It is quite versatile, can accept voltages up to 35V, and I have some in the drawer. Here is the data sheet: LM7805.pdf. Following this it occurred to me that it would be nice to not have to worry about the type of current from the plug pack – AC or DC. So my circuit needs a bridge rectifier. That can be made with four 1N4004 diodes. [RICOH ELECTRONIC DEVICES Official Website] The R5527 Series are CMOS-based battery power line switch IC. The Due to a soft start function, The R5527 can prevent an inrush current at startup. Therefore, the R5527 is the optimal as power supply switch of the battery power line switch for hand-held communication equipment. FLS0116 — MOSFET Integrated Smart LED Lamp Driver IC with PFC Function Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. LM78XX LINEAR INTEGRATED CIRCUIT 1 DESCRIPTION The Contek78XX family is monolithic fixed voltage regulator integrated circuit. They are suitable for applications that required supply current up to 1 A. FEATURES *Output current up to 1.5 A *Fixed output voltage of 5V, 6V, 8V, 9V, 10V, 12V, 15V ,18V and 24V available *Thermal overload shutdown ... power OFF. IC breakdown may cause injury, smoke or ignition. Use a stable power supply with ICs with built-in protection functions. If the power supply is unstable, the protection function may not operate, causing IC breakdown. IC breakdown may cause injury, smoke or ignition.  Do not insert devices in the wrong orientation or incorrectly.