DIY WB Heater Ramp Up at low voltage

[bcroe at juno.com]

That heater will get a big head start, no damage, if 
you turn it on before the motor.  After a minute, it might 
come up operational as soon as the motor starts.

Bruce Roe

On Mon, 25 Mar 2002 14:57:03 -0600 "Perry, Scott" 
<perry at sapphire.spdc.ti.com> writes:
> the DIY WB 
> requires about 14V+ in order to work properly.  At lower voltages, 
> (say ~12.5V) does the heater circuit still attempt to heat the 
> sensor (even though the LED probably won't come on), or does it not 
> function at all?
> 
> The reason I ask is because I'd like to have the sensor start 
> warming up before I actually start the car, but obviously without 
> the engine running, the input voltage is going to be low (in the 
> 12-13V range).  Will the heater still work to some degree at that 
> voltage, or is it an all or nothing deal?

> --Scott
> 

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