DIY WBO2 construction

[Steve.Flanagan at VerizonWireless.com]

Kao,

One thing I noticed was that you need to put D6,Q3 and D7,Q4 in thermal
contact.  This means you need to mount the diodes about 1/4 inch elevated,
and then bend the transistors (Q3,Q4) and the diodes (D6,D7) until they
touch.  Q3 should touch D6, Q4 should touch D7, you can use heat sink
compound to make sure you have good thermal contact.

There was a note on the schematic that mentioned this.


B.    Item 3 is a 25uf 25v capacitor, however the one sent to me was a 22uf
25v, can it be used it instead?  THIS IS FINE

C.    Item 15 is a LM386Z-1.2 transistor, however, the one sent to me was a
LM285Z-1.2, will that pose a problem?  SHOULD BE FINE, HOWEVER, WHY NOT TAKE
A LOOK AT THE DATASHEET THAT DESCRIBES THESE DEVICES AND DO A COMPARISON.
DATASHEETS CAN BE FOUND AT DIGIKEY.

Anyone care to answer his other q's below.

SF

-----Original Message-----
From: Crescent Kao [mailto:crescent at c-speedracing.com]
Sent: Tuesday, January 08, 2002 9:14 PM
To: diy_efi at diy-efi.org
Subject: DIY WBO2 construction




Hello everyone,
  This is my first public email to everyone on this list. I would like to
take this opportunity to thank all of you for providing a great resource for
the DIY community. I've been following the WB02 for the past year or so and
I've finally received and built the first kit from the last group buy. I'm
looking forward to using it, however I have a few questions regarding the
construction and certain parts that were specified on the parts list versus
the parts that were actually sent to me.

I've attached a pic of the board I just finished (not sure if they will
attach on the mailing list but you can view them here), my concern is the
following:

http://www.c-speedracing.com/temppics/diy_wbo2/dsc00031.jpg
http://www.c-speedracing.com/temppics/diy_wbo2/dsc00032.jpg


 Item  Quantity  Reference                 Part            
----------------------------------------------------------------------------
---
    1       3    C1,C3,C4              10uf 25v 
    2       2    C2,C8                   0.1uf 25v   
    3       1    C5                        25uf 25V  
    4       2    C6,C16                 10uf 15V 
    6       3    C9,C13,C14           0.1uf 12v
  15       1    D8                        LM385Z-1.2  


A.    You'll notice on the PCB that at C2,  0.1uf 25v disc was used (item
2), however at position C8,  0.1uf 12v was used (item 6). Only one (Item 2)
0.1uf 25v disc was sent to me, however four (item 6) 0.1uf 12v were sent but
only 3 are specified from the parts list, so there was one left over which I
assumed would be used to replace C8. Will this work? Or do I need replace C8
with a 0.1uf 25v unit?

B.    Item 3 is a 25uf 25v capacitor, however the one sent to me was a 22uf
25v, can it be used it instead?

C.    Item 15 is a LM386Z-1.2 transistor, however, the one sent to me was a
LM285Z-1.2, will that pose a problem?

D.    Position C1, C3, and C4 specify a 10uf 25v capacitor (item 1) however
if you look at my photo, C3 and C4 are physically a different shape than C1
but they are 10uf 25v units also. C6 and C16 are suppose to be 10uf 15v
capacitors, however i'm using 10uf 25v units instead (just like C1). The
reason I did this is because the photo of the PCB on the DIY webpage shows
that C3 and C4 are also physically different than C1 so I did the same with
mine. I had three 10uf 25v cylindrical shaped peices and two 10uf 25v ball
shaped pieces. Is this ok?

E.   U1 in my pic is shown with the metal heat sink side facing upwards, is
that correct?

Thanks for your assistance.


Crescent Kao
Director of Marketing and Sales
www.c-speedracing.com

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