The speaker used on this circuit is 8 ohms. It produces interval clicks that can be adjusted in C2 and depend on C1. The transistor can be the BC558. L1 consists of 20 turns of wire 28 in a ferrite rod and L2 of 80 to 100 turns of the same wire in the same rod. C2 is a common AM radio variable capacitor. The power can be done with 4 small batteries.
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