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Article #19288Re: 7805 regulator
From: Dale Wlasitz
Date: Thu, 16 Jun 1988 17:57
Date: Thu, 16 Jun 1988 17:57
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>If you have problems with oscillations you can put a few 10's pf >capacitance between the base and collector of the PNP. Invert this >circuit for a negative supply booster. You WILL have problems with oscillations, add 47 pfd's across input to output of the regulator. As a side note...input filtering capacitors can go as large as you like, however do not increase the output capacitance more than 100 uFd's as the cap looks like a short circuit on power up and will nuke the regulator. 8-) Dale
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arc1-ca.pugleaf.net!utzoo!attcan!uunet!husc6!bloom-beacon!tut.cis.ohio-state.edu!osu-cis!att!alberta!calgary!amc-vlsi!daleShow Full Headers
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Path: arc1-ca.pugleaf.net!utzoo!attcan!uunet!husc6!bloom-beacon!tut.cis.ohio-state.edu!osu-cis!att!alberta!calgary!amc-vlsi!dale From: dale@amc-vlsi.UUCP (Dale Wlasitz) Newsgroups: sci.electronics Subject: Re: 7805 regulator Message-ID: <524@amc-vlsi.UUCP> Date: 16 Jun 88 17:57:22 GMT Organization: Alberta Microelectronic Centre, Calgary, AB. Lines: 13