[Diy_efi] schematic critique

[Bill Washington]

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J,
    Perhaps my suggestions weren't very clear, so I'll try to clarify:

1. The diode you have added is connected back to front. (Diode =>  ANODE 
-|>|- CATHODE)
2. the Collector of the transistor should go to +8 or +12 V supply 
depending on the relay's coil voltage, not to the + input of the Opamp!
3. change R5 to 1k Ohm
4. delete C3, Opamp inputs must not be capacitively coupled,
5. With the above changes, the circuit will work opposite to description 
IE #1>~#2 => #3 = 8V..... #1<~#2 => #3 = 0V
6. R3 adds hysteresis, therefore the switching point will not be when #1=#2.
7. Delete R4, it serves no purpose.

If #2 is directly connected to U1 pin 4, #3 will switch to 8V when #1 
rises above 3.232Vand remain there until #1 drops below 3.152V, at which 
time #3 will switch back to 0V.

I hope this helps.
Regards
Bill




> Date: Mon, 17 Feb 2003 21:51:01 -0500 From: "Toyota Supra" 
> <turbosupramk3 at hotmail.com> To: diy_efi at diy-efi.org Subject: Re: 
> [Diy_efi] schematic critique (???) Message-ID: 
> <BAY2-F166I063RA5C2d00030b5c at hotmail.com> Content-Type: text/plain; 
> format=flowed MIME-Version: 1.0 Precedence: list Reply-To: List for 
> general do-it-yourself EFI talk <diy_efi at diy-efi.org> Message: 7 hey 
> bill, i have modified the circuit per your and some others advice, i 
> must say that i am thoroughly confused now with the different versions 
> that it has went through, so i am relying that this will function, 
> else i won't know which values to alter ??? :) here is the latest 
> photoshopped schematic, version 3.0 
> http://68.7.7.84:8080/schematics/schematic3.psd 
> http://68.7.7.84:8080/schematics/schematic3.jpg are the values and 
> placements of the components on par as well? lmk, thanks for the help 
> all -j
>
>>>Fro
>>


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