On Fri, 28 Dec 2001, Keith Christopher wrote:

>    I appreciate your input 1st and foremost. I am new
> to designing circuits, and was looking to see if there
> is a general rule of thumb. What I am looking to do is
> get input from one serial (232) input and using an AND
> gate switch between two outputs using a PIC to set the
> second input of the gate high (the 232 input on the
> other.) I know I cannot simply wire them straight
> together, I will need some resistance and capacitance
> somewhere, I was trying to figure out where without
> having someone else answer the question for me.

Well, if you convert the RS232 levels to TTL/CMOS with a line receiver
first, yes you can connect things directly without resistors or
capacitors.  Hence my love of digital circuits!  8-)

> Also LED get REALLY REALLY bright before they blow.
> 8-)

Ah, so you have discovered Noise Emitting Diodes?  Just like an LED, but
used to indicate a high current condition.  Emits a loud SNAP sound
(once).

Dale

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