Re: (ET) E15 control board #1

["RJ Kanary" <rjkanary nauticom net>]

        Quite frankly......the circuit isn't that sophisticated so the 
component values just aren't critical.Also the 100V caps probably have twice 
their 'rated' capacity at half the voltage.
       Chances are GE or whomever made those controls for them used the 
Price Of The Week to determine what to purchase from where.

----- Original Message ----- 
From: "Rhett T. George" <rtg ee duke edu>
To: <elec-trak cosmos phy tufts edu>
Sent: Sunday, September 17, 2006 11:27 AM
Subject: (ET) E15 control board #1


> - Greetings -
>
> The old control board #1 in the old E15 died.  The large problem is with
> the diodes which seemed to have sniffed too many battery fumes.  The diode
> leads have separated from the semiconductor and in some instances from
> the diode case.  The capacitor would not charge thru an open diode (duh'h)
> so that the SCR could fire.
>
> My question concerns the difference between this early E12 (cast iron
> front axle) and the schematic for the 26AE15 #1 control board.  The board
> I am working on has in locations C104, C104, and C105 50 uF, 50 V caps.
> The schematic shows 1 uF, 100 V caps at those locations.  As this board
> has worked well all these years, I plan not to change them.  My question
> is, "Has anyone come across this discrepancy and resolved it to his/her
> satisfaction?"
>
> Thanks and keep on trackin'
> Rhett
>
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