power supply (UPS)
to operate 12V, 9V and 5V
DC-powered instruments at up to 1A
current. The backup battery takes up
the load without spikes or delay when
the mains power gets interrupted. It
can also be used as a workbench power
supply that provides 12V, 9V and 5V
operating voltages. The circuit immediately
disconnects the load when
the battery voltage reduces to 10.5V to
prevent deep discharge of the battery.
LED1 indication is provided to show
the full charge voltage level of the battery.
miniature white LEDs (LED2 and
LED3) are used as emergency lamps
during power failure at night.
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