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An inverter provides power backup for mains-based appliances in the event of a power failure. Most of the inverters available in the market have complicated circuit designs and are not very economical. Some of them produce a square-wave output,...
We have heard of events/parties going out of control due to gate crashing by uninvited guests. Now, as a solution, imagine your door counting the number of invitees and raising an alarm when the number exceeds the guest list....
Here’s a simple FM receiver with minimum components for local FM reception.
A smart TV generally costs more than a normal TV. Curved LED TV is even more expensive with a price range of around 30k to 40k (Indian rupees). And curved LED monitors are available in 15K to 30K (Indian...
We often store important and confidential files in pen drives or flash storage drives for transferring/sharing data. Although convenient, there remains a concern regarding misplacing these storage devices that can go into wrong hands and create problems. So we...
This controller circuit based on an infrared (IR) object sensor (Sharp 2Y0A21) is used for saving power of the mirror light near a washbasin. The circuit contains manual on and off switches and an additional automatic switching system. Circuit and...
Use of brushless DC motors (BLDCs) is on the rise. But their control usually requires rotor position information for selecting the appropriate commutation angle. Normally, a Hall Effect sensor is used to sense rotor position. But in cost sensitive...
This portable solar-powered lantern with auto bedlight for everyday use can be made with easily available components. The circuit diagram of the portable solar lantern cum bedlight is shown in Fig. 1. It is built around a 5.5V, 60mA solar...
This project describes how to connect a web camera to the Raspberry Pi and make use of it. Raspberry Pi board has an onboard connector which can be used for connecting the camera directly. Connect the camera very carefully,...
Here we put all the theory to work and present a simple 1.5W power amplifier module that can be easily built with readily available components. The block diagram of the amplifier is shown in Fig. 1. It is typical...
 
 

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