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Originally Posted by ban
al718 have two switch in circuit why two switch more used, this two switch where is connect
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This circuit is designed to detect a VLF radio signals from a large transmitter.
It cannot detect anything unless there is a transmitter broadcasting at the frequency it is set for.
It is not a practical circuit.
It will not become a practical circuit if you restore it to the original factory new condition.
It stopped being a practical circuit when the transmitters stopped broadcasting at the frequencies it receives.
Most people say it was also not a practical circuit when there were transmitters operating at those frequencies.
Switch near antenna is to set frequency for receiver. Second switch at right side for on-off is to connect power.
Best wishes,
J_P