Door open alarm using IC 555
Most of us are held up with our busy life, be it at office or at home.Often due to our workload and carelessness we tend to forget to close the doors in our office or at home.This habit…
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Circuit diagrams and Schematic designs
Overvoltage protection circuit
Power supplies are critical for most of the products/gadgets.If we didn't consider the power supply part while designing our circuit, it can sometimes lead to catastrophic failure and we don't want that.This is especially true when you are…
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Metal detector circuit using inductive proximity sensor
Metal detectors are used to unearth or spot metal objects from various surfaces.Popularly these type of circuit uses Inductors and its inductive property to sense metal detection.However in this circuit we are using a dedicated proximity inductive sensor…
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Touch activated office call bell circuit
Many of us are familiar with traditional office call bell that is used to alert assistants or other colleagues.It doesn't have to this boring setup.Here is a simple circuit that can be used as an alternative to this…
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+5V and -5V power supply circuit using 7805 and 7905
Linear voltage regulators are most popular due to their low price point and availability.78xx is a popular series of linear voltage regulators that's available for various output voltage ranges such as 5V, 6V,9V, 12V and so on.But there…
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118博金宝
Beat frequency indicator circuit
Beat frequency indicators are used to indicate whenever frequency of a signal of our interest exceeds reference frequency.This is one such indicator circuit which uses LED's to indicate when our signal exceeds the reference frequency.These indicator circuits can…
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