Circuit Project Electronic

When batteries are used to power lower voltage circuits, a switching regulator is desirable to conserve battery life. There are excellent ICs that can do the job with great efficiency and small size. An example is the Maxim (www.maximic.com) MAX639 which converts inputs from 5.5 to 11.5 volts to 5 volts at up to 225mA. The only additional parts are an inductor, schottky rectifier and a couple of capacitors. The following circuit is a discrete switcher similar in power handling capability to the MAX639. The performance is somewhat inferior to the IC switchers but suitable components can be found in most junk boxes.

Click to View circuit

Related Links
More Kit about 5V switching power supply
More Kit about switching power supply Kit
More circuit about dc to dc converter
More circuit about dc converter step down voltage
More circuit about 5V power supply
7805+Mj2955 power supply 5V 5A for digital circuit.
LM2577 5V to 12V DC Converter step up Voltage Regulator
5V to +12V/-12V DC Converter by LM2577
Switching power supply dual voltage 5v and 3.3v by LM2575 LM1117
Regulator 5V 3A by IC LA5105
ICL7660 DC to DC Converter input 5V to output +/-5V
5V 5A switching regulator for digital by LM2678
5v Regulated Solar Power Supply Circuit