Re: [CAD_CAM_EDM_DRO] 3.3v to 5v Parallel Port conversion

Jay:

I assume you have a source for +5VDC, and know which is "ground", and such
IMPORTANT trivia. Now all you need is a 74HCT541 octal buffer. That is an
18-pin 5V IC which will happily take inputs as low as 2.4 VDC, and just as happily
output probably at least 4.75 VDC, if your supply is 5.0 VDC, into a 300 ohm
load. It might be ideal for you to add eight 10K resistors, one to each
input, tying the other ends together to Vcc, to insure that IC's inputs never
"float" (BAD for CMOS stuff, particulary up in the dry, cold winters!)

If you are not into making your own "special" PCB's, Radio Shack sells some
nifty small stuff which have solder-pads which make cobbling "made-up"
breadboards for such as this reasonably
straightforward.

Have fun, and work carefully, and it will work if you don't klutz somewhere!
Jan Rowland


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