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+--- Thread: DIY mech Reefer sound unit circuit (/showthread.php?tid=3601)
DIY mech Reefer sound unit circuit - shortliner - 12-30-2010
In a way back MR there was a circuit for building a battery operated, mech reefer, sound unit. I had a copy but have mislaid it - does anyone happen to have it please?TIA
Re: DIY mech Reefer sound unit circuit - BR60103 - 12-30-2010
Shortliner:
That was in Railroad Model Craftsman. The date must have been around 20 years ago, based on what I was planning to do with it. I do remember it used a 555 chip -- I bought all the parts and they're sitting in a bag.
(Sorry, but I'm now 4 days away from my mags and heading off even farther.)
Re: DIY mech Reefer sound unit circuit - Russ Bellinis - 12-31-2010
Wasn't the 555 chip discontinued since that article appeared?
Re: DIY mech Reefer sound unit circuit - rrinker - 12-31-2010
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
Re: DIY mech Reefer sound unit circuit - ngauger - 12-31-2010
You just BETTER be glad that I never throw anything away!!!!
The only connection I'm not sure of is the "Blue line" connection of the Piezo Speaker (Red dot)
Piezo Element 1500-3000Hz
catalog #: 273-073
TLC555/TLC555CP LinCMOS Timer (8-Pin DIP)
Model: TLC555/TLC555CP Catalog #: 276-1718
0.1µF 50V Hi-Q Ceramic Disc Capacitor Pk/2
Catalog #: 272-135
ALL components were bought at Radio Shack. I think there is a variable resister that is needed, but I'm not sure. This was tossed in the junk box and the speaker was off the board, so i don't know if there is anything else missing, but I think it's complete as is. I ran it with 2 D cells in series
Re: DIY mech Reefer sound unit circuit - shortliner - 01-01-2011
Magic, Mikey - thank you very much. If anyone else has anything further please post
Jack - a great New Year to you all
Re: DIY mech Reefer sound unit circuit - ngauger - 01-01-2011
shortliner Wrote:Magic, Mikey - thank you very much. If anyone else has anything further please postBuild it as shown and let me know if it works
Jack - a great New Year to you all
Re: DIY mech Reefer sound unit circuit - Charlie B - 01-01-2011
I was just doing some surfing and found these. I know they can be found cheaper, but if you were to record the sound, then tell the player to loop, with some speaker additions I can see all kind of possibilities for sound here. Looks like it would easily fit a refer. <!-- m --><a class="postlink" href="http://www.shop4tech.com/item8627.html">http://www.shop4tech.com/item8627.html</a><!-- m -->
Charlie