This circuit is a battery eliminator 1.5 V, that is, a power supply of 1.5 volts, low consumption that takes as input the output of the USB PC or notebook. The power adapter is simple, it converts the voltage from 5V to 1.5V USB ports, using the popular LM317 IC and a few other components. To be exact this circuit uses only three components, one is the LM317, R1 = R2 = 470 ohm and 100 ohm.
Eliminator 1.5 Volt battery using LM317 Circuit Diagram
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