Single Cell LED Flashlight

This is Single Cell LED Flashlight circuit. This circuit uses white LED that has best power-efficiency combination at about 20mA and requires abut 3.3V. Each Led in this circuit draws power about 66mW. This circuit uses seven LEDs. This circuit very useful for a tiny pocket flashlight because the whole array of leds run at close to one half watt. […]

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Low-Dropout (LDO) Voltage Regulator

This is a Low-dropout (LDO) Regulator circuit, constructed by using only a single PNP transistor. This circuit is directly related to load current. At very low values of load current as little as 50 mV. This circuit has maximum specified dropout voltage about 0.7V to 0.8V at full current and typical values around 0.6V. Compared with the other regulator types, […]

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