I have an audio mixer which can run on two 9V batteries in series. I'd like to run it off a single 12V supply.

  • Can I use two 12V-9V DC-DC converters both running off a 12V battery?
  • Will the connection to the 12V battery short the 9V series connection?

The mixer is a Behringer 1002b, the AC input adapter is 16V and 3V.

When I test with batteries I get 18V across the power switch

  • \$\begingroup\$ You haven't supplied enough information. (1) Are the batteries arranged as an 18 V battery pack or is there a wire from the centre to give +9 / -9 V supply? (2) Is there an AC adaptor input and, if so, what is the voltage specification? (3) Does the mixer have a name, model and a user manual that you can link to? Please edit to include all the information in your question (and not in the comments). \$\endgroup\$ – Transistor Oct 9 at 23:50
  • \$\begingroup\$ It's highly likely that this uses two batteries to crudely achieve positive and negative suppliers for older op-amps. You cannot use non-isolated converters running from the same supply for this. There are positive to negative converters however. \$\endgroup\$ – Chris Stratton Oct 10 at 2:16
  • \$\begingroup\$ Whatever you try to do is likely more expensive then getting the ac adapter. Are you trying to make this portable? From what type of battery (car/bike/etc?) \$\endgroup\$ – Passerby Oct 10 at 7:28
  • \$\begingroup\$ I have ac adaptor, mixer is new. I'm wanting to extend usable time ( currently 4 hrs on battery) 12v battery maybe 7Ah \$\endgroup\$ – Ken Mackay Oct 10 at 8:07
  • 1
    \$\begingroup\$ You've linked to an ad page for the mixer. We need the user manual. \$\endgroup\$ – Transistor Oct 10 at 9:22

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