******* ERRATA FOR STEAM WHISTLE FOR MODEL BOATS AND TRAINS ***********

Steam Whistle for model boats and trains (June 1996): The value of R4 and 
R5 should be 47k, not 4.7k as shown in the schematic and parts list. 
Note that the whistle may still work with the incorrect values, 
but the oscillators tend to cut out at lower frequencies.