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Depends on your requirements.
Military often offers old used antenas of very good quality for radio stations. Of course price depends on dimensions and area of usage.
Guys thanks for the replies.
I have tried all that you adviced but still not working. I have all the time -11.64V at the output.
Is there some other way how to solve this problem ? Like not using op amps but maybe som ic or... whatever. I would be very grateful.
Hi guys.
I´m working on one project to school and i´ve got one big problem.
Usage of this kind of speakers is requested.
**broken link removed**
It is originnaly piezo alarm speaker, i have removed the sin generator.
Then i´ve measured voltage at the output while talking to it from distance...
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