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Article #11918Can I use 1 power supply instead of 2 9-volt batteries?
From: Thomas David Kehoe
Date: Thu, 15 Oct 1992 18:03
Date: Thu, 15 Oct 1992 18:03
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1256 bytes
My op-amp prototype uses two 9-volt batteries, to supply +9 volts, -9 volts, and ground. It requires new batteries after 5-10 hours of use, and I have a 9-volt power supply (that plugs into the wall). Replacing the +9 volts battery with the power supply will be easy. Is there an easy way to replace the -9 volt battery? Would an inverting op-amp do this? That would be easy. The alternative is to use op-amps that just require +9 volts and ground. I could so this too. -- "Why my thoughts are my own, when they are in, but when they are out they are another's." - Susannah Martin, hanged for witchcraft, 1692. Thomas David Kehoe kehoe@netcom.com (408) 354-5926
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arc1-ca.pugleaf.net!sparky!uunet!portal!lll-winken!elroy.jpl.nasa.gov!sdd.hp.com!caen!sol.ctr.columbia.edu!The-Star.honeywell.com!umn.edu!csus.edu!netcom.com!kehoeReferences:
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Path: arc1-ca.pugleaf.net!sparky!uunet!portal!lll-winken!elroy.jpl.nasa.gov!sdd.hp.com!caen!sol.ctr.columbia.edu!The-Star.honeywell.com!umn.edu!csus.edu!netcom.com!kehoe From: kehoe@netcom.com (Thomas David Kehoe) Newsgroups: sci.electronics Subject: Can I use 1 power supply instead of 2 9-volt batteries? Keywords: cable, RF, A/V Message-ID: <1992Oct15.180350.23610@netcom.com> Date: 15 Oct 92 18:03:50 GMT References: <1992Oct15.133811.7126@cbfsb.cb.att.com> Distribution: na Organization: Netcom - Online Communication Services (408 241-9760 guest) Lines: 14