Replacement Part needed

Discussion in 'The Projects Forum' started by Jassper, Nov 30, 2008.

  1. Jassper

    Thread Starter Active Member

    Sep 24, 2008
    I am currently using the 16 pin dip version of the ST232. All I use this for is the voltage doubler section that gives me a +10 volt and -10 volt output. I am currently using a 7805 5v regulator to power the chip.

    I am looking to replace the ST232, due to space constraints I need something that requires few support components. I have looked at a few doublers but it requires one for the + side and one for the - side and takes up just as much space.

    Can anyone recommend something?

    I am also open to suggestion on replacing the 7805, as I don't need a 1 amp supply 300 to 500 ma would be sufficient. Would a 5v Zener give me suitable regulation to power the ST232 or it's replacement?

    Input voltage is 11 to 14.5 volts

    I have looked at the surface mount versions of both the ST and the 7805, however the footprint for the 7805 takes just as much space as the TO-220 does. The ST I think is workable.
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    The regulator could be an LM317 set to make the 10 volts, but no space saving. You might be able to get a ICL7660 charge pump to make the -10, but it needs 2 tantalum caps plus it's in a DIP 8 package. And it's only good for 10 ma or so. The 300 - 400 ma needs a regulator in a larger package than TO-92.

    Have you considered placing the power supply off the board so you only need a 3 pin connector?
  3. Jassper

    Thread Starter Active Member

    Sep 24, 2008
    Thanks for the suggestions, I'll have a look.