|
|
This project is about making a battery backup circuit for Raspberry Pi computer and prevent any abrupt shutdown during power failure. It also allows to safely turn the device off if the main power supply doesn’t come back after a preset time interval (controlled through software). The battery switches to automatic charging mode during the normal operation.
Read more
This DIY USB travel charger is powered by two NiMH rechargeable batteries in series (2.4V DC) and uses the LT1302-5 DC-to-DC booster to derive +5V, 500mA output. The output is accessible through an USB port so that mobile devices can be simply plugged in for charging.
Read more
All embedded systems require electric power to operate. Most of the electronic components inside them, including the processors, can operate at a wide range of supply voltage. For example, the operating voltage range for the PIC16F1847 microcontroller is 2 to 5.5 V. But there are certain applications where you need a regulated constant voltage to avoid malfunctioning of the circuit or getting erroneous results. For instance, any application that involves analog-to-digital conversion (ADC) requires a fixed reference voltage to provide accurate digital count for input analog signal. If the reference voltage is not stable, the ADC output is meaningless. Here
Read more
One important parameter in embedded system designing is power consumption. This parameter is directly related to the battery lifetime, if the system is to be powered from a battery. In order to determine the power rating of your designed system, you need to know how much current the system draws from the source at a given voltage. While working on my projects, I usually measure current by placing an external ammeter in series with the current’s return path. This is not always convenient to do, and so I thought of making a special power supply unit for my lab that
Read more
This project describes a home made power supply for a small server computer. It uses a toroidal power transformer (not the conventional transformer) to step down the mains AC voltage. The advantages of using a Toroidal is it is quiet, efficient and smaller in size. The transformer output is then rectified and capacitive filtered. DC regulation is achieved using PTN78020 for the 12v supply, and PTN78000 for the 5V one.
Read more|
|