> -----Original Message-----
> From: Roman Black [SMTP:fastvid@EZY.NET.AU]
> Sent: Friday, January 26, 2001 10:04 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [EE:] Shunt regulator? 317/337 solution
>
>
> As I said, a shunt regulator needs positive feedback,
> ie; if voltage is too high, must turn on more.
> The actual inversion is provided by the nature
> of it being a shunt reg.
>
> I really don't think you can do it with a 317,
> but I already posted a one transistor solution that
> I have used for years that is cheaper and just
> as simple. You are not going to get short circuit
> protection from a shunt reg anyway so the extra
> cost of a regulator chip is not justified. :o)
>
> -Roman
>
Agreed, even the safe operating area protection that most 3 terminal
regulators empliy is wasted, if the device overheats it will stop conducting
and the voltage to your device will soar, probably toasting it.

Mike

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