[TriEmbed] Protection from Dual 12V inputs

Sat Mar 12 07:53:33 CST 2016

Here's another idea which uses 7400/4011. Keep in mind that outputs are
inverted.

[image: Inline image 1]

On Sat, Mar 12, 2016 at 8:42 AM, Robert Gasiorowski <rgresume at gmail.com>
wrote:

> Below is a better drawing of my circuit.
>
> If you want to get fancy, you could use configurable gate, like 74LVC1G58
> (you would need one for each channel.)
> Use A as input, B permanently high, C opposite input.
>
>
>
> [image: Inline image 1]
>
> On Fri, Mar 11, 2016 at 10:16 PM, Pete Soper via TriEmbed <
> triembed at triembed.org> wrote:
>
>> Hi Brian,
>>
>> (Here's your original msg
>> <http://mail.triembed.org/pipermail/triembed_triembed.org/2016-February/002402.html>
>> for others to catch up on if they're interested. I should also point out
>> that folks can set their mail to "digest mode" and get a single msg a day
>> if this spurt of traffic gets too bad. One person unsubscribed yesterday.)
>>
>>   As one relative beginner to another, let me ask what's between the
>> level translator and your relays? You sort of imply below you might be
>> expecting the level translator to deliver a ton of current despite it going
>> through the 470 ohm resistor (limit with 5v source is about 10ma). It's
>> hard to picture the level translator operating even the most puny relay.
>>   But Robert's circuit is predicated on the MOSFET gate needing very
>> little current (i.e. with 5v out of the level translator about 10ma). The
>> other transistor has to be able to yank the gate on the other side of one
>> of these resistors to ground, so making them too small defeats the
>> either/or aspect.
>>   But it really needs resistors in the path from each level translator to
>> the transistor base Rob accidently connected it directly to. Without those
>> it's a survival duel between too high current through the level translator
>> or the transistor base to emitter path and one or both parts may be
>> destroyed instantly or at some random, inconvenient time. The base
>> resistors could be a few k ohms and even the crummiest transistors would
>> sink the 10ma to prevent the MOSFET connected to its collector from
>> switching on (the 470 ohm resistor is kind of like a bus pullup in this
>> situation).
>>   Now that we're up to two transistors and four resistors, a single
>> 74LV04 (Mouser part 771-LV04N112) seems attractive.  One of it's
>> inverters could feed a complement of a single MCP23008 line to one
>> relay(driver?) and the original signal would drive the other one.  But this
>> LV chip is wimpy. For more drive the 74AHC04 would work as below. Or you
>> could use the LV04 in between the MCP and the level shifter (i.e. sticking
>> with something you know is working now).
>>
>> -Pete
>>
>>
>> On 03/11/2016 02:24 PM, Grawburg via TriEmbed wrote:
>>
>> I've tried this and it doesn't work.  I did change the resistors to 220
>> just to see if that made a difference.
>> My actual set-up does not use MOSFETs as I originally asked about but
>> instead uses two DPDT relays.
>> The input voltage goes through a level shifter since I determined that
>> the 3V3 through the resistor was too close to
>> the 2V5 that produces an unknown state in the relay modules. So the
>> output from the shifter is 5V which does work fine. I still need to
>> be able to make sure a bad code doesn't allow both relays to activate.
>>
>>
>> Brian Grawburg
>>
>> ------------------------------
>> -----Original Message-----
>> From: "Robert Gasiorowski" <rgresume at gmail.com> <rgresume at gmail.com>
>> To: "Grawburg" <grawburg at myglnc.com> <grawburg at myglnc.com>
>> Cc: "Triangle Embedded Devices" <TriEmbed at triembed.org>
>> <TriEmbed at triembed.org>
>> Date: 02/24/16 05:34 PM
>> Subject: Re: [TriEmbed] Protection from Dual 12V inputs
>>
>> Ooops, forgot to add base resistors.
>>
>> On Wed, Feb 24, 2016 at 5:23 PM, Robert Gasiorowski <rgresume at gmail.com>
>> wrote:
>>
>>> How about something simple like this:
>>>
>>> [image: Inline image 1]
>>>
>>>
>>>
>>>
>>
>> --
>>
>> *[This was sent from a PC running Debian 7, 64-bit Linux. No Microsoft
>> products were used.] *
>>
>>
>> _______________________________________________
>> Triangle, NC Embedded Computing mailing listTriEmbed at triembed.orghttp://mail.triembed.org/mailman/listinfo/triembed_triembed.org
>> TriEmbed web site: http://TriEmbed.org
>>
>>
>>
>> _______________________________________________
>> Triangle, NC Embedded Computing mailing list
>> TriEmbed at triembed.org
>> http://mail.triembed.org/mailman/listinfo/triembed_triembed.org
>> TriEmbed web site: http://TriEmbed.org
>>
>>
>
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