A good start point for d2 and Big Disk Range v.2 Lacie power supply info and reviews for d2 and Big Disk Range v.2. Lacie is well known for their External hard drives, external, raid and network hard drive and therefore sometimes we need to buy a power supply.
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This simple TTL power supply monitor circuit monitors the 5-volt level TTL power line and gives a signal whether the supply voltage is outside or within the necessary range or “window”. The heart of the power supply monitor is a low-current integrated window comparator. The center of this window is set at 2.5 volt +/- 0.005 volt by the bandgap reference diode D1 which is connected to pin 2 of LTC1042. The width of this window must be 20% (+/- 10%) of the reference voltage.
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This is a regulated and adjustable power supply which can deliver up to 20A and adjustable voltage between 4 and 30V. It is easy to build and uses LM338 and 741 integrated circuits. VR1 it is used to adjust the output voltage. Use very good heatsinks for LM338 and BD140 transistor. The transformer secondary must deliver 18 volts a.c.
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The new Revolution85+ power supplies from Enermax were designed to deliver clean, stable outputs with high efficiency and minimal noise. The Revolution 85+ series comes in four different wattages: 850W, 950W, 1050W, and 1250W – although the last will only be available for 230VAC.
Revolution85+ power supplies are some of the first to be certified under the new 80 Plus Silver classification to be at least 85% efficient at 20% and 100% of the rated output and at least 88% efficient at 50% of the rated output power. continue reading…

4 simple 12Vdc power supply circuits with output voltages around 12V. First power supply circuit is built with BD139, one zener diode and a few passive components. Each of the schematic is very simple to construct and will function without problems if you respect the maximum power supply ratings. continue reading…