>> There are ways to design around this problem, but the only reliable
>> way is to use a higher-rated device and/or a lower rail voltage.
>.......or to clamp the shunt side of the series resistor with a large
>zener with a capacitor across. You can use a zener clamp rated
>below the maximum voltage breakdown of the shunt device, and
>above the highest desired regulated voltage.
>This actually is a good idea in ANY case, because the shunt diode
>with protect the screen system if the main regulator goes on
// Why not use a simple zener-string shunt regulator and obviate the
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
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