Bob Blick ha scritto:
>> Early this morning I've received an Offer by Sensortecnichs -
>> some 90EUR for a 0-5V sensor, capable of 1-2bar and 360 lt/hour.
> 
> That's probably a good choice. It's hard to make an airflow sensor
> measuring low flow rates. Automotive MAF sensors are for hundreds of
> times as much air.

Yeah, I see..


> Back to the one that used two transistors heated to 50C. I built that
> many years ago when it forst appeared, because it was charming. Although
> it does work, plain transistors are awful. There is too much thermal
> mass. It takes a minute to stabilize and response to changing flow rates
> was wobbly.

This is a point indeed. I was planning on using a transistor as well, 
coupled to a tiny SOT23 such as MCP9800. I can't actually think of 
anything "faster" than a transistor to heat up, I mean... a lamp or a 
resistor sounds slower to me...

-- 

Ciao, Dario
--
Cyberdyne
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