Attached schematic has been updated.

Design is good enough for a bench test of concept, but absolutely not flight worthy !

(will need voltage regulation to protect the 555, EMI filtering not to interfere
with radios, surge protection for those near lighting misses, and short circuit
protection just in case something fails!)

JCP

Thanks John. Care to do the EMI filtering not to interfere
with radios, surge protection for those near lighting misses, and short circuit
protection just in case something fails!.... circuits?

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This is a much better part to use for the leaning device I think.
Instead of an op amp. Last two attachments.

I included

I need to order a couple and fool with them a bit.

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I finally found these guys. Burr Brown was bought out back in
2000 by TI.

DigiKey sells the part as a TI part number. The 8 pin dip is $5.
Well worth it if it is as easy to use as claimed.
It should make a perfect mass airflow sensor output amp.

I'll get one late next week and fool around with it a bit.

I have a hand held aircraft band radio which I can check the interference
if any.

Paul Lamar