On Wed, 17 Aug 2005, William Chops Westfield wrote:

>
> On Aug 17, 2005, at 2:08 PM, James Newton, Host wrote:
>
>>> How about a serial line booster ?
>> 
>> http://www.piclist.com/techref/io/serial/RCL1.htm ?
>> 
> No, we'd want an rs232 (+/- 3V) to rs232 (+/-12V) converter,
> which lacks the inversion part of a ttl to rs232 converter.
>
>> A small box using just level translators and a wall wart ?
>> 
> Alas, +/-12V makes for a relatively complex wall-wart or
> post-WW power supply...

Hmm, I use the voltage doubler approach for the wall warts (internal 
modification or output ac and double on the board). A honest 12V wall 
wart will make +/-14V unloaded.

Peter
-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist