Injector & Coil Driver Board Group Buy

[Bill Shaw]

> Since several people expressed an interest in this,  I obtained permission to re-post this message on GMECM.  Please direct any responses to David at the address at  the end of this message.
>
> Bill
>
> >From efi332 digest last week:
>
> ------------------------------
>
> Date: Mon, 11 Sep 2000 15:48:35 -0500
> From: David Rhoads II <rhoads at adi.com>
> Subject: Combo driver "official" group buy
>
> This is a repost (with minor corrections) of the lost message I sent to the group last Saturday (9/9/00).
>
>  Well folks,
>
>  I believe that I am now at a point where I can say the combo driver board  design is finished.
>
>  I would like to now offer an "official group buy" for this combo driver board.
>
> All of the individuals that have stated an interest in obtaining a driver board will be contacted off list for verification.  Those that wanted a saturated driver board or one of Sandy's P&H driver boards will be asked if they would like to convert over
> to this new combo design.
>
> The following files have been uploaded to the incoming directory;
> ftp://ftp.diy-efi.org/incoming/combodrvrBOM3.xls
> ftp://ftp.diy-efi.org/incoming/combodrvrImages.zip
> ftp://ftp.diy-efi.org/incoming/combodrvrDataSheets.zip
>
>  I will not be doing a group buy for my saturated driver design. However, I  will offer a parts & hardware buy for those holding bare P&H driver boards  designed by Sandy Ganz.  More info on that in a separate message.
>
>  This zip files also contain a README.txt which I will quote at the end of  this message.
>
>  Sending my parts list / BOM to one of the distributors (Wyle electronics) to  see if they could beat the prices I already had, resulted in savings of about  $20.  Several iterations of my own through various distributors have resulted in  another $30 in
> cost reduction from my original totals.  For a detailed cost  break down, see the BOM spreadsheet.  The price of the PCB includes the  prototype cost of the 1st board distributed across the quantities listed in the  spreadsheet.
>
>  Here is the condensed version of the pricing;
>  Combo driver PCB and PCB parts (8 P&H Inj, 8 Sat Coil drivers)   $ 110.78
>  Case (the one on the efi-332 hdwe pg)                            $  14.84
>  PCB assembly                                                     $  15.00
>  Connector punching, heat sink drilling, case drilling, mounting  $  15.00
>  Extra harness side connector set for bench test                  $   5.13
>
>  "The Works" (fully populated for a V8)                           $ 160.75
>
>  You can request the number of drivers in pairs, 2, 4, 6, or 8 injector drivers, and 2, 4, 6, or 8 coil drivers.  Your price will be adjusted accordingly.  This works out to about $5.36 for a pair of injector drivers and about $4.86 for a pair of coil
> drivers.
>
>  For the most part, the prices in the spreadsheet are based on a minimum quantity of 25.  As the number of participants in the group buy push beyond that count, the prices will begin to drop.
>
>  The prices do not reflect parts shipping costs to me, any taxes on the parts, or final shipping cost to you.  When the group buy is closed, final shipping costs will be determined and probably rounded up to cover packaging. There is no set open time for
> the group buy at this time.  I would like to keep it down to about 4 weeks but that may exclude infrequent readers of the list.  We'll play that by ear.
>
>  Now the contents of the README.txt file contained in the zip files.
>  """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
>
>  About this zip file;
>
>  README.txt      This file written on 9/8/2000.
>
>  These files can be found at ftp://ftp.diy-efi.org/incoming/combodrvrDataSheets.zip
>
> 452_453.pdf          P&H injector driver datasheet
> HarrisIGBT2.pdf      Saturated coil driver datasheet
> LM2940.pdf           Voltage regualtor datasheet
> MM74HC540.pdf        Inverting(540) & non-Inverting(541) buffer datasheet
> sda24.pdf            Clamping diode array datasheet
>
> These files can be found at ftp://ftp.diy-efi.org/incoming/combodrvrImages.zip
>
> Combo1.pdf           PCB image including top, bottom, heatsinks,
> and dimensions.
> Combo1tp.pdf         PCB image of top side.
> Combo1bt.pdf         PCB image of bottom side.
> Combo1sc.pdf         Schematic image.
>
> The detailed Parts list & Bill of Materials file can be found at ftp://ftp.diy-efi.org/incoming/combodrvrBOM3.xls
>
> combodrvrBOM3.xls A detailed Bill Of Materials for the combo driver board.
>
> This combo driver board design is intended for Non-Commercial use only by members of the efi-332 group and any affiliated groups.
>
>  It allows up to 8 Peak & Hold injector drivers and up to 8 saturated coil drivers.
>
>  There is no warranty / guarantee of any kind for this board.  If you use it incorrectly, it becomes your door stop, not mine.
>
>  ********************** Critical - Read this section! ****************************
>
>  The two mounting holes at the right end of the board, the end with larger signal return connectors, serve as the high current ground (PwrGND). At least one of these must be used to provide a ground return for the drivers.  If not used, the drivers will
> not work! If you don't use them the drivers theoretically could arc across to the signal ground plane on the board and kill it in a hurry. I suggest using something similar to the braided ground strap that can sometimes be found between the hood and
> firewall of your car.  Connect one end to the standoff screw(s) on the outside of the case and the other end to your engine block.
>
>  I do not recommend mounting the driver box directly to the engine or near any other high heat source.
>
>  ^^^^^^^^^^^^^^^^^^^^^ Critical - Read this section! ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
>  All of the input signals can be configured for "active high" or "active low"  triggering.  Sockets are used to allow future configuration changes. For normal "active high" operation, use the SIP resistors in the RN2/4 position and use the MM74HC541
> non-inverting buffer.  For "active low" operation, use the SIP resistors in the RN1/3 positions and use the MM74HC540 inverting buffer.
>
>  This box will also allow you to convert existing saturated injector drivers in an OEM ECU to Peak & Hold injector drivers.  This is done via the current limiting resistor array (RP1) and the clamping diode array (DA1).  You must configure the injector
> inputs for "active low" use.
>  """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
>
>  End of the README.txt file.
>
>  I think I've covered it all.
>
>  Any constructive input is welcome.
>
>  I'm subscribed in digest mode, but to avoid clogging my inbox at work, private responses should be sent to my home e-mail address of drhoads2 at aol.com

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