Bill of Materials - Digi-Key Order Form

MegaSquirt Hardware Version 2.2

This is the MegaSquirt V2.2 ordering form for Digi-Key. It is based on the official MegaSquirt BOM, and will allow you to assemble the MegaSquirt with just a printed circuit board (PCB) or a 'partial kit' (from the second group buy) and case. Thanks to Scott Campbell, Ira Emus, and Dan Houlster for comments and suggestions on components and Eric Fahlgren and Perry Harrington for the Javascript and other great ideas. Note that some additional parts will be required, as noted near the bottom of the form.

If the default quantities are used, the price for a 'PCB kit' should be $80.62, and a 'partial kit' should be $47.91, as of January 2003.

Quantities are as required for MegaSquirt, except where minimum quantities are required.(Note: the calculated total on this form may be higher than Digi-Key indicates because depending on your order size you get some quantity discounts).

Before beginning, you should click the clear button below. This will clear any open orders with Digikey.

To order complete the following four steps:

  1. If you have purchased a "partial kit(s)" from the group buy, you already have the Motorola processor, MAP sensor and FET driver (U1, U3 and U7, respectively, from the list below). Specify whether you are purchasing components for partial kits from the group buy or all of the components for the bare PCB board:

    Select the type of MegaSquirt
    kit(s) you need parts for:
    partial kits ($47.91 each)
    PCB board-only ($80.62 each)

  2. Choose the number of kits you want parts for:
    I want parts for MegaSquirt kit(s).

    Verify that you have the quantities you want for each item below. You can change them to the numbers you want.

  3. Then send your order to Digi-Key:

  4. You will be redirected to Digi-Key to verify your order, payment method, and shipping details. The order will not be complete until you have finished this step. You can redo your order by returning to this page at any time before finalizing your details with Digi-Key.
    Note: If you get an error for the first item, simply click on the 'Add List to Order' button on the Digi-Key site, and the item will be added.

Here are the other parts you'll need to build your MegaSquirt: Some MegaSquirt Related Links: Printed Circuit Board (PCB) - group buy

LMB EAS-300 case - you can purchase the case from HdB Electronics (650-368-1388) in single unit quantities. Your choice of natural aluminum or black anodized. This is where the Group Buy orders for the case were placed.
Or you can get the EAS-300 Enclosure [style 4006 - 4.124" x 1.582" x 6" w/ heavy radiused (H) ends] at: http://enclosuresandcases.com/splitbodyspecpage.html
You might also try Fry's, they have one that measured 6 x 4.17 x 1.56. It costs $15.95.

Nylon Screws - 4/40 - P/N H550-ND - 0.0926ea. You need 6, but there is a 100 minimum from Digi-Key - try locally.

Nylon Nuts - 4/40 - P/N H616-ND - 0.105ea. You need 6, but there is a 100 minimum from Digi-Key - try locally.

LED mounting clips - P/N 4304MC-ND - 0.08ea. You need 3, but there is a 100 minimum from Digi-Key - try locally.

Don't forget that you will need a Willette Programmer to program your blank processor if you haven't purchased it from Bowling and Grippo.

MegaSquirt Site

MegaSquirt Yahoo! Site

MegaSquirt FAQ

Notes:

* D1, D2, D3, D4, D8 - The 5.1v Zener diodes are optional since the Motorola processor has overvoltage protection on the analog inputs. Diodes D1 to D4 are not installed - do not place jumpers in their place, just leave these locations open. The processor provides sufficient input protection, these diode are not needed. Once again, do not jumper these locations, just leave them alone - put nothing there. For most installations, diode D8 is not needed. The diode is needed if the ignition system has a large offset bias - most systems do not have such a bias. So, to start, you can either solder in a jumper wire in this location, or, you can install the diode D8, and then install a jumper around the two leads of the diode - in effect shorting it out. The latter will allow you to snip the jumper later on if needed, putting the diode back in circuit.

** Q3, Q5, Q9, Q10, Q11 - The PN2222A will work as a drop-in replacement for the 2N2222A. The package is different (TO-92) such that the leads are in-lined, but it is in the "E-B-C" order just like the 2N2222A. For the metal-can 2N2222A, if you hold the device, looking from the top, with the tab pointing towards the 2:00 position on the clock, the emitter is at 12:00, the base is at 9:00, and the collector is at 6:00. For the PN2222A, if you hold the flat side facing west (or 9:00 on the clock), looking from the top again, the emitter is on the top or 12:00 position, the base is in the center, and the collector is down at 6:00. Simply bend out the center lead towards the flat side (towards the 9:00 position) and the part will drop right in the hole.

*** Q1 - TIP32C is an approved substitute for TIP42 - see http://www.bgsoflex.com/msflyback.html. If you want a TIP42 TO-220, it is P/N 18C8753 ($0.76) at Newark Electronics, also stocked by retail electronics shops like RadioShack.

**** U7 - IXDI404PI-ND is a replacement for MC33151P FET driver - 8 Pin DIP. If you prefer the MC33151, you can order samples at: http://www.onsemi.com/productSummary/0,4317,MC33151,00.html

Click here to go back to the MegaSquirt FAQ
Comment, corrections or suggestions for the form? E-mail Lance Gardiner.