs to generate an intermittent light with variable frequency. Additional components are the D1 diode and semi adjustable potentiometer R2. The trigger capacitor C1 is increased from 0.1 µF to 220 µF so that the triacs can be ordered for several successive periods. C1′s loading time is longer, so that the lamp flashes with one pause of several periods.
Modern power control systems utilize electronic devices like Thyristors for power switching, phase control, chopper etc. These devices also find applications in inverter design, brilliance control in lamps, speed control of motors etc.
Optimizing the Triacs
D.MOHAN KUMAR
