AMRadio receiver circuit diagram sharing based on old single ICMK484

This is the AMRadio receiver circuit diagram based on the old single ICMK484.

Components List:

The MK484 we use is a Japanese copy of the original ZN414. It contains an RF amplifier, active detector, and automatic gain control (AGC to improve sensitivity), all in a 3-pin package. The input impedance is typically 4M ohms. It operates over a frequency range of 150kHz to 3MHz. A DC supply of 1.1V to 1.8V and 0.3mA current draw make it ideal for battery operation. The output is typically an audio signal of 40–60mV. Optimum AGC is provided by R3 and C2 (see Figure 2). R3 (AGC resistor) should be in the range of 100R to 1.5K. A bandwidth of approximately 4kHz is achieved.

Download the MK484 datasheet:

The MK484 is now discontinued. It was made by New Japan Broadcasting, although it does not appear on their website. You can try to find an equivalent IC for the MK484.

Download the full instructions for this AM radio receiver circuit:

NOTE: A kit for this circuit is available from kitsrus.com.