Hi,
I have some designs for an 20mA current loop i/f that we use on some
of our products, however these are designed for TTL i/f as they are
internal.
Now I need to make an external version, my questions are:
Are there any designs available on the net ?
Are there any 'driver chips' available ?


I need to cater for both active and passive loops.

Thanks in advance.

/Tony

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