Ton Giesberts
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Ultra-low-power 5 V regulator

Ultra-low-power 5 V regulator
The current drain of the regulator is minute compared with that of, say, a 78L05: at an input voltage of 9 V and open-circuit output, it is just under 50 µA. The circuit consists of a straightforward bandgap reference based on T1 and IC1, followed by an amplifier formed by IC2 and T1.
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