12V Switching Car PSU by UC3843
The power supply accepts 8 to 16 volts and produces 12 volts. The topology is SEPIC (single-ended primary inductance converter), the advantage being the ability to convert up or down with a minimum of parts and maximum efficiency. [...] the power supply is good for about 8 amps output and can power the system while starting the car.
The UC3843 chip is very common and made by many manufacturers using slightly different numbering systems. It comes in an 8 pin DIP package, but I only had 14 pin SOP versions so I used a DIP header and hacked it in. Three type of protection are incorporated in the design. First is a 6 amp
Read More Source: http://dion.swamp.dk/carpower.html
Thank you.
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PC 12-V Adapter
This circuit can replace small mains adapters in the vicinity of the computer. This is particularly handy for devices that need a 12-V supply, such as active PC loudspeakers. The necessary 12-V supply voltage is taken directly from the PC power supply. In order to protect the PC supply against possible short circuits, and especially to prevent the PC from being crashed, a current limiting circuit is connected in series with the 12-V supply.
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Read More Source:
http://www.elektor.com/magazines/2000/july/pc-12-v-adapter.56431.lynkx
Thank you.
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Inverter 100W 12VDC to 220V by IC 4047 – IRF540
This is inverter 100W circuit, use IC 4047 alike inverter 100W transistor I use Mosfet IRF540 instead Transistor 2N3055.
It good Idae, power output 100W from transformer 2-3A.
Read detail more in circuit.
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