This circuit using components that are still common in our market was found in a 1987 documentation. L1 consists of 11 turns of 22-wire in the form of 1 cm without a core, while L2 has the same characteristics. The antenna is telescopic and the trimmers make the frequency adjustments for transmission and reception. The LM380 audio amplifier can be replaced with more modern types. It is convenient to power the circuit with 6 small or medium-size batteries because of their consumption. The antenna is 80 cm to 120 cm long.
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