Home Made Power Supply. Home Utility Circuit 27

This Homemade Power supply is useful for the Electronics hobbyists and service persons to test and troubleshoot the circuits. It gives six stage well regulated output power with a current of 800 mA. Its construction is “Open type” as it is home made. You can make it like a professional power supply by fixing inside a box with connectors for tapping the output.

Bread board power supply. Home Utility Circuit.16

This Project is for the Circuit designers. Lot of projects are experimented in Bread board and Perf boards before finalising the project. So these projects need a power supply to test. Usually a 9V PP3 battery is used to power the bread board. So here is a compact Portable Power supply unit for the Bread board experiments. The Power supply includes
1. A charger indicator for the 9V rechargeable battery
2. A battery voltage monitor
3. Output sockets for charging and tapping power to bread board.
4. An LED light for the bread board working

Over Voltage Protector. Simple Design 9

This is one simplest form of Over voltage Protector for the Bread board power supply. Usually we use 12 volt DC power supply to power the bread board. If the CMOS devices are used in circuit assembly, over voltage can damge them permanatly. This circuit limits the voltage to the bread board to 12 volts. If the voltage increases above 12 volts due to a high voltage surge in the AC lines ,the circuit cut off the power to the bread board. It can also be used in any device like Chargers that works on 12 volt DC .

Portable Power supply. Design Note 44

Hacked my Laptop battery and charger to make a Portable power supply. My old Laptop was irreparably damaged leaving only a good battery. It is a high performance 12 volt Lithium Ion rechargeable battery that can backup more than 2 hours a laptop and many hours for circuit boards and LED lights. So I made a Portable power supply using the battery. So don’t discard the battery and charger if your Laptop fails permanently. Both battery and the charger costs around Rs. 2000.It can be utilized for making a Power supply or LED lamp. So it is the  good power supply I ever made because it is running on battery and output is fully regulated.

Power Supply for Projects. Design Note 43

For bread board assembly of Micro controller and Arduino projects ,we need  well regulated  5 V and 3.3 V DC power supply. Here is the simple but efficient regulated power supply that gives four stage power outputs  – 12 V unregulated, 9 V, 5 V and 3.3 V regulated DC .