This 1967 modeling circuit mimics the whistle of a locomotive. The steam-shrieking wheezing is set in a 2k2 potentiometer.
The circuit that gave rise to this configuration was found in a magazine of the 1980s with the...
The HA2620 integrated circuit used in this comparator is from the 80's, but the setting can be...
In the figure we have a good rectangular signals generator with several frequency bands. The...