This is circuit Linear power supply Regulator,
Use IC LM317 ( hot ic regulator) it Adjustable Voltage Output.
Control By Selector SW, so Output Voltage 1.5V , 3V,4.5V,5V,6V,9V and 1.5A All Volt out.

Voltage Inverter, +5 to +/-5V, Input Voltage 1.5-10V, or Voltage Doubler to 18.6V
ICL7660 Features

* Simple Conversion of +5V Logic Supply to +/-5V Supplies
* Simple Voltage Multiplication (VOUT= (-) nVIN)
* Typical Open Circuit Voltage Conversion Efficiency 99.9%
* Typical Power Efficiency 98%
* Wide Operating Voltage Range
o ICL7660 1.5V to 10.0V
o ICL7660A 1.5V to 12.0V
* ICL7660A 100% Tested at 3V
* Easy to Use – Requires Only 2 External Non-Critical Passive Components
* No External Diode Over Full Temp. and Voltage Range

Source : http://www.ortodoxism.ro
Please Read More Datashee: http://www.ortodoxism.ro/datasheets/intersil/fn3072.pdf