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Can anyone help me find an amplifier that can amplify 22Hz signal which is to be transmitted to a distance of 25m through a copper wounded antenna...I have tried with a voltage (sine wave) of 9V across the antenna . But the required distance cannot be acheived.. I am trying to increase the magnetic strength of the coil by increasing the voltage across the coil, like about 20V across it.. Can anyone help me with this???

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closed as unclear what you're asking by Chris Stratton, Harry Svensson, Bimpelrekkie, Transistor, winny Jan 8 at 8:50

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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    \$\begingroup\$ why are you trying to transmit a 22Hz signal? \$\endgroup\$ – jsotola Jan 8 at 6:52
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    \$\begingroup\$ Even if you'd apply 2000V across the coil I would not expect this to work very well. So you can try to "solve" your problem by increasing the voltage but before you do that you should do some calculations on the antennas to show that the setup can actually work in the first place. \$\endgroup\$ – Bimpelrekkie Jan 8 at 7:27
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    \$\begingroup\$ I, too, question the "22Hz". Do you mean 22 kHz or 22 MHz, perhaps? The wavelength of 22 Hz is over 13,000 kilometers! That'll require an incredibly long (or very tricky) antenna. \$\endgroup\$ – bitsmack Jan 8 at 7:53
  • \$\begingroup\$ Use the electric field between 2 large metal plates, as your 22Hz transmitter. \$\endgroup\$ – analogsystemsrf Jan 8 at 17:19
  • \$\begingroup\$ 22Hz needs to be transmitted since the device is to be used in equipments used for underground applications. High frequency signals cannot be used in such applications. Please see the following link. ncbi.nlm.nih.gov/pmc/articles/PMC4721765 \$\endgroup\$ – febin Jan 10 at 4:09