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Schematic review

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bryan

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Hello:

Was going to build up this RS232 isolator to alleviate some ground loop issues and wondering if anybody can see and flaws or problems with the authors design.

**broken link removed**
 
Depending on what you are connecting to "K2", there could be a problem in that the signal levels at that port are not RS232 but TTL.
If you need true RS232 levels at K2, you would be advised to use a MAX232 or similar between K2 and U3 (or possibly instead of U3).

JimB
 
The schematic is not a full insulated RS232 circuit. To break the ground loop, usually you need a fully optoinsulated circuit.

Take a look here: **broken link removed**
 
K2 is connected to a serial port of a aquarium controller. Cracking the box of this controller and the serial port is driven by a maxim232 -->microcontroller.

Computer-->DIY Opto Isolator-->maxim232-->microcontroller


Depending on what you are connecting to "K2", there could be a problem in that the signal levels at that port are not RS232 but TTL.
If you need true RS232 levels at K2, you would be advised to use a MAX232 or similar between K2 and U3 (or possibly instead of U3).

JimB
 
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