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Looking for a UL approved device that gives +9V and -9V from the 120VAC wall. I need the +/-9V to power a circuit and I don't want to make an extra PCB. My alternative is to have two 9V wall warts but who wants to plug things in twice? What happens when the end user loses one of the chargers?

EDIT: where can I buy one? I need to pull at least 2A from either side

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  • \$\begingroup\$ yes, it is available ... keep looking ... your last two questions are not answerable and also pointless \$\endgroup\$
    – jsotola
    Commented Sep 29, 2020 at 16:50
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    \$\begingroup\$ Use an 18V wall wart or even a 19V laptop PSU and make a virtual 0V halfway between its supply rails. \$\endgroup\$
    – user16324
    Commented Sep 29, 2020 at 16:59
  • \$\begingroup\$ I have a wall-wart (that I bought surplus for $1) that supplies +/- 12 VDC and +/- 5 VDC. (Actually, I bought up 5 of them. They used a nice big transformer.) Biggest "wall-wart" I ever did see! \$\endgroup\$
    – jonk
    Commented Sep 29, 2020 at 16:59
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    \$\begingroup\$ You could make +/-9 from the more common +/-12v power supplies using some cheap linear regulators. Would also be beneficial for reducing noise. \$\endgroup\$
    – user1850479
    Commented Sep 29, 2020 at 17:25
  • \$\begingroup\$ @user1850479 Thank you for your suggestion. I do have linear regulators somewhere down stream, I just wanted the raw +/- supplies without having two physical devices to plug in to the wall. \$\endgroup\$
    – Josh Girgis
    Commented Sep 29, 2020 at 17:29

2 Answers 2

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There probably is, but the way bipolar rails are done in most situations is an AC step down transformer, then you rectify it on the board and regulate it. (but that requires an extra board). There are plenty of power supplies that output ±9V available.

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Thank you all for your suggestions, I just found one GP50A13D-R1B

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    \$\begingroup\$ I am glad you told me what I didn't know that I didn't know. The one you found is good because (1) it is a wall wart and therefore spacing saving, (2) no need to plug twice, therefore less trouble making and shooting. (3) The MW US is a very good brand. I am a huge friend of it. \$\endgroup\$
    – tlfong01
    Commented Oct 2, 2020 at 2:03

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