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The ZN414 IC contains an entire automatic gain controlled AM receiver in a small three pin package. With only a few external components, a simple radio with excellent selection and reception can be constructed. Since the chip also uses a low supply voltage of only 1.3V, 3V coin cell battery can make for a physically small circuit with many covert uses. The chip has a wide bandwidth of between 150KHz and 3MHz, so by playing with values in the tuning circuit you can pick up a wide variety of signals. |
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Another alternative/equivalent to the ZN414/MK484 is the TA7642, but check the pinout as it's different from the other two. | ||
Very nice little radio circuit. I am glad to have an original ZN414 and paperwork to it from 1973! A Quaker Oats can works for the coil. |
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