555

Mike Halloran
Pembroke Pines, FL, USA

Yep, 555.

For example: http://www.ohmslawcalculator.com/555_astable.php

Another option would be an Arduino or similar uC.

By the way, if you can wait for shipping, you can purchase a 555 circuit board, or several, from eBay for next to nothing.

70Hz - 100Hz is going to need a decent-sized driver housed in a fairly large enclosure to reproduce it. That's way down into the bass frequencies and below what a lot of domestic sound systems can reproduce with any accuracy. Unless this is a _big_ model of a ship you aren't going to have room for any driver capable of reproducing 70Hz. Realistically you're looking at a few hundred Hz, and a ship's hooter is not a pure note so you might want to include a bit of distortion.

Thanks great info. I;m thinking about trying one or twp these mini amps with the tone generator. The model's hull will be fiberglass and about 8'with a 10" beam. That should be big enough to fit thes=audio equipment and everything else. Also, a hull that big will hopefully act like an hollow body guitar. I will look into buying those 555s on ebay.

Jameco Part no. 127255
Manufacturer VELLEMAN INC.
Manufacturer no. K4001
Catalog 142 , page 154
[img http://www.jamec

FYI: The model will be a scratch build of USS Boston CAG-1 @ 1/8' = 1'o.com/Jameco/Products/MakeImag/127255.jpg]

Your tone generator link got mangled: http://www.jameco.com/Jameco/Products/MakeImag/127...

Looks like a proper old-fashioned warship: http://www.vr-24.org/SquadronScrapbook/USS_BostonC... Would be nice to see a photo once you complete it.

Although it's not very patriotic of me to to say so, I think some of the best-looking capital ships were built by Germany during the second world war - Tirpitz, Bismarck, Scharnhorst, Gneisenau.

Yes, the Tirpitz, Bismarck, Scharnhorst,and Gneisenau, had great lines; but I think HMS Hood had more pleasing lines, as did HMS Tiger.

The photo is kind of fuzzy, but this is probably my favorite ship, CB-1 Alaska officially a heavy cruiser, but with 9 12" rifles. 12 5" DPs, and a length of over 800', many consider it Battle Cruiser. I already built her.

I would suggest you use an Arduino 328 MINI. These are only $2.33 shipped to you. This will allow multiple time delays, random operation, lights etc. I was asked to automate this display. I had bind of timers, just make it move and flash a little they said. Buying the first socket for a timer would cost more than a micro. Now it has sound, motion and lights. Random functions mean that you can watch it for 15 minutes before it seems to repeat.

• http://files.engineering.com/getfile.aspx?folder=22c97efa-ef71-40a3-8a03-14

Forgot only one picture at a time. Here is the plane made from DC-8 parts Wingspan is about 100 feet.

• http://files.engineering.com/getfile.aspx?folder=7ab301a8-e0f2-4e41-847a-a6

OperaHouse has a good idea there.
You can certainly get an Arduino up to speed faster and cheaper than you can a homebrew circuit built around a 555.

The Arduino MINI is the size of a postage stamp, so may be difficult to work with, depending on your eyes.
I'd be inclined to try an Arduino Uno instead.

Or maybe a Raspberry PI.

Or any of a thousand tiny computers that have become available in the past decade or so...

Mike Halloran
Pembroke Pines, FL, USA

The MINI is the size of two postage stamps and the pin spacing is exactly the same as a UNO or a 555 chip. You want something small enough to fit in, a UNO is quite large. I remember a Klaxon being unharmonious. I would use TONE function on one pin at an off frequency and the 490hz PWM function on another pin at 50% ANDed to make an unnerving sound. Plenty of pins left to drive LED and motors. On the plane the nacell at the back had red strip LED driven by a random number generator to imitate flames. The sound ws a combination of a jet engine rumble and packman boop bops. The cavernous resonator cavity gave a throaty sound. RANDOM function is great for animation. Let your imagination go wild!