[Diy_efi] need schematic critique

[Mike]

A simple PNP driver would do the trick, no inversion...

email if you want a sketch,

rgds

mike


At 09:20 AM 16/2/2003 -0500, you wrote:
>Needs work....
>
>- LM339 does not have drive output capable of sinking enough current for a
>relay drive, and it's an open collector output device so can only sink
>current, not drive current into the relay..
>- So you need a driver stage after the LM339, and possibly an inversion of
>the logic.
>
>Didn't look at the ref schematic yet. You can write me at mbalntel at cfw.com
>
>Mark Bowers
>
>
>----- Original Message -----
From: Toyota Supra <turbosupramk3 at hotmail.com>
>To: <diy_efi at diy-efi.org>
>Sent: Sunday, February 16, 2003 6:50 PM
>Subject: [Diy_efi] need schematic critique
>
>
>> hi all,
>>
>> i need a schematic critique on the schematic housed below, it is in .jpg
>> format or .psd
>>
>> http://68.7.7.84:8080/schematics/
>>
>> i have included the psd in case someone wanted to edit it to something
>> better
>>
>> specifics on it are as follows :
>>
>> variable resistor input, ranging from 0 to 3.5vDC
>> circuit is to kill signal to normally open relay at 3.2vDC
>> i would like approximately a tenth of a volt of hysteresis
>>
>>
>> below is a link that i would like to use to control the reference voltage
>> for pin 4 of the LM339 chip, will it work?
>>
>> http://www.mitedu.freeserve.co.uk/Circuits/Power/lm317.htm
>>
>>
>> thanks to all that look at this
>>
>> -j
>>
>>
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>
>
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