Electronics

LED Driver using 7805 and LM317

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LED Driver using 7805 The 7805 can be converted into a content-current device by connecting a resistor as shown below.   As the 12v rises from 0v, the 7805 starts to work and when the input voltage is 4v, the output is 1v as a minimum of 3v is lost across the 7805. The voltage rises […]

Electronics

White LED on 1.5 v Supply

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In this post you will find circuit on how we can light up white LED on 1.5 v supply. Heart of the circuit is the transformer winded on 2.5mm by 0.5 mm core using 0.095 mm wire. 2 White LED on 1.5 v Supply The circuit below uses only 1.5v to light up 2 white […]