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Isolated current loop receiver

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Shouldn't be difficult. I did one back in 1979 at Chessell Recorders.

It was good to 14-bits, once we got hold of a polypropylene part for the in tegrating capacitor. Of course it was quad-slope, rather than dual slope.

The bit I was pleased with was the output isolating transformer, which was just a ferrite toroid, held down on the board by six U-shaped bits of insul ated wire, which were the windings (plus some printed circuit track). It ha d very little inductance, but produced a big enough (and sufficiently long sustained) inductive spike to switch half an LM393 through the couple of mV hysteresis I'd designed in - more than the worst case input offset voltage ).

We did have a separate isolated power supply for the floating analog bits.

--
Bill Sloman, Sydney
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Bill Sloman
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That can be code for "Well, we'll give it a shot and when things hit the fan we'll call". Then, the phone rings ... :-)

--
Regards, Joerg 

http://www.analogconsultants.com/
Reply to
Joerg

No, that's code for, "We'll take a shot at that, and blame you when we don't succeed" >:-} ...Jim Thompson

--
| James E.Thompson                                 |    mens     | 
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Jim Thompson

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