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Groups > sci.electronics.design > #454489
| From | rickman <gnuarm@gmail.com> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: Simple Low Voltage Shut Down |
| Date | 2017-03-31 18:03 -0400 |
| Organization | A noiseless patient Spider |
| Message-ID | <obmjib$f0c$3@dont-email.me> (permalink) |
| References | <Nl2DA.428151$fZ.218528@fx41.am4> <obisol016pi@drn.newsguy.com> <dbzDA.285202$2K7.267822@fx18.am4> |
On 3/31/2017 4:42 PM, Robert Miller wrote: > On 30/03/17 23:13, Winfield Hill wrote: >> Robert Miller wrote... >>> >>> I have a little circuit consisting of an LM358 and >>> BC547 emitter follower. It runs off 4 x AAA alkaline >>> batteries and consumes about 50mA. >>> >>> What is the simplest way, without consuming additional >>> power, of disabling the output from the LM358 when >>> the battery voltage drops below around 4V? >> >> . >> . --+-----E C---- >> . | B >> . 6.2k | ZTX718 >> . | 470 >> . | | >> . | K >> . +-----R TL431 >> . | A $0.40 >> . 10k | >> . | | >> . --+-------+------ >> >> > > That's a neat little circuit, but I was hoping for something passive. > > Maybe a dumb question, but, given the low current, would it be possible > to power the amp through a zener diode? What would that accomplish other than losing a lot of power and voltage to the amp? -- Rick C
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Simple Low Voltage Shut Down Robert Miller <robert.miller@teledyne.com> - 2017-03-30 18:21 +1100
Re: Simple Low Voltage Shut Down Winfield Hill <hill@rowland.harvard.edu> - 2017-03-30 05:13 -0700
Re: Simple Low Voltage Shut Down Winfield Hill <hill@rowland.harvard.edu> - 2017-03-30 10:20 -0700
Re: Simple Low Voltage Shut Down Tim Wescott <seemywebsite@myfooter.really> - 2017-03-30 14:39 -0500
Re: Simple Low Voltage Shut Down Robert Miller <robert.miller@teledyne.com> - 2017-04-01 07:42 +1100
Re: Simple Low Voltage Shut Down rickman <gnuarm@gmail.com> - 2017-03-31 18:03 -0400
Re: Simple Low Voltage Shut Down Robert Miller <robert.miller@teledyne.com> - 2017-04-01 10:35 +1100
Re: Simple Low Voltage Shut Down rickman <gnuarm@gmail.com> - 2017-03-31 19:49 -0400
Re: Simple Low Voltage Shut Down Winfield Hill <hill@rowland.harvard.edu> - 2017-03-31 17:56 -0700
Re: Simple Low Voltage Shut Down Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2017-04-01 11:17 -0400
Re: Simple Low Voltage Shut Down John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-30 07:14 -0700
Re: Simple Low Voltage Shut Down Tim Wescott <tim@seemywebsite.com> - 2017-03-30 12:19 -0500
Re: Simple Low Voltage Shut Down Winfield Hill <hill@rowland.harvard.edu> - 2017-03-30 13:18 -0700
Re: Simple Low Voltage Shut Down Tim Wescott <seemywebsite@myfooter.really> - 2017-03-30 15:52 -0500
Re: Simple Low Voltage Shut Down Winfield Hill <hill@rowland.harvard.edu> - 2017-03-30 14:31 -0700
Re: Simple Low Voltage Shut Down mike <ham789@netzero.net> - 2017-03-30 15:02 -0700
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