LM2577 6V to 12V 1A simple step-up dc converter

This step-up converter is intended for use in a '67 Citroen 2CV. This car, and I use the word loosely, has a 6V battery and won't support a modern radio that needs 12V. The circuit described here converts 6V to 12V at 1A sustained load current.

To implement this, I have used the LM2577T-ADJ from National Semiconductor. It operates conform the given discription and is connected like so:

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Source: www.xs4all.nl/~odu/
Thank you.