Circuit Project Electronic

Here is the switching regulator 12V,so input 5V to output 12V at 0.13A.
It is Step-Up DC Converter by IC LT1073-12 Micropower DC/DC Converter.
I very like IC by http://www.linear.com because it is very small size and good ic.
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This is a circuit 3V to 15V Step-Up DC Converter by LT1073.
It is very nice IC Dc converter or Switching power supply.
15V OUTPUT
27mA AT
VBATTERY = 2V
Please read detail more on image circuit.
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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
Detail more, [...]