Author Topic: negative voltage from 2 buffered sources?  (Read 2256 times)

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Offline blackbeardTopic starter

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negative voltage from 2 buffered sources?
« on: January 06, 2010, 02:22:16 PM »
i need to supply an op amp with +5v and -5v. if i have a single power source (i.e. a 9v battery) and 2 7805 voltage regulators would they be enough of a buffer to be used in the same circuit you would normally use with 2 9v batteries? (see the video below thoughtfully created by afroman).

Operational Amplifier Tutorial & super microphone circuit
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Offline Soeren

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Re: negative voltage from 2 buffered sources?
« Reply #1 on: January 06, 2010, 03:53:41 PM »
Hi,

Quote from: blackbeard on January 06, 2010, 02:22:16 PM
i need to supply an op amp with +5v and -5v. if i have a single power source (i.e. a 9v battery) and 2 7805 voltage regulators would they be enough of a buffer to be used in the same circuit you would normally use with 2 9v batteries?
No, the 7805 needs 8V in and even if you discard that bit of info, 5+5 is usually 10 ;)

If you just wanna make a mic-amp., then you can just use the 9V and create an artificial ground (2 resistors and 2 caps should do in a nick).
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