5V Switching Regulator, Very Simple Circuit

Switching Regulator for High Power Efficiency When you should regulate a high voltage to a much lower voltage, switching regulator must be the only choice. Fortunately,  a simple switcher integrated circuit chip is available, let you build a complete step-down switching regulator using five components. The switching regulator IC used in this circuit  is LM2575 series like we use in […]

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Crystal Tester

Quartz crystal tester is needed if you want to know whether the crystal is good or bad (broken).  This crystal tester gives LED light indicator. If the crystal under test is good, the LED indicator will light, and stay off if bad. The circuit is simple and easy to build, here is the schematic diagram: This crystal tester circuit use […]

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