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Groups > sci.electronics.design > #454248
| From | Winfield Hill <hill@rowland.harvard.edu> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: Simple Low Voltage Shut Down |
| Date | 2017-03-30 10:20 -0700 |
| Organization | Rowland Institute |
| Message-ID | <objepm0280f@drn.newsguy.com> (permalink) |
| References | <Nl2DA.428151$fZ.218528@fx41.am4> <obisol016pi@drn.newsguy.com> |
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 |
>. | |
>. --+-------+------
A little hysteresis would be good.
. 4.0-volt low-V shutoff.
.
. ZTX718
. --+-----E C-----+----
. | B |
. 6.8k | 120k
. | 470 5% hyst
. | | |
. +------ | -|<|--'
. | K
. +-----R TL431
. | A $0.40
. 10k |
. | |
. --+-------+------
Omit the diode, if a little OFF leakage
from 127k of resistance can be tolerated.
--
Thanks,
- Win
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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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