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Looking for a circuit to do a RS-485 receiver with Op-Amp

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MrEd

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RS-485 with OP-Amp???

Anyone seen a circuit of to do a "dirty" but cheap RS-485 receiver with an OP-Amp? Need it for a cheap quick test of balanced data lines.

MrEd
 

Standart RS485 transmiter/receiver(75176, 26LS32) costs about $0.25.
I dont see need to search for cheeper solution.
 

Any other solution will be more expensive, and much more complicated as you need more then a few OP amps
to create a RS485 driver. Chech the data sheet of the 75176.

David
 

It needs to work below 3V and be cheap. The normal low voltage drivers seems quite expensive in comparison to the 5V versions.

Price is the big issue in this app.

MrEd
 

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