The capacitor value isn’t critical. A lower value will result in faster oscillation and shorter flashes. The 2N2222 NPN transistor seems to work reliably in this circuit. Other transistors may be more temperamental, and others might not work at all.
This is the circuit:
After soldering everything together it should look like this:
And here’s a little video where you can see the Led flashing with a high frequency:
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