WBO2 testing

[rr]

Sounds like you need some of the 15 ohm resistors across R4.
The current should be ~1.4A max. And yes the VR does run
hot and needs a bit of heat sink.

The LED should light once the heater voltage reaches ~10.4V.
With too low an Imax this will not occur. Once the heater
voltage reaches 10.4V the heater current will taper off to ~1A.

BobR.

Glen Beard wrote:

> OK, I've gotten everything soldered up, and I am testing the
> heater circuit using a tail lamp.  The lamp turns on nice
> and bright building its current to 1.003 Amps.  Is the LED
> supposed to turn on after a while?  Is the LT1086 (VR)
> supposed to get sizzling hot even with a 2x3" Al heat sink?
> With the smaller heat sink I had on it, the bulb would light
> up and then start to dim again.  If I blew across it and it
> got brighter.
>
> --
> Glen Beard  95 T/A conv M6
> 355, Vortech, heads, cam...
> http://home.nycap.rr.com/gbeard1/TransAm.html
> http://home.nycap.rr.com/gbeard1/Impala/Impala.html

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