Four Train Sound
This series of kits, known as chip-on-board or COB, have application
specific IC's at the heart. This means that each IC has only one very specific
application, and that it was designed to do that specific job with as few external
components as possible. For example, the CK1203 has a COB that is a CMOS VLSI that makes
four sound effects for the model railroader. (VLSI=very large scale integration) These
COB's are small and should be quite concealable in most applications.
This COB project will produce four very realistic, user selectable sound
effects that are ideal for model railroads. Throw any of four switches to produce: a train
whistle blowing 3 times, a train chugging along, a level crossing bell and the
"Clickety Clack" of a train crossing a bridge. The CK1203 may be cascaded with
one or more additional CK1203's so that one sound ending triggers the next unit for
another sound. Kit includes all parts including speaker. Easy assembly; operates on 2.4 to
6 volts DC.