Possibly a linear regulator (does the device get warmer than you'd expect?) Although the LM7805 would need ~7V minimum RE those chips: almost all general purp

Possibly a linear regulator (does the device get warmer than you'd expect?) Although the LM7805 would need ~7V minimum RE those chips: almost all general purpose components have a usable voltage range. From LEDs to MCUs, most components can tolerate a few hundred millivolts from its ideal V_{f}, some even dozens of volts - especially solid state stuff like CMOS ICs The only time I really recommend not f*cking with aftermarket PSUs is if it's primarily charging or powering: - lithium batteries - super or ultra capacitors