Posted on Jul 21, 2012

This RS-232 type line receiver to drive CMOS logic uses a Schmitt-trigger feedback network to ~give about 1-V input hysteresis for added noise immunity. A possible problem in an interface which connects two pieces of equipment, each plugged into a different ac receptacle, is that the power line voltage might appear at the receiver input when the interface connection is made or broken.

Click here to download the full size of the above Circuit.

The two diodes and a 3-W input resistor will protect the inputs under these conditions.

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