6V to 12V DC Voltage Converter

This is the active circuit for voltage doubling from 6 volt to 12 volt DC. The IC is used as switcher device.
Schematic diagram:

Free schematic

Components and its usage

IC Switcher/regulator LM2577T-ADJ (National Semiconductor)
R1 and R2 Voltage devider for monitoring output voltage 20Kohms pot. (Bourns)
Cin Decoupling 0.1΅F, 63V MKS condensator (WIMA)
L Use a good quality coil! 160΅H toroοd (2.5A, 70mohms, nickel-iron core)
D Current higher than output current! FR603 60V reverse breakdown, 3A Schottky-diode
Rc and Cc Pole-zero compensation network 2200ohms, 5% and 1΅F, 63V elco (Philips)
Cout Get a low ESR type! 2200΅F, 16V elco (Telecon)

PCB layout:

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