Very simple, sensitive and high quality AM radio circuit can be make with MK484 monolithic integrated circuit with very few external components.
This MK484 AM radio circuit provides a complete solution including : RF amplifier, Detection and AGC circuit (automatic gain control ), which requires only a few external components to give a high quality AM Tuner.
No setting up or alignment is required and the circuit is completely stable in use.
The circuit has an input impedance of 4Mohms and operates over a frequency range of 150KHz to 3MHz. The IC will run with DC supply between 1.1V and 1.8V typical 1.4V and a current drain of 0.3mA makes it suitable for battery operation.
The output signal is to low to drive a speaker ( typical from 40 to 60 mV ) and is necessary a audio power amplifier .
The coil needs approximately 55 turns of 0.315mm diameter enamelled copper wire on a 100mm long ferrite rod.
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