Confuse the burglars with this Mock alarm. It gives an impression that the Home is guarded with a highly sophisticated Security system. The Front panel of the unit fixed in the gate pillar gives that impression, but inside it, there nothing except a flashing circuit. The system automatically becomes active at night and stays on till morning. So no switch is needed. I have fixed it in my gate and many people asked me about its cost and I simply told it is a high cost one.
This is one of my most attracted Circuit published in Electronics for You Magazine September 2008 issue. The circuit is doing a great job. It automatically cut off the Fridge during the Peak hours from 6 pm to 9 pm saving lot of energy and money. After the peak hours, the Fridge will turn on automatically. Try it and avoid the task of manually switching off the Fridge every day during peak hours.
Make this simple Electronic Mail Box and impress your friends. It gives beeps when a letter is placed in the letter box and intimates the arrival of Mail. The circuit is too simple and uses an LDR as dark sensor and White LED as illuminator.
Some Microcontroller based Laboratory instruments such as Digital balance, pH Meter etc have rechargeable battery inside. This inbuilt battery should be properly charged for the error free operation of these instruments. If the instrument is not using (or charging) for long time, its inbuilt battery will be destroyed permanently. This timer circuit helps to keep the battery in top condition through automatic charging for 5 to 6 hours daily so that the instrument can be left unattended. The battery will be charged only during the day time.
Continue reading “Timer for Charger”
You can use this Simple Alarm to protect the door or Window. It gives a loud beep and switch on the room light when an intruder attempts to breaks the door lock. The alarm functions only after 5 minutes to confuse the intruder.
Continue reading “Simple Door Alarm”
You can fix this circuit in the switch board that provides power to the loads such as Water heater, Electric Iron etc to remind you that the load is switched on. LED blinks indicating the load on status and the buzzer beeps every 30 minutes. This helps to prevent the wastage of energy usually happens when we forget to switch off these devices. This can be also used to remind, if remote lights such a terrace light is switched on unnoticed.
Continue reading “Timely Beeper”
This simple circuit can monitor the heat generating devices like Amplifier, CD player, Inverter etc. The LED in the circuit blinks when the heat inside the device increases above the preset value. To give more visual attraction, a seven segment display is also included which shows a digital display as the temperature increases.