EE question: convert RS232 voltages to RC servo

[Ether]

Originally Posted by EricVanWyk

Another option is to put the diode antiparallel across the LED. ... The advantage is that it is easy to prove from the datasheets that everything will be ok.

That's kind of what I had in mind when I drew Figure C for post #3.

Hugh mentioned in an earlier post that the Victor requires about twice as much input current as the Jag. So make the Vic 6ma. Divide that into 12 volts to get approx 2000 ohms for the resistor in Figure C.

Other than mail order and Radio Shack, are there any other places any more that might carry small electronic parts like resistors and diodes? For example, would RC hobby stores carry stuff like that?

I used to have drawers full of parts, collected from old radios and TVs and hi fi equipment I disassembled. Somewhere along life's road and many moves they got lost or discarded.