Inrush Current Limiter Circuit

A 7805 can be configured as a constant-current regulator, to serve as an inrush current limiter. Rl will have 5 V across it at all times so the total current through 11 will be 5 V/R1 + 5 mA, the 5 mA being the regulator operating current.
Inrush Current Limiter Circuit - schematic

In This ease, R{ = 5 V/95 mA = 52.6 for II current = 100 mA.

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