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| 2 Transistor Code Practice OscillatorI first built this simple 2 transistor code practice oscillator when I was a child. I found this schematic on the ARRL website and have reproduced it here for your use...
 Here is an easy shopping list for your local Radio Shack, prices and stock numbers current as of October 2008:
QTY PART RS STOCK NO. PRICE
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1 1K ohm resistor 271-1321 $ 0.99
2 10K ohm resistor 271-1331 $ 0.99
1 47 ohm resistor 271-1105 $ 0.99
1 100 ohm resistor 271-1311 $ 0.99
2 0.01 uF capacitors 272-1065 $ 1.49
2 2N4401 NPN trnasistors 276-2058 $ 1.58
1 8 ohm mini speaker 273-092 $ 2.79 1 9V battery clip 270-325 $ 1.99
1 9B battery 23-875 $ 4.49
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$ 16.30
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Construction Tip:
- This can be a no-solder project laying the parts out on a piece of wood and fastening them together using wood screws. See the finished project on the ARRL site here!
- Why not try a discarded jewel box for a base?
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