Circuit Project Electronic

My cousin want buy IC dc converter,I like IC from www.linear.com because good ic,low cost and easy to used.
He are want 3V to 12V DC converter or switching power supply(switching-regulator).
Here is a DC converter Input 3V to output 12V,for electronics circuit.
The important part of the circuit is IC LT1073-12 again.
12V OUTPUT
35mA AT
VBATTERY = 2V
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Laboratory Power Supply - Variable voltage from 0V to 50V and variable current from 0A to 1A
Reverse engineered circuit diagram of an expensive commercial variable lab power supply. This unit is designed around an ordinary op-amp and easy to obtain parts. Although the unit uses a single transformer with two output windings the circuit works [...]

The IRISMPS5 is an open frame 90W Flyback power supply unit (psu) using the IRIS4015 Integrated switcher. This demo board aims to show the capability of the IRIS4015 to handle the upper level of flyback topology power range, without the strict standby power requirement.
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