12-30-2010, 10:14 AM
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
DIY mech Reefer sound unit circuit
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12-30-2010, 10:14 AM
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
12-30-2010, 09:36 PM
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.)
David
Moderato ma non troppo Perth & Exeter Railway Company Esquesing & Chinguacousy Radial Railway In model railroading, there are between six and two hundred ways of performing a given task. Most modellers can get two of them to work.
12-31-2010, 07:59 PM
Wasn't the 555 chip discontinued since that article appeared?
12-31-2010, 08:08 PM
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
12-31-2010, 09:34 PM
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
~~ Mikey KB3VBR (Admin)
~~ NARA Member # 75 ~~ Baldwin Eddystone Unofficial Website ~~ I wonder what that would look like in 1:20.3???
01-01-2011, 05:49 AM
Magic, Mikey - thank you very much. If anyone else has anything further please post
Jack - a great New Year to you all
01-01-2011, 07:27 AM
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
~~ Mikey KB3VBR (Admin)
~~ NARA Member # 75 ~~ Baldwin Eddystone Unofficial Website ~~ I wonder what that would look like in 1:20.3???
01-01-2011, 06:37 PM
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 -->
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