This 1967 modeling circuit mimics the whistle of a locomotive. The steam-shrieking wheezing is set in a 2k2 potentiometer.
The Texas Instruments INA826S Instrumentation Amplifier Evaluation Module is available from Mouser...
May 2017 - Mouser Electronics is already in stock with the new BCP1395 transistors from Nexperia....
January 2017 - Mouser Electronics is shipping the new Littlelfuse TVS SP1043, SP1044 and SP1045...