Regulator and Power Suply Circuit

Power Filter/Regulator Circuit

Although normal car battery voltage is understood to be 12V, in fact it has fairly large fluctuations. It's settled around 12V when engine is off, but if you start engine, it drops down to 6-8V, due to the huge load of engine cranking. When engine is running, the voltage becomes about 14V to charge battery, but with noise from alternator, and from other electrical loads, including motors (both alternator and motors are inductive). Such dirty voltage must be dangerous thing to hook up to a computer. I found on the web that a guy is running his EPIA from car power directly. Alghough it worked fine when I directly plugged power to EPIA from cigarette lighter socket, it would be broken if I continued to do so.

6 Amp 12V Solar Power Regulator

The SPC2 is a solar power center, it can be used to handle all of the power functions for small 12 Volt solar powered devices. It contains a photovoltaic charge controller and a low voltage load disconnect circuit. The low voltage disconnect has a load on-off switch, and a battery low voltage indicator. By using the SPC2 as the center of a solar powered device, long battery life is assured. The SPC2 can be used for powered lighting systems, radios, and other 12 Volt devices.

1A 0-30 Volt Power Supply

The linear power supply, shown in the schematic, provides 0-30 volts, at 1 amp, maximum, using a discrete transistor regulator with op-amp feedback to control the output voltage. The supply was constructed in 1975 and has a constant current mode that is used to recharge batteries.

Extend Current 7812 regulator circuit

Using a single 7812 IC voltage regulator and multiple outboard pass transistors, this power supply can deliver output load currents of up to 30 amps.

Noise Reduction for the MAX1864 Auxiliary Regulator

The MAX1864 is a low-cost, multiple-output converter consisting of a switching buck circuit and two positive linear regulators. Although this IC's basic application circuit offers a low-cost, multiple-output supply, applications where lower noise is desired can benefit from this application note. This application note details the design and implementation of noise reduction for the MAX1864 auxiliary linear regulator.

12V Alarm Power Supply

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.

Extend current lm78xx regulator circuit

They are intended as fixed voltage regulators in a wide
range of applications including local (on-card) regulation for
elimination of noise and distribution problems associated
with single-point regulation. In addition to use as fixed voltage
regulators, these devices can be used with external
components to obtain adjustable output voltages and currents.

5 Volt regulated with Overvoltage Protection

The 5 volt regulated power supply for TTL and 74LS series integrated circuits, has to be very precise and tolerant of voltage transients. These IC's are easily damaged by short voltage spikes. A fuse will blow when its current rating is exceeded, but requires several hundred milliseconds to respond. This circuit will react in a few microseconds, triggered when the output voltage exceeds the limit of the zener diode.

Battery Charger Circuit

This note aims at introducing the different features of the ST6 Realizer graphic tool. It is also a tutorial to firstly help you get started with ST6 Realizer design, then for you to implement advanced features to optimize your design or to evaluate the target hardware requirements.The application note describes

a battery charger because it illustrates the different features of the ST6 Realizer throughout it. The charger implements a simple charging method.Nevertheless charging end points using the negative voltage slope detection method or voltage inflection points can be implemented with this battery charger ST6 board.