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An Alarm Power Supply With Battery Back-up - This Power Supply is suitable for
the Modular Burglar Alarm. However, it has other applications. It is designed to
provide an output of 12-volts, with a current of up to 1-amp. In the event of
mains failure, the back-up battery takes over automatically. When the mains is
restored, the battery recharges. (circuit design added 04/05/06)
Build a UPS for USB devices - 04/11/02 EDN-Design Ideas: Portable systems
often include circuitry that derives power from an external source, such as USB.
When system disconnects from USB supply, a battery takes over and
supplies current via a dc/dc converter. A diode-OR connection (Figure 1)offers
easiest way to ensure that supply voltage doesn't sag during this switchover
to battery.....(design idea added 1/05)
Build a USB based GPIB Controller - 12/16/05 EDN-Design Ideas: Roll-your-own
USB-based instrumentation bus.....(design idea added 11/06)
MOSFET Circuit Ups Regulator's Output Current - 02/01/96 EDN-Design Ideas -
Use a current mirror and a power MOSFET to increase the output-current capability
of an IC-voltage regulator .....(design idea added 6/06)
Uninterruptable Power Supply (Andy Collinson) - This circuit is a simple form of
the commercial UPS, the circuit provides a constant regulated 5 Volt output and an
unregulated 12 Volt supply. In the event of electrical supply line failure the battery
takes over, with no spikes on the regulated supply....(electronic design added 6/07)
Uninterruptible Power Supply - (application / block diagram added 6/07) In
common Off-line UPS, the power is derived directly from the power line and picked from
the battery when the line fails. Then the battery powered inverter turns on to provide
with the AC output. A battery charger....
Variable Power Supply Using Fixed Regulator - This is a similar power supply that
I used to power my FM Transmitter. After suffering long problems with mains hum, this
design using a pi filtered C-L-C approach. This circuit offers excellent ripple
rejection...(electronic design added 6/07)
