Re: TVS as *input* clamping?

On Wed, 28 Jan 1998 15:09:30 -0800, Clay Cowgill <ClayC@diamondmm.com> wrote:

>Dunno if anyone suggested this yet or not, but as I was staring at the
>"input protection board" on a 314 deflection board in my vector monitor
>during lunch...
>
>Couldn't you just use bidirectional TVS' (at, say... 10V for "X" and
>8.2V for "Y") across ground and the inputs? So if an op-amp failed and
>yanked the output the +/- rail the TVS would clamp it?

Wouldn't that be the same as back to back zeners? I've seen that used quite a
bit as input clamps. Does the input daughter board on the Sega system contain
back to back zeners? Seems like it did.

(Isn't a bidirectional TVS, internally, really just two zeners back to back?)

-Zonn

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Received on Wed Jan 28 16:02:39 1998