Free Simple Circuit Diagram
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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LED flasher circuit can be built based on 555 IC. Using 555 IC, the flashing rate can be more flexible to adjust. This LED flasher circuit is similar to our transistor flasher circuit, but the flashing period of both LEDs won’t be same. The flashing frequency is determined by C1, R1, and R2. You can try values around 100k for […]
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This simple LED flasher circuit will turn ON and OFF two LED alternatively. The first LED will turn ON when the second LED is OFF for some period, then the first led will turn OFF and the second LED will turn OFF. This cycle will be repeated as long as the battery is connected to the circuit. This LED flasher […]
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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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