[E3-hacking] Line level conversion

David Given e3-hacking@earth.li
Mon, 14 Mar 2005 15:13:45 +0000

I'm now the proud owner of a MAX232CPE, and hopefully I should be able
to breadboard up a line level converter tonight. Then we'll discover
whether I've fried my UART by plugging it directly into an RS232 port.

I can't seem to find, however, any consistency in the circuits I'm
supposed to use. The datasheet's standard circuit uses 1=C2=B5F capacitors;
Maplin's circuit in the catalogue uses 22=C2=B5F; the circuit here:


...uses 0.1=C2=B5F. Hardware's not my strong point. Can anyone clarify? How
critical are these sizes?

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