@▷ One Chip AM Radio Receiver | Diagram for Schematic

One Chip AM Radio Receiver

Here the AM Radio receiver circuit diagram based on old single IC MK484.

One Chip AM Radio Receiver circuit

Components part list:

R9, R10_________ 6R8
R6_____________ 100R
R3_____________ 1K
R1_____________ 4K7
R7_____________ 5K6
R4_____________ 10K
R2_____________ 100K
R5_____________ 150K
R8_____________ 820K
Pot_____________ 10K log pot
Coil & ferrite bar set
C7______________ 470p ceramic
C, C4, C5, C6_____ 470nF monoblock
C2______________ 100nF monoblock
C3, C8___________ 100uF electrolytic capacitor
VariCap__________ 60/160 AM tuning cap
D1, D2, D3, D4____ 1N4148 diode
Q1, Q3___________ BC548
Q2______________ BC558
IC1_____________ MK484 AM radio IC TO92
Speaker__________ 0.5 or 1W, 8 ohm speaker

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 impedence is typically 4M ohm. It operates over a range of 150kHz to 3MHz. DC supply of 1.1V to 1.8V & 0.3mA current drain makes it ideal for battery operation. The output is typically 40 – 60 mV of audio signal. Optimal AGC is provided by R3 and C2 (see Figure 2). R3 (the AGC resistor) should be in the range 100R to 1.5K. A bandwidth of about 4kHz is achieved.

Download the MK484 data sheet from http://downloads.circuitdiagram.net/dll/b7c67e

The MK484 is now a discontinued IC. It was made by New Japan Radio although it does not appear anywhere on their website(s).

Download the complete explanation of this AM radio receiver circuit HERE

Note: The kit for this circuit is available at kitsrus.com.

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