• Power-On Delay Timer Circuit Full DIY Electronics Project

     · Circuit diagram of power-on delay timer circuit is shown in Fig. 3. It is built around a timer NE555 (IC1) decade counter 4017B (IC2) optotriac MOC3041 (IC3) triac BT139 (TRIAC1) a 100-kilo-ohm preset (VR1) and a few other components. Fig. 3 Circuit

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    2 days ago · This is just a LED lamp circuit that can be operated from the mains voltage. A string of five LED is driven using a capacitive transformer less power supply. In the circuit 0.47uF/400V Polyester capacitor C1 reduces the mains voltage. R1 is a bleeder resistor which drains the stored charge from C1 when the AC input is switched OFF.

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  • Timer Circuits and ProjectsElectroSchematics

    This time delay relay circuit is built with IC NE/SE555 produced by Intersil which contains a precision timer. Door Timer Circuit with Alarm T.K. Hareendran08/13/2010

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  • 1 Minute 5 Minute 10 Minute and 15 Minute Timer Circuit

    2 days ago · It means for some time output pin 3 is HIGH and for some time it remains LOW that will create a oscillating output. We can use this property of 555 timer to create various timer circuits like 1 minute timer circuit 5 minute timer circuit 10 minute timer circuit 15 minute timer circuit

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     · An easy way to set up such a monitoring system is to have the computer regularly energize and de-energize the coil of a watchdog timer relay (similar to the output of the "recycle" timer). If the computer execution halts for any reason the signal it outputs to the watchdog relay coil will stop cycling and freeze in one or the other state.

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  • A simple LED lamp circuit from scrap. Uses 5 LED and takes

    2 days ago · This is just a LED lamp circuit that can be operated from the mains voltage. A string of five LED is driven using a capacitive transformer less power supply. In the circuit 0.47uF/400V Polyester capacitor C1 reduces the mains voltage. R1 is a bleeder resistor which drains the stored charge from C1 when the AC input is switched OFF.

  • 1001 Free Electronics Projects Ideas for Engineers

    Get tested electronics engineering project ideas embedded electronics projects and mini projects for electronics enthusiasts at Electronics For You.

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    This circuit is designed with a basic astable-multivibrator designed with an IC 555 timer. A resistance probe is placed on a position where the alarm is turned ON once the water level increase to the set level. This circuit uses fewer components it can be simply connected on a printed circuit board. Alarm Circuit for Fire with Low Cost

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