We found this circuit in an article in Electronics Now magazine from November 1997. The circuit uses two transistors to measure the temperature difference between them when one receives the wind.
This simple intercom for home use was found in a 1979 publication. It can be easily mounted with...
This circuit was found in a Popular Electronics from the 90's. The CMOS integrated circuit used is...
This circuit was found in old Maxim documentation. Check the availability of the IC if you are...