[Wbo2] LED brighter when sensor not connected?
bcroe at juno.com
bcroe
Wed Sep 28 18:19:41 UTC 2005
For openers, you need the anti oscillation capacitor added to
the circuit.
You need the anti oscillation cap to stabilize the circuit.
That is a 0.01 to 0.1 ufd ceramic added across pins
1 and 3 of D5. There are a few other things that can
be done to improve the dynamic response of the unit,
which tends to overshoot. Bruce Roe
27 Sep 2005 "Ivan\(In\) Choi" <ichoi at telus.net> writes:
> I having problem with heater circuit.
> my low drop regulator was overheating even with good heatsink on.
> so I changed to lm317 and put even bigget heatsink.
>
> now LED comes on and heater voltage stabilizes at 10.4 V.
> but LED is now a little dimmer than when I test with sensor
> disconected.
> is this normal? or I need more voltage?
> 1086 was overheating crazy though it start 4V OK but like a second
> after it stop rising and drops to 1V right away and it's crazy hot..
> BTW I'm using L2H2 sensor.
> either regulator wasn't working without car running so I guess no
> advantage having 1086.
> just dim Led bothers me..
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