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Nginuity from the Hacked Gadgets forums made a fun Altoids tin morse code oscillator...
"I finally finished that morse code oscillator I was working on. It works okay for what it is, but I have some serious heat dissipation issues I need to look into for next time. The caps going to ground get real hot if I keep the morse keyer depressed, and, the pitch gets higher as it heats up too. That 500 ohm pot is REAL hot to the touch. I think with beefier components (I was thinking of replacing the ceramic caps with tantalum), and a diode in between pin 7 and pin 2 of the 555 timer, and a zener diode between pin 2, and the 15 K resistor will bring down the heat a bit. The diodes were suggested for a more stable duty cycle anyway. " [via] - Link.
Related:
- Video: Morse coders beating SMSers - Link.
- Morse code - text to MP3 and learn morse code! - Link.
- DIY Morse code Palm keyboard interface board - Link.
- -- --- .-. ... . -... . .- - ... ... -- ... - Link.
- Make Morse Code Music - Link.
- Fun with flashing lights - Link.
- This is not your grandfather's HAM radio... - Link.
- Simple Working Telegraph System - Link.
- HOW TO - Build a computer controlled radio transmitter - Link.
- Mint tin projects... Link.
Just a quick update: The heat was being caused by a short across the Altoids tin. Everything is fine now, I just had to isolate the morse code jack from the tin. Nothing a little hot glue couldnt fix!
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