[Diy_efi] DIY-WB Heater Ckt Upgrades

[bcroe at juno.com]

As some of you have read, some WB units have an 
instability in the sensor heater ckt, interfering with proper 
or complete warmup.  It was found that a diming LED 
caused by this could be cured by adding a capacitor.  
A 0.1 mfd (like those in the ckt) was simply connected 
to pins 1 and 3 (outside pins) of D5.  There seem to 
be no negatives to this.  

For those with persistant low supply voltage problems, 
I have built a simple circuit that may be added to the 
DIY-WB, 3 connections.  It lowers the required battery 
voltage by 1 volt, to medium 11s.  Philip has posted 
the first drawing of it on his web site, below.

Bruce Roe

(LARGE, 341 KB)
http://www-personal.umich.edu/~gphilip/DIY-WB_Low_Battery_Voltage_Fix.jpg


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