[Amps] 8877 blower requirement...TXN ! Now..Airflow sensing ?

[Gary Schafer]

I have an amplifier with a vane in it to detect air flow. It operates a
small micro switch and is very sensitive. If you make the arm on the vane
long it gives more torque to operate the switch.

73
Gary  K4FMX

> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of Peter Chadwick
> Sent: Tuesday, April 10, 2007 2:32 AM
> To: amps at contesting.com
> Subject: Re: [Amps] 8877 blower requirement...TXN !  Now..Airflow sensing
> ?
> 
> Peter said:
> > instead using a simple microswitch in the airflow path
> There is nothing as simple and reliable as that.<
> Provided that you can get a big enough vane for the airflow to provide the
> necessary force to operate the microswitch, and the vane doesn't add so
> much resistance to the airflow path that you need a bigger and noisier
> blower. The pressure differential with 1 inch water gauge is roughly
> 3grams/sq.cm, so you need  a very sensitive microswitch. Possibly you
> could make something with a big vane and a reed relay.
> 73
> Peter G3RZP
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