On Monday 01 July 2013 12:56:14 john d norton did opine: > Does the pic parra port have any pull downs as I've knocked up a > circuit to step up the 5 volt signal to 24 via a udn2389 and can > measure a stray voltage at the low volt side but this is direct into > the para port with no brake out so could the noise be there > Most parport hardware is basically a TTL driver, and a logic 0 would probably have around .05 to .1 volts of residual voltage there, so yes there would be a bit of what you are calling noise there. Enough to run the udn2389 would be stretching the point. Functioning as a charge pump, with external power to run the pump circuitry, it might be able to source .5 volts at very low current.
However, in order to brace up my opinion, (I am a C.E.T.) I did a google search for udn2389 integrated circuit, and came up totally empty. Would you like to refine this part number for us? > ------------------------------------------------------------------------ > ------ This SF.net email is sponsored by Windows: > > Build for Windows Store. > > http://p.sf.net/sfu/windows-dev2dev > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> > I'm an idiot.. At least this [bug] took about 5 minutes to find.. Disquieting ... -- Gonzalo Tornaria in response to Linus Torvalds's A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------------------------------------------------------ This SF.net email is sponsored by Windows: Build for Windows Store. http://p.sf.net/sfu/windows-dev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
