DIY mech Reefer sound unit circuit
#4
No, you can still get 555 and 556 timers. It was the LM3909 LED flasher that has been discontinued for a few years now. Other methods may give better results than the 555 though, like one of those recordable greeting cards loaded with the actual sound of a reefer mechanical unit.

--Randy
Modeling the Reading Railroad of the 1950's in HO

Visit my web site to see layout progress and other information:
http://www.readingeastpenn.com
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